Index: test/std/containers/associative/map/map.access/iterator.pass.cpp
===================================================================
--- test/std/containers/associative/map/map.access/iterator.pass.cpp
+++ test/std/containers/associative/map/map.access/iterator.pass.cpp
@@ -65,8 +65,8 @@
             V(8, 2)
         };
         std::map<int, double> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::map<int, double>::iterator i;
         i = m.begin();
         std::map<int, double>::const_iterator k = i;
@@ -109,10 +109,10 @@
             V(8, 2)
         };
         const std::map<int, double> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::map<int, double>::const_iterator i;
         i = m.begin();
         for (int j = 1; static_cast<std::size_t>(j) <= m.size(); ++j, ++i)
@@ -152,8 +152,8 @@
             V(8, 2)
         };
         std::map<int, double, std::less<int>, min_allocator<V>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::map<int, double, std::less<int>, min_allocator<V>>::iterator i;
         i = m.begin();
         std::map<int, double, std::less<int>, min_allocator<V>>::const_iterator k = i;
@@ -196,10 +196,10 @@
             V(8, 2)
         };
         const std::map<int, double, std::less<int>, min_allocator<V>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::map<int, double, std::less<int>, min_allocator<V>>::const_iterator i;
         i = m.begin();
         for (int j = 1; static_cast<std::size_t>(j) <= m.size(); ++j, ++i)
Index: test/std/containers/associative/multimap/iterator.pass.cpp
===================================================================
--- test/std/containers/associative/multimap/iterator.pass.cpp
+++ test/std/containers/associative/multimap/iterator.pass.cpp
@@ -28,6 +28,7 @@
 
 #include <map>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -64,8 +65,8 @@
             V(8, 2)
         };
         std::multimap<int, double> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::multimap<int, double>::iterator i;
         i = m.begin();
         std::multimap<int, double>::const_iterator k = i;
@@ -109,10 +110,10 @@
             V(8, 2)
         };
         const std::multimap<int, double> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::multimap<int, double>::const_iterator i;
         i = m.begin();
         for (int j = 1; j <= 8; ++j)
@@ -153,8 +154,8 @@
             V(8, 2)
         };
         std::multimap<int, double, std::less<int>, min_allocator<V>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::multimap<int, double, std::less<int>, min_allocator<V>>::iterator i;
         i = m.begin();
         std::multimap<int, double, std::less<int>, min_allocator<V>>::const_iterator k = i;
@@ -198,10 +199,10 @@
             V(8, 2)
         };
         const std::multimap<int, double, std::less<int>, min_allocator<V>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::multimap<int, double, std::less<int>, min_allocator<V>>::const_iterator i;
         i = m.begin();
         for (int j = 1; j <= 8; ++j)
Index: test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
===================================================================
--- test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
+++ test/std/containers/associative/multiset/insert_initializer_list.pass.cpp
@@ -15,6 +15,7 @@
 
 #include <set>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -27,7 +28,7 @@
     C m = {10, 8};
     m.insert({1, 2, 3, 4, 5, 6});
     assert(m.size() == 8);
-    assert(distance(m.begin(), m.end()) == m.size());
+    assert(static_cast<std::size_t>(distance(m.begin(), m.end())) == m.size());
     C::const_iterator i = m.cbegin();
     assert(*i == V(1));
     assert(*++i == V(2));
@@ -46,7 +47,7 @@
     C m = {10, 8};
     m.insert({1, 2, 3, 4, 5, 6});
     assert(m.size() == 8);
-    assert(distance(m.begin(), m.end()) == m.size());
+    assert(static_cast<std::size_t>(distance(m.begin(), m.end())) == m.size());
     C::const_iterator i = m.cbegin();
     assert(*i == V(1));
     assert(*++i == V(2));
Index: test/std/containers/associative/multiset/iterator.pass.cpp
===================================================================
--- test/std/containers/associative/multiset/iterator.pass.cpp
+++ test/std/containers/associative/multiset/iterator.pass.cpp
@@ -28,6 +28,7 @@
 
 #include <set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -64,8 +65,8 @@
             8
         };
         std::multiset<int> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::multiset<int>::iterator i;
         i = m.begin();
         std::multiset<int>::const_iterator k = i;
@@ -104,10 +105,10 @@
             8
         };
         const std::multiset<int> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::multiset<int>::const_iterator i;
         i = m.begin();
         for (int j = 1; j <= 8; ++j)
@@ -145,8 +146,8 @@
             8
         };
         std::multiset<int, std::less<int>, min_allocator<int>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::multiset<int, std::less<int>, min_allocator<int>>::iterator i;
         i = m.begin();
         std::multiset<int, std::less<int>, min_allocator<int>>::const_iterator k = i;
@@ -185,10 +186,10 @@
             8
         };
         const std::multiset<int, std::less<int>, min_allocator<int>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::multiset<int, std::less<int>, min_allocator<int>>::const_iterator i;
         i = m.begin();
         for (int j = 1; j <= 8; ++j)
Index: test/std/containers/associative/set/insert_initializer_list.pass.cpp
===================================================================
--- test/std/containers/associative/set/insert_initializer_list.pass.cpp
+++ test/std/containers/associative/set/insert_initializer_list.pass.cpp
@@ -15,6 +15,7 @@
 
