Index: include/iterator
===================================================================
--- include/iterator
+++ include/iterator
@@ -219,61 +219,64 @@
     typedef typename iterator_traits<Iterator>::iterator_category iterator_category;
     typedef value_type&&                                          reference;
  
-    move_iterator();
-    explicit move_iterator(Iterator i);
-    template <class U> move_iterator(const move_iterator<U>& u);
-    template <class U> move_iterator& operator=(const move_iterator<U>& u);
-    iterator_type base() const;
-    reference operator*() const;
-    pointer operator->() const;
-    move_iterator& operator++();
-    move_iterator operator++(int);
-    move_iterator& operator--();
-    move_iterator operator--(int);
-    move_iterator operator+(difference_type n) const; 
-    move_iterator& operator+=(difference_type n); 
-    move_iterator operator-(difference_type n) const; 
-    move_iterator& operator-=(difference_type n); 
-    unspecified operator[](difference_type n) const;
+    constexpr move_iterator();  // all the constexprs are in C++17
+    constexpr explicit move_iterator(Iterator i);
+    template <class U>
+      constexpr move_iterator(const move_iterator<U>& u);
+    template <class U>
+      constexpr move_iterator& operator=(const move_iterator<U>& u);
+    constexpr iterator_type base() const;
+    constexpr reference operator*() const;
+    constexpr pointer operator->() const;
+    constexpr move_iterator& operator++();
+    constexpr move_iterator operator++(int);
+    constexpr move_iterator& operator--();
+    constexpr move_iterator operator--(int);
+    constexpr move_iterator operator+(difference_type n) const; 
+    constexpr move_iterator& operator+=(difference_type n); 
+    constexpr move_iterator operator-(difference_type n) const; 
+    constexpr move_iterator& operator-=(difference_type n); 
+    constexpr unspecified operator[](difference_type n) const;
 private:
     Iterator current; // exposition only
 };
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-bool
+constexpr bool   // constexpr in C++17
 operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
 
 template <class Iterator1, class Iterator2>
-auto
+constexpr auto   // constexpr in C++17
 operator-(const move_iterator<Iterator1>& x,
           const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
 
 template <class Iterator>
-move_iterator<Iterator> operator+(typename move_iterator<Iterator>::difference_type n, 
-                                     const move_iterator<Iterator>& x);
+constexpr move_iterator<Iterator> operator+(   // constexpr in C++17
+            typename move_iterator<Iterator>::difference_type n, 
+            const move_iterator<Iterator>& x);
 
-template <class Iterator>
-move_iterator<Iterator> make_move_iterator(const Iterator& i);
+template <class Iterator>   // constexpr in C++17
+constexpr  move_iterator<Iterator> make_move_iterator(const Iterator& i);
 
 
 template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
@@ -511,8 +514,8 @@
 template <class _Tp>
 struct __is_exactly_input_iterator
     : public integral_constant<bool, 
-    	 __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value && 
-    	!__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
+         __has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value && 
+        !__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
 
 template<class _Category, class _Tp, class _Distance = ptrdiff_t,
          class _Pointer = _Tp*, class _Reference = _Tp&>
@@ -1055,37 +1058,40 @@
     typedef typename iterator_traits<iterator_type>::reference reference;
 #endif
 
-    _LIBCPP_INLINE_VISIBILITY move_iterator() : __i() {}
-    _LIBCPP_INLINE_VISIBILITY explicit move_iterator(_Iter __x) : __i(__x) {}
-    template <class _Up> _LIBCPP_INLINE_VISIBILITY move_iterator(const move_iterator<_Up>& __u)
-        : __i(__u.base()) {}
-    _LIBCPP_INLINE_VISIBILITY _Iter base() const {return __i;}
-    _LIBCPP_INLINE_VISIBILITY reference operator*() const {
-      return static_cast<reference>(*__i);
-    }
-    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const { return __i;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator& operator++() {++__i; return *this;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator  operator++(int)
-        {move_iterator __tmp(*this); ++__i; return __tmp;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator& operator--() {--__i; return *this;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator  operator--(int)
-        {move_iterator __tmp(*this); --__i; return __tmp;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator  operator+ (difference_type __n) const
-        {return move_iterator(__i + __n);}
-    _LIBCPP_INLINE_VISIBILITY move_iterator& operator+=(difference_type __n)
-        {__i += __n; return *this;}
-    _LIBCPP_INLINE_VISIBILITY move_iterator  operator- (difference_type __n) const
-        {return move_iterator(__i - __n);}
-    _LIBCPP_INLINE_VISIBILITY move_iterator& operator-=(difference_type __n)
-        {__i -= __n; return *this;}
-    _LIBCPP_INLINE_VISIBILITY reference         operator[](difference_type __n) const
-    {
-      return static_cast<reference>(__i[__n]);
-    }
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator() : __i() {}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    explicit move_iterator(_Iter __x) : __i(__x) {}
+    template <class _Up>
+      _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+      move_iterator(const move_iterator<_Up>& __u) : __i(__u.base()) {}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 _Iter base() const {return __i;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14 
+    reference operator*() const { return static_cast<reference>(*__i); }
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    pointer  operator->() const { return __i;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator& operator++() {++__i; return *this;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator  operator++(int) {move_iterator __tmp(*this); ++__i; return __tmp;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator& operator--() {--__i; return *this;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator  operator--(int) {move_iterator __tmp(*this); --__i; return __tmp;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator  operator+ (difference_type __n) const {return move_iterator(__i + __n);}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator& operator+=(difference_type __n) {__i += __n; return *this;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator  operator- (difference_type __n) const {return move_iterator(__i - __n);}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    move_iterator& operator-=(difference_type __n) {__i -= __n; return *this;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
+    reference operator[](difference_type __n) const { return static_cast<reference>(__i[__n]); }
 };
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1093,7 +1099,7 @@
 }
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1101,7 +1107,7 @@
 }
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1109,7 +1115,7 @@
 }
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1117,7 +1123,7 @@
 }
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1125,7 +1131,7 @@
 }
 