 #include <set>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -27,7 +28,7 @@
     C m = {10, 8};
     m.insert({1, 2, 3, 4, 5, 6});
     assert(m.size() == 8);
-    assert(distance(m.begin(), m.end()) == m.size());
+    assert(static_cast<std::size_t>(distance(m.begin(), m.end())) == m.size());
     C::const_iterator i = m.cbegin();
     assert(*i == V(1));
     assert(*++i == V(2));
@@ -45,7 +46,7 @@
     C m = {10, 8};
     m.insert({1, 2, 3, 4, 5, 6});
     assert(m.size() == 8);
-    assert(distance(m.begin(), m.end()) == m.size());
+    assert(static_cast<std::size_t>(distance(m.begin(), m.end())) == m.size());
     C::const_iterator i = m.cbegin();
     assert(*i == V(1));
     assert(*++i == V(2));
Index: test/std/containers/associative/set/iterator.pass.cpp
===================================================================
--- test/std/containers/associative/set/iterator.pass.cpp
+++ test/std/containers/associative/set/iterator.pass.cpp
@@ -65,8 +65,8 @@
             8
         };
         std::set<int> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::set<int>::iterator i;
         i = m.begin();
         std::set<int>::const_iterator k = i;
@@ -104,10 +104,10 @@
             8
         };
         const std::set<int> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::set<int>::const_iterator i;
         i = m.begin();
         for (int j = 1; static_cast<std::size_t>(j) <= m.size(); ++j, ++i)
@@ -144,8 +144,8 @@
             8
         };
         std::set<int, std::less<int>, min_allocator<int>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
         std::set<int, std::less<int>, min_allocator<int>>::iterator i;
         i = m.begin();
         std::set<int, std::less<int>, min_allocator<int>>::const_iterator k = i;
@@ -183,10 +183,10 @@
             8
         };
         const std::set<int, std::less<int>, min_allocator<int>> m(ar, ar+sizeof(ar)/sizeof(ar[0]));
-        assert(std::distance(m.begin(), m.end()) == m.size());
-        assert(std::distance(m.cbegin(), m.cend()) == m.size());
-        assert(std::distance(m.rbegin(), m.rend()) == m.size());
-        assert(std::distance(m.crbegin(), m.crend()) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.begin(), m.end())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.cbegin(), m.cend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.rbegin(), m.rend())) == m.size());
+        assert(static_cast<std::size_t>(std::distance(m.crbegin(), m.crend())) == m.size());
         std::set<int, std::less<int>, min_allocator<int>>::const_iterator i;
         i = m.begin();
         for (int j = 1; static_cast<std::size_t>(j) <= m.size(); ++j, ++i)
Index: test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
+++ test/std/containers/sequences/deque/deque.capacity/resize_size.pass.cpp
@@ -50,7 +50,7 @@
     typename C::size_type c1_osize = c1.size();
     c1.resize(size);
     assert(c1.size() == size);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     CI i = c1.begin();
     for (int j = 0; static_cast<std::size_t>(j) < std::min(c1_osize, c1.size()); ++j, ++i)
         assert(*i == j);
Index: test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
+++ test/std/containers/sequences/deque/deque.capacity/resize_size_value.pass.cpp
@@ -50,7 +50,7 @@
     typename C::size_type c1_osize = c1.size();
     c1.resize(size, x);
     assert(c1.size() == size);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     CI i = c1.begin();
     for (int j = 0; static_cast<std::size_t>(j) < std::min(c1_osize, c1.size()); ++j, ++i)
         assert(*i == j);
Index: test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/assign_iter_iter.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -46,7 +47,7 @@
 test(C& c1, const C& c2)
 {
     c1.assign(c2.begin(), c2.end());
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     assert(c1 == c2);
 }
 
@@ -66,7 +67,7 @@
     typedef typename C::const_iterator CI;
     typedef input_iterator<CI> ICI;
     c1.assign(ICI(c2.begin()), ICI(c2.end()));
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     assert(c1 == c2);
 }
 
Index: test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/assign_size_value.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -47,7 +48,7 @@
     typedef typename C::const_iterator CI;
     c1.assign(size, v);
     assert(c1.size() == size);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     for (CI i = c1.begin(); i != c1.end(); ++i)
         assert(*i == v);
 }
Index: test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/iter_iter.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_allocator.h"
 #include "test_iterators.h"
@@ -27,8 +28,8 @@
     typedef std::deque<T, Allocator> C;
     typedef typename C::const_iterator const_iterator;
     C d(f, l);
-    assert(d.size() == std::distance(f, l));
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(d.size() == static_cast<std::size_t>(std::distance(f, l)));
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i, ++f)
         assert(*i == *f);
 }
@@ -41,8 +42,8 @@
     typedef std::deque<T, Allocator> C;
     typedef typename C::const_iterator const_iterator;
     C d(f, l);
-    assert(d.size() == std::distance(f, l));
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(d.size() == static_cast<std::size_t>(std::distance(f, l)));
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i, ++f)
         assert(*i == *f);
 }
Index: test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/iter_iter_alloc.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_iterators.h"
 #include "test_allocator.h"
@@ -28,8 +29,8 @@
     typedef typename C::const_iterator const_iterator;
     C d(f, l, a);
     assert(d.get_allocator() == a);
-    assert(d.size() == std::distance(f, l));
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(d.size() == static_cast<std::size_t>(std::distance(f, l)));
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i, ++f)
         assert(*i == *f);
 }
Index: test/std/containers/sequences/deque/deque.cons/size.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/size.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/size.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_allocator.h"
@@ -31,7 +32,7 @@
     C d(n, Allocator());
     assert(DefaultOnly::count == n);
     assert(d.size() == n);
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i)
         assert(*i == T());
@@ -52,7 +53,7 @@
     C d(n);
     assert(DefaultOnly::count == n);
     assert(d.size() == n);
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i)
         assert(*i == T());
Index: test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/size_value.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "test_allocator.h"
 #include "min_allocator.h"
@@ -25,7 +26,7 @@
     typedef typename C::const_iterator const_iterator;
     C d(n, x);
     assert(d.size() == n);
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i)
         assert(*i == x);
 }
Index: test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
+++ test/std/containers/sequences/deque/deque.cons/size_value_alloc.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -25,7 +26,7 @@
     C d(n, x, a);
     assert(d.get_allocator() == a);
     assert(d.size() == n);
-    assert(distance(d.begin(), d.end()) == d.size());
+    assert(static_cast<std::size_t>(distance(d.begin(), d.end())) == d.size());
     for (const_iterator i = d.begin(), e = d.end(); i != e; ++i)
         assert(*i == x);
 }
Index: test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/emplace.pass.cpp
@@ -15,6 +15,7 @@
 
 #include <deque>
 #include <cassert>
+#include <cstddef>
 
 #include "../../../Emplaceable.h"
 #include "min_allocator.h"
@@ -51,7 +52,7 @@
     CI i = c1.emplace(c1.begin() + P, Emplaceable(1, 2.5));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     assert(*i == Emplaceable(1, 2.5));
 }
 