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 bool
 operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 {
@@ -1134,7 +1140,7 @@
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 auto
 operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y)
 -> decltype(__x.base() - __y.base())
@@ -1152,7 +1158,7 @@
 #endif
 
 template <class _Iter>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 move_iterator<_Iter>
 operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x)
 {
@@ -1160,7 +1166,7 @@
 }
 
 template <class _Iter>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
 move_iterator<_Iter>
 make_move_iterator(_Iter __i)
 {
@@ -1550,19 +1556,19 @@
 
 template <class _Iter>
 struct __libcpp_is_trivial_iterator
-	: public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
-	
+    : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
+    
 template <class _Iter>
 struct __libcpp_is_trivial_iterator<move_iterator<_Iter> >
-	: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
+    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
 
 template <class _Iter>
 struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> >
-	: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
+    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
 
 template <class _Iter>
 struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> >
-	: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
+    : public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
 
 
 template <class _Tp, size_t _Np>
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/make_move_iterator.pass.cpp
@@ -14,10 +14,13 @@
 // template <InputIterator Iter>
 //   move_iterator<Iter>
 //   make_move_iterator(const Iter& i);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -43,4 +46,12 @@
     std::make_move_iterator(a+4);
     std::make_move_iterator(a); // test for LWG issue 2061
     }
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    constexpr auto iter = std::make_move_iterator<const char *>(p);
+    static_assert(iter.base() == p);
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/minus.pass.cpp
@@ -16,10 +16,13 @@
 //   auto
 //   operator-(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y)
 //   -> decltype(x.base() - y.base());
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -36,4 +39,15 @@
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s+5), random_access_iterator<char*>(s), 5);
     test(s+5, s, 5);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert( it1 - it2 == -1, "");
+    static_assert( it2 - it1 ==  1, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.nonmember/plus.pass.cpp
@@ -14,10 +14,13 @@
 // template <RandomAccessIterator Iter>
 //   move_iterator<Iter>
 //   operator+(Iter::difference_type n, const move_iterator<Iter>& x);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,17 @@
     char s[] = "1234567890";
     test(random_access_iterator<char*>(s+5), 5, random_access_iterator<char*>(s+10));
     test(s+5, 5, s+10);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = it1 + 5;
+    static_assert(it1 != it2, "");
+    static_assert(it1 != it3, "");
+    static_assert(it2 == it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+/difference_type.pass.cpp
@@ -13,10 +13,13 @@
 
 // requires RandomAccessIterator<Iter>
 //   move_iterator operator+(difference_type n) const;
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -33,4 +36,17 @@
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
     test(s+5, 5, s+10);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = it1 + 5;
+    static_assert(it1 != it2, "");
+    static_assert(it1 != it3, "");
+    static_assert(it2 == it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.+=/difference_type.pass.cpp
@@ -13,10 +13,13 @@
 
 // requires RandomAccessIterator<Iter>
 //   move_iterator& operator+=(difference_type n);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,17 @@
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
     test(s+5, 5, s+10);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p) += 5;
+    static_assert(it1 != it2, "");
+    static_assert(it1 != it3, "");
+    static_assert(it2 == it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-/difference_type.pass.cpp
@@ -13,10 +13,13 @@
 
 // requires RandomAccessIterator<Iter>
 //   move_iterator operator-(difference_type n) const;
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -33,4 +36,17 @@
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
     test(s+5, 5, s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = it2 - 5;
+    static_assert(it1 != it2, "");
+    static_assert(it1 == it3, "");
+    static_assert(it2 != it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.-=/difference_type.pass.cpp
@@ -13,10 +13,13 @@
 