Index: test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/erase_iter.pass.cpp
@@ -51,7 +51,7 @@
     I i = c1.erase(c1.cbegin() + P);
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize - 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     int j = 0;
     for (; j < P; ++j, ++i)
Index: test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/erase_iter_iter.pass.cpp
@@ -53,7 +53,7 @@
     I i = c1.erase(c1.cbegin() + P, c1.cbegin() + (P + size));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize - size);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     int j = 0;
     for (; j < P; ++j, ++i)
Index: test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
@@ -58,7 +58,7 @@
     CI i = c1.insert(c1.begin() + P, BCI(c2.begin()), BCI(c2.end()));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + c2.size());
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
@@ -75,7 +75,7 @@
     CI i = c1.insert(c1.begin() + P, BCI(c2.begin()), BCI(c2.end()));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + c2.size());
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
@@ -92,7 +92,7 @@
     CI i = c1.insert(c1.begin() + P, BCI(c2.begin()), BCI(c2.end()));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + c2.size());
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
@@ -173,7 +173,7 @@
     CI i = c1.insert(c1.begin() + P, ICI(c2.begin()), ICI(c2.end()));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + c2.size());
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
Index: test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/insert_rvalue.pass.cpp
@@ -52,7 +52,7 @@
     CI i = c1.insert(c1.begin() + P, MoveOnly(x));
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == MoveOnly(j));
Index: test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/insert_size_value.pass.cpp
@@ -51,7 +51,7 @@
     CI i = c1.insert(c1.begin() + P, size, x);
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + size);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
@@ -121,7 +121,7 @@
             CI jt = c.cbegin() + j;
             c.insert(it, 5, *jt);
             assert(c.size() == 25);
-            assert(distance(c.begin(), c.end()) == c.size());
+            assert(static_cast<std::size_t>(distance(c.begin(), c.end())) == c.size());
             it = c.cbegin();
             for (int k = 0; k < i; ++k, ++it)
                 assert(*it == k);
Index: test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/insert_value.pass.cpp
@@ -49,7 +49,7 @@
     CI i = c1.insert(c1.begin() + P, x);
     assert(i == c1.begin() + P);
     assert(c1.size() == c1_osize + 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     i = c1.begin();
     for (int j = 0; j < P; ++j, ++i)
         assert(*i == j);
@@ -103,7 +103,7 @@
             CI jt = c.cbegin() + j;
             c.insert(it, *jt);
             assert(c.size() == 21);
-            assert(distance(c.begin(), c.end()) == c.size());
+            assert(static_cast<std::size_t>(distance(c.begin(), c.end())) == c.size());
             it = c.cbegin();
             for (int k = 0; k < i; ++k, ++it)
                 assert(*it == k);
Index: test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/pop_back.pass.cpp
@@ -47,7 +47,7 @@
     std::size_t c1_osize = c1.size();
     c1.pop_back();
     assert(c1.size() == c1_osize - 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     I i = c1.begin();
     for (int j = 0; static_cast<std::size_t>(j) < c1.size(); ++j, ++i)
         assert(*i == j);
Index: test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/pop_front.pass.cpp
@@ -47,7 +47,7 @@
     std::size_t c1_osize = c1.size();
     c1.pop_front();
     assert(c1.size() == c1_osize - 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     I i = c1.begin();
     for (int j = 1; static_cast<std::size_t>(j) < c1.size(); ++j, ++i)
         assert(*i == j);
Index: test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/push_front.pass.cpp
@@ -47,7 +47,7 @@
     std::size_t c1_osize = c1.size();
     c1.push_front(x);
     assert(c1.size() == c1_osize + 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     I i = c1.begin();
     assert(*i == x);
     ++i;
Index: test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
===================================================================
--- test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
+++ test/std/containers/sequences/deque/deque.modifiers/push_front_rvalue.pass.cpp
@@ -50,7 +50,7 @@
     std::size_t c1_osize = c1.size();
     c1.push_front(MoveOnly(x));
     assert(c1.size() == c1_osize + 1);
-    assert(distance(c1.begin(), c1.end()) == c1.size());
+    assert(static_cast<std::size_t>(distance(c1.begin(), c1.end())) == c1.size());
     I i = c1.begin();
     assert(*i == MoveOnly(x));
     ++i;
Index: test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
+++ test/std/containers/sequences/vector.bool/construct_iter_iter.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <vector>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -25,7 +26,7 @@
 {
     C c(first, last);
     LIBCPP_ASSERT(c.__invariants());
-    assert(c.size() == std::distance(first, last));
+    assert(c.size() == static_cast<std::size_t>(std::distance(first, last)));
     for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i, ++first)
         assert(*i == *first);
 }
Index: test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
===================================================================
--- test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
+++ test/std/containers/sequences/vector.bool/construct_iter_iter_alloc.pass.cpp
@@ -15,6 +15,7 @@
 
 #include <vector>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -26,7 +27,7 @@
 {
     C c(first, last, a);
     LIBCPP_ASSERT(c.__invariants());
-    assert(c.size() == std::distance(first, last));
+    assert(c.size() == static_cast<std::size_t>(std::distance(first, last)));
     for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i, ++first)
         assert(*i == *first);
 }
Index: test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
===================================================================
--- test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
+++ test/std/containers/sequences/vector/vector.cons/construct_iter_iter.pass.cpp
@@ -13,6 +13,7 @@
 
 #include <vector>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -26,7 +27,7 @@
 {
     C c(first, last);
     LIBCPP_ASSERT(c.__invariants());
-    assert(c.size() == std::distance(first, last));
+    assert(c.size() == static_cast<std::size_t>(std::distance(first, last)));
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
     for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i, ++first)
         assert(*i == *first);
Index: test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
===================================================================
--- test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
+++ test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <vector>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -27,7 +28,7 @@
 {
     C c(first, last, a);
     LIBCPP_ASSERT(c.__invariants());
-    assert(c.size() == std::distance(first, last));
+    assert(c.size() == static_cast<std::size_t>(std::distance(first, last)));
     LIBCPP_ASSERT(is_contiguous_container_asan_correct(c));
     for (typename C::const_iterator i = c.cbegin(), e = c.cend(); i != e; ++i, ++first)
         assert(*i == *first);
Index: test/std/containers/unord/unord.map/iterators.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/iterators.pass.cpp
+++ test/std/containers/unord/unord.map/iterators.pass.cpp
@@ -23,6 +23,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -44,8 +45,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -63,8 +64,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #if TEST_STD_VER >= 11
@@ -84,8 +85,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -104,8 +105,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #endif
Index: test/std/containers/unord/unord.map/swap_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/swap_member.pass.cpp
+++ test/std/containers/unord/unord.map/swap_member.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "../../test_compare.h"
 #include "../../test_hash.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -222,8 +223,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -231,8 +232,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -270,8 +271,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -279,8 +280,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -308,8 +309,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -321,8 +322,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -369,8 +370,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -382,8 +383,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -402,8 +403,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -411,8 +412,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -450,8 +451,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -459,8 +460,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -488,8 +489,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -501,8 +502,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -549,8 +550,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -562,8 +563,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/assign_copy.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -68,8 +69,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -131,8 +132,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -177,8 +178,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/assign_init.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -54,8 +55,8 @@
         assert(c.at(2) == "two");
         assert(c.at(3) == "three");
         assert(c.at(4) == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -87,8 +88,8 @@
         assert(c.at(2) == "two");
         assert(c.at(3) == "three");
         assert(c.at(4) == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/assign_move.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -69,8 +70,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -114,8 +115,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c0.size() == 0);
@@ -160,8 +161,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c0.size() == 0);
@@ -207,8 +208,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c0.size() == 0);
Index: test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/copy.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -63,8 +64,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -103,8 +104,8 @@
         assert(c.get_allocator() ==
                (other_allocator<std::pair<const int, std::string> >(-2)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -142,8 +143,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/copy_alloc.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -63,8 +64,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(5)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -103,8 +104,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -142,8 +143,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/init.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -55,8 +56,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -87,8 +88,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -119,8 +120,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == a);
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -152,8 +153,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == a);
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/init_size.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -58,8 +59,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -92,8 +93,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -59,8 +60,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -94,8 +95,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -61,8 +62,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -97,8 +98,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -62,8 +63,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -99,8 +100,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -135,8 +136,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/move.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -50,8 +51,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -91,8 +92,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -117,8 +118,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -158,8 +159,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/move_alloc.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -64,8 +65,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(12));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -105,8 +106,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -147,8 +148,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -188,8 +189,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/range.pass.cpp
@@ -20,6 +20,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -59,8 +60,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -93,8 +94,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -126,8 +127,8 @@
         assert(c.key_eq() == Comp());
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -161,8 +162,8 @@
         assert(c.key_eq() == Comp());
         assert(c.get_allocator() == a);
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/range_size.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -62,8 +63,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -98,8 +99,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -64,8 +65,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -101,8 +102,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -65,8 +66,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -103,8 +104,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -23,6 +23,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -67,8 +68,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -106,8 +107,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -144,8 +145,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
+++ test/std/containers/unord/unord.map/unord.map.swap/swap_non_member.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -222,8 +223,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -231,8 +232,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -270,8 +271,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -279,8 +280,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -308,8 +309,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -321,8 +322,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -369,8 +370,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -382,8 +383,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -402,8 +403,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -411,8 +412,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -450,8 +451,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -459,8 +460,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -488,8 +489,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -501,8 +502,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -549,8 +550,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -562,8 +563,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.multimap/iterators.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/iterators.pass.cpp
+++ test/std/containers/unord/unord.multimap/iterators.pass.cpp
@@ -23,6 +23,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -44,8 +45,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
         i = c.begin();
         i->second = "ONE";
@@ -66,8 +67,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #if TEST_STD_VER >= 11
@@ -87,8 +88,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
         i = c.begin();
         i->second = "ONE";
@@ -110,8 +111,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #endif
Index: test/std/containers/unord/unord.multimap/rehash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/rehash.pass.cpp
+++ test/std/containers/unord/unord.multimap/rehash.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -62,8 +63,8 @@
     i = eq.first;
     assert(i->first == 4);
     assert(i->second == "four");
-    assert(std::distance(c.begin(), c.end()) == c.size());
-    assert(std::distance(c.cbegin(), c.cend()) == c.size());
+    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
 }
 