 // requires RandomAccessIterator<Iter>
 //   move_iterator& operator-=(difference_type n);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,13 @@
     const char* s = "1234567890";
     test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
     test(s+5, 5, s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    constexpr auto it1 = std::make_move_iterator(p);
+    constexpr auto it2 = std::make_move_iterator(p+5) -= 5;
+    static_assert(it1 == it2, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_eq.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasEqualTo<Iter1, Iter2>
 //   bool
 //   operator==(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -43,4 +46,17 @@
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s+1), false);
     test(s, s, true);
     test(s, s+1, false);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert(!(it1 == it2), "");
+    static_assert( (it1 == it3), "");
+    static_assert(!(it2 == it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gt.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasLess<Iter2, Iter1>
 //   bool
 //   operator>(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -39,4 +42,17 @@
     test(s, s, false);
     test(s, s+1, false);
     test(s+1, s, true);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert(!(it1 > it2), "");
+    static_assert(!(it1 > it3), "");
+    static_assert( (it2 > it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_gte.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasLess<Iter1, Iter2>
 //   bool
 //   operator>=(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -39,4 +42,17 @@
     test(s, s, true);
     test(s, s+1, false);
     test(s+1, s, true);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert(!(it1 >= it2), "");
+    static_assert( (it1 >= it3), "");
+    static_assert( (it2 >= it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lt.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasLess<Iter1, Iter2>
 //   bool
 //   operator<(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -39,4 +42,17 @@
     test(s, s, false);
     test(s, s+1, true);
     test(s+1, s, false);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert( (it1 < it2), "");
+    static_assert(!(it1 < it3), "");
+    static_assert(!(it2 < it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_lte.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasLess<Iter2, Iter1>
 //   bool
 //   operator<=(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -39,4 +42,17 @@
     test(s, s, true);
     test(s, s+1, true);
     test(s+1, s, false);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert( (it1 <= it2), "");
+    static_assert( (it1 <= it3), "");
+    static_assert(!(it2 <= it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.comp/op_neq.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasEqualTo<Iter1, Iter2>
 //   bool
 //   operator!=(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -43,4 +46,17 @@
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s+1), true);
     test(s, s, false);
     test(s, s+1, true);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p + 5);
+    constexpr MI it3 = std::make_move_iterator(p);
+    static_assert( (it1 != it2), "");
+    static_assert(!(it1 != it3), "");
+    static_assert( (it2 != it3), "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/convert.pass.cpp
@@ -14,10 +14,13 @@
 // template <class U>
 //   requires HasConstructor<Iter, const U&>
 //   move_iterator(const move_iterator<U> &u);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It, class U>
@@ -41,4 +44,13 @@
     test<bidirectional_iterator<Base*> >(bidirectional_iterator<Derived*>(&d));
     test<random_access_iterator<const Base*> >(random_access_iterator<Derived*>(&d));
     test<Base*>(&d);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const Derived *p = nullptr;
+    constexpr std::move_iterator<const Derived *>     it1 = std::make_move_iterator(p);
+    constexpr std::move_iterator<const Base *>        it2(it1);
+    static_assert(it2.base() == p);
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/default.pass.cpp
@@ -12,9 +12,12 @@
 // move_iterator
 
 // move_iterator();
+//
+//  constexpr in C++17
 
 #include <iterator>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -31,4 +34,10 @@
     test<bidirectional_iterator<char*> >();
     test<random_access_iterator<char*> >();
     test<char*>();
+
+#if TEST_STD_VER > 14
+    {
+    constexpr std::move_iterator<const char *> it;
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.const/iter.pass.cpp
@@ -12,10 +12,13 @@
 // move_iterator
 
 // explicit move_iterator(Iter i);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,12 @@
     test(bidirectional_iterator<char*>(s));
     test(random_access_iterator<char*>(s));
     test(s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    constexpr std::move_iterator<const char *> it(p);
+    static_assert(it.base() == p);
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/post.pass.cpp
@@ -12,10 +12,13 @@
 // move_iterator
 
 // move_iterator operator--(int);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,17 @@
     test(bidirectional_iterator<char*>(s+1), bidirectional_iterator<char*>(s));
     test(random_access_iterator<char*>(s+1), random_access_iterator<char*>(s));
     test(s+1, s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(it1 != it2, "");
+    constexpr MI it3 = std::make_move_iterator(p+1) --;
+    static_assert(it1 != it3, "");
+    static_assert(it2 == it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.decr/pre.pass.cpp
@@ -12,10 +12,13 @@
 // move_iterator
 
 // move_iterator& operator--();
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -34,4 +37,17 @@
     test(bidirectional_iterator<char*>(s+1), bidirectional_iterator<char*>(s));
     test(random_access_iterator<char*>(s+1), random_access_iterator<char*>(s));
     test(s+1, s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(it1 != it2, "");
+    constexpr MI it3 = -