Index: test/std/containers/unord/unord.multimap/swap_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/swap_member.pass.cpp
+++ test/std/containers/unord/unord.multimap/swap_member.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../test_compare.h"
@@ -44,8 +45,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -53,8 +54,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -92,8 +93,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -101,8 +102,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -130,8 +131,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -145,8 +146,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -193,8 +194,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -208,8 +209,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -229,8 +230,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -238,8 +239,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -277,8 +278,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -286,8 +287,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -315,8 +316,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -330,8 +331,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -378,8 +379,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -393,8 +394,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -414,8 +415,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -423,8 +424,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -462,8 +463,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -471,8 +472,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -500,8 +501,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -515,8 +516,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -563,8 +564,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -578,8 +579,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_copy.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -82,8 +83,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -159,8 +160,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -219,8 +220,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_init.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -79,8 +80,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -136,8 +137,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/assign_move.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -89,8 +90,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -154,8 +155,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -219,8 +220,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -285,8 +286,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -77,8 +78,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -131,8 +132,8 @@
         assert(c.get_allocator() ==
                (other_allocator<std::pair<const int, std::string> >(-2)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -184,8 +185,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/copy_alloc.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -77,8 +78,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(5)));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -131,8 +132,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -184,8 +185,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A{});
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init.pass.cpp
@@ -19,6 +19,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -74,8 +75,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -128,8 +129,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -183,8 +184,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == HF());
@@ -239,8 +240,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == hf);
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -77,8 +78,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -133,8 +134,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -78,8 +79,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -135,8 +136,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -80,8 +81,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -138,8 +139,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -81,8 +82,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -140,8 +141,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -199,8 +200,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -59,8 +60,8 @@
         assert(c.get_allocator() ==
                (test_allocator<std::pair<const int, std::string> >(10)));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -119,8 +120,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -159,8 +160,8 @@
         assert(c.get_allocator() ==
                (min_allocator<std::pair<const int, std::string> >()));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -219,8 +220,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/move_alloc.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -86,8 +87,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -150,8 +151,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -215,8 +216,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -279,8 +280,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range.pass.cpp
@@ -20,6 +20,7 @@
 #include <string>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -78,8 +79,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -134,8 +135,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -191,8 +192,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == HF());
@@ -249,8 +250,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == hf);
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -81,8 +82,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
@@ -139,8 +140,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >());
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -83,8 +84,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -142,8 +143,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -84,8 +85,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -144,8 +145,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -23,6 +23,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -86,8 +87,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -147,8 +148,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
@@ -208,8 +209,8 @@
         i = eq.first;
         assert(i->first == 4);
         assert(i->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
         assert(c.hash_function() == test_hash<std::hash<int> >(8));
Index: test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_const_iter.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -73,8 +74,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #if TEST_STD_VER >= 11
     {
@@ -119,8 +120,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #endif
 #if TEST_STD_VER >= 14
Index: test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_key.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -81,8 +82,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(2) == 2);
         assert(c.size() == 4);
@@ -104,8 +105,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(2) == 0);
         assert(c.size() == 4);
@@ -127,8 +128,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(4) == 1);
         assert(c.size() == 3);
@@ -145,8 +146,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(4) == 0);
         assert(c.size() == 3);
@@ -163,8 +164,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(1) == 2);
         assert(c.size() == 1);
@@ -173,8 +174,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(1) == 0);
         assert(c.size() == 1);
@@ -183,22 +184,22 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(3) == 1);
         assert(c.size() == 0);
         eq = c.equal_range(3);
         assert(std::distance(eq.first, eq.second) == 0);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(3) == 0);
         assert(c.size() == 0);
         eq = c.equal_range(3);
         assert(std::distance(eq.first, eq.second) == 0);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #if TEST_STD_VER >= 11
     {
@@ -244,8 +245,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(2) == 2);
         assert(c.size() == 4);
@@ -267,8 +268,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(2) == 0);
         assert(c.size() == 4);
@@ -290,8 +291,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(4) == 1);
         assert(c.size() == 3);
@@ -308,8 +309,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(4) == 0);
         assert(c.size() == 3);
@@ -326,8 +327,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(1) == 2);
         assert(c.size() == 1);
@@ -336,8 +337,8 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(1) == 0);
         assert(c.size() == 1);
@@ -346,22 +347,22 @@
         k = eq.first;
         assert(k->first == 3);
         assert(k->second == "three");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(3) == 1);
         assert(c.size() == 0);
         eq = c.equal_range(3);
         assert(std::distance(eq.first, eq.second) == 0);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         assert(c.erase(3) == 0);
         assert(c.size() == 0);
         eq = c.equal_range(3);
         assert(std::distance(eq.first, eq.second) == 0);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
     {
     typedef std::unordered_multimap<int, int> C;
Index: test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.modifiers/erase_range.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "min_allocator.h"
 
@@ -68,8 +69,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         k = c.erase(i, j);
         assert(c.size() == 4);
@@ -91,8 +92,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         k = c.erase(c.cbegin(), c.cend());
         assert(c.size() == 0);
@@ -145,8 +146,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         k = c.erase(i, j);
         assert(c.size() == 4);
@@ -168,8 +169,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
 
         k = c.erase(c.cbegin(), c.cend());
         assert(c.size() == 0);
Index: test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_init.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_iterators.h"
 #include "min_allocator.h"
@@ -67,8 +68,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #if TEST_STD_VER >= 11
     {
@@ -114,8 +115,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #endif
 #endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
Index: test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.modifiers/insert_range.pass.cpp
@@ -19,6 +19,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_iterators.h"
 #include "min_allocator.h"
@@ -67,8 +68,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #if TEST_STD_VER >= 11
     {
@@ -114,8 +115,8 @@
         k = eq.first;
         assert(k->first == 4);
         assert(k->second == "four");
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
     }
 #endif
 }
Index: test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
+++ test/std/containers/unord/unord.multimap/unord.multimap.swap/swap_non_member.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_map>
 #include <string>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -43,8 +44,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -52,8 +53,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -91,8 +92,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -100,8 +101,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -129,8 +130,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -144,8 +145,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -192,8 +193,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -207,8 +208,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -228,8 +229,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -237,8 +238,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -276,8 +277,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -285,8 +286,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -314,8 +315,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -329,8 +330,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -377,8 +378,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -392,8 +393,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -413,8 +414,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -422,8 +423,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -461,8 +462,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -470,8 +471,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -499,8 +500,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -514,8 +515,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -562,8 +563,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -577,8 +578,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.multiset/iterators.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/iterators.pass.cpp
+++ test/std/containers/unord/unord.multiset/iterators.pass.cpp
@@ -22,6 +22,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -43,8 +44,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -62,8 +63,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #if TEST_STD_VER >= 11
@@ -83,8 +84,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -103,8 +104,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 7);
         assert(c.size() == 6);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #endif
Index: test/std/containers/unord/unord.multiset/swap_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/swap_member.pass.cpp
+++ test/std/containers/unord/unord.multiset/swap_member.pass.cpp
@@ -17,6 +17,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../test_compare.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -223,8 +224,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -232,8 +233,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -271,8 +272,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -280,8 +281,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -309,8 +310,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -322,8 +323,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -370,8 +371,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -383,8 +384,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -404,8 +405,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -413,8 +414,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -452,8 +453,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -461,8 +462,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -490,8 +491,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -503,8 +504,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -551,8 +552,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -564,8 +565,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_copy.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -75,8 +76,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -147,8 +148,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -201,8 +202,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_init.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -54,8 +55,8 @@
         assert(c.count(2) == 2);
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -87,8 +88,8 @@
         assert(c.count(2) == 2);
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/assign_move.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -76,8 +77,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -121,8 +122,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -166,8 +167,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -212,8 +213,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -257,8 +258,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -69,8 +70,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -116,8 +117,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == other_allocator<int>(-2));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -162,8 +163,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/copy_alloc.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -69,8 +70,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(5));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -116,8 +117,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -53,8 +54,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -84,8 +85,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -118,8 +119,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -153,8 +154,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -56,8 +57,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -89,8 +90,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -58,8 +59,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -92,8 +93,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -59,8 +60,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -94,8 +95,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -60,8 +61,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -96,8 +97,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -57,8 +58,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -97,8 +98,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -133,8 +134,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -173,8 +174,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/move_alloc.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -71,8 +72,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(12));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -112,8 +113,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -154,8 +155,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -195,8 +196,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range.pass.cpp
@@ -19,6 +19,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -56,8 +57,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -89,8 +90,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -123,8 +124,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -158,8 +159,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -59,8 +60,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -94,8 +95,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -61,8 +62,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -97,8 +98,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -62,8 +63,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -99,8 +100,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -64,8 +65,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -102,8 +103,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
+++ test/std/containers/unord/unord.multiset/unord.multiset.swap/swap_non_member.pass.cpp
@@ -17,6 +17,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -223,8 +224,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -232,8 +233,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -271,8 +272,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -280,8 +281,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -309,8 +310,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -322,8 +323,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -370,8 +371,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -383,8 +384,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -404,8 +405,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -413,8 +414,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -452,8 +453,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -461,8 +462,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -490,8 +491,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -503,8 +504,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -551,8 +552,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 6);
@@ -564,8 +565,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.set/iterators.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/iterators.pass.cpp
+++ test/std/containers/unord/unord.set/iterators.pass.cpp
@@ -22,6 +22,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -43,8 +44,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -62,8 +63,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #if TEST_STD_VER >= 11
@@ -83,8 +84,8 @@
         C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::iterator i;
     }
     {
@@ -103,8 +104,8 @@
         const C c(a, a + sizeof(a)/sizeof(a[0]));
         assert(c.bucket_count() >= 5);
         assert(c.size() == 4);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         C::const_iterator i;
     }
 #endif
Index: test/std/containers/unord/unord.set/swap_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/swap_member.pass.cpp
+++ test/std/containers/unord/unord.set/swap_member.pass.cpp
@@ -17,6 +17,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../test_compare.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -223,8 +224,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -232,8 +233,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -271,8 +272,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -280,8 +281,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -309,8 +310,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -322,8 +323,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -370,8 +371,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -383,8 +384,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -404,8 +405,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -413,8 +414,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -452,8 +453,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -461,8 +462,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -490,8 +491,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -503,8 +504,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -551,8 +552,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -564,8 +565,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/assign_copy.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -67,8 +68,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -130,8 +131,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -176,8 +177,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/assign_init.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -54,8 +55,8 @@
         assert(c.count(2) == 1);
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -87,8 +88,8 @@
         assert(c.count(2) == 1);
         assert(c.count(3) == 1);
         assert(c.count(4) == 1);
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/assign_move.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -68,8 +69,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(4));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -113,8 +114,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -158,8 +159,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -204,8 +205,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/copy.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -61,8 +62,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -100,8 +101,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == other_allocator<int>(-2));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -138,8 +139,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/copy_alloc.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -61,8 +62,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(5));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -100,8 +101,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/init.pass.cpp
@@ -18,6 +18,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -53,8 +54,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -84,8 +85,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -118,8 +119,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -153,8 +154,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/init_size.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -56,8 +57,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -89,8 +90,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -58,8 +59,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -92,8 +93,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -59,8 +60,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -94,8 +95,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/init_size_hash_equal_allocator.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -60,8 +61,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -96,8 +97,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -57,8 +58,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -97,8 +98,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -133,8 +134,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(c.load_factor() == 0);
         assert(c.max_load_factor() == 1);
 
@@ -173,8 +174,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/move_alloc.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "../../../test_compare.h"
 #include "../../../test_hash.h"
@@ -62,8 +63,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(12));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -103,8 +104,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
@@ -145,8 +146,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == A());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
 
Index: test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/range.pass.cpp
@@ -19,6 +19,7 @@
 #include <unordered_set>
 #include <cassert>
 #include <cfloat>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -56,8 +57,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -89,8 +90,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -123,8 +124,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -158,8 +159,8 @@
         assert(c.get_allocator() == a);
         assert(!(c.get_allocator() == A()));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/range_size.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -59,8 +60,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -94,8 +95,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -61,8 +62,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -97,8 +98,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >());
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -62,8 +63,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -99,8 +100,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.cnstr/range_size_hash_equal_allocator.pass.cpp
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cfloat>
 #include <cmath>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_iterators.h"
@@ -64,8 +65,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == test_allocator<int>(10));
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
@@ -102,8 +103,8 @@
         assert(c.key_eq() == test_compare<std::equal_to<int> >(9));
         assert(c.get_allocator() == min_allocator<int>());
         assert(!c.empty());
-        assert(std::distance(c.begin(), c.end()) == c.size());
-        assert(std::distance(c.cbegin(), c.cend()) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
+        assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
         assert(std::fabs(c.load_factor() - (float)c.size()/c.bucket_count()) < FLT_EPSILON);
         assert(c.max_load_factor() == 1);
     }
Index: test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
===================================================================
--- test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
+++ test/std/containers/unord/unord.set/unord.set.swap/swap_non_member.pass.cpp
@@ -17,6 +17,7 @@
 
 #include <unordered_set>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "../../../test_compare.h"
@@ -42,8 +43,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -51,8 +52,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -90,8 +91,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -99,8 +100,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -128,8 +129,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -141,8 +142,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -189,8 +190,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(3));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -202,8 +203,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(3));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 
@@ -223,8 +224,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -232,8 +233,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -271,8 +272,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -280,8 +281,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -309,8 +310,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -322,8 +323,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -370,8 +371,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc(2));
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -383,8 +384,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc(1));
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #if TEST_STD_VER >= 11
@@ -404,8 +405,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -413,8 +414,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -452,8 +453,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         LIBCPP_ASSERT(c2.bucket_count() == 0);
@@ -461,8 +462,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -490,8 +491,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -503,8 +504,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
     {
@@ -551,8 +552,8 @@
         assert(c1.hash_function() == Hash(2));
         assert(c1.key_eq() == Compare(2));
         assert(c1.get_allocator() == Alloc());
-        assert(std::distance(c1.begin(), c1.end()) == c1.size());
-        assert(std::distance(c1.cbegin(), c1.cend()) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.begin(), c1.end())) == c1.size());
+        assert(static_cast<std::size_t>(std::distance(c1.cbegin(), c1.cend())) == c1.size());
         assert(c1.max_load_factor() == 2);
 
         assert(c2.bucket_count() >= 4);
@@ -564,8 +565,8 @@
         assert(c2.hash_function() == Hash(1));
         assert(c2.key_eq() == Compare(1));
         assert(c2.get_allocator() == Alloc());
-        assert(std::distance(c2.begin(), c2.end()) == c2.size());
-        assert(std::distance(c2.cbegin(), c2.cend()) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.begin(), c2.end())) == c2.size());
+        assert(static_cast<std::size_t>(std::distance(c2.cbegin(), c2.cend())) == c2.size());
         assert(c2.max_load_factor() == 1);
     }
 #endif
Index: test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
===================================================================
--- test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
+++ test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
@@ -16,6 +16,7 @@
 #include <string>
 #include <iterator>
 #include <cassert>
+#include <cstddef>
 
 #include "test_macros.h"
 #include "test_allocator.h"
@@ -32,7 +33,7 @@
     typedef typename S::allocator_type A;
     S s2(first, last);
     LIBCPP_ASSERT(s2.__invariants());
-    assert(s2.size() == std::distance(first, last));
+    assert(s2.size() == static_cast<std::size_t>(std::distance(first, last)));
     unsigned i = 0;
     for (It it = first; it != last; ++it, ++i)
         assert(s2[i] == *it);
@@ -49,7 +50,7 @@
     typedef typename S::traits_type T;
     S s2(first, last, a);
     LIBCPP_ASSERT(s2.__invariants());
-    assert(s2.size() == std::distance(first, last));
+    assert(s2.size() == static_cast<std::size_t>(std::distance(first, last)));
     unsigned i = 0;
     for (It it = first; it != last; ++it, ++i)
         assert(s2[i] == *it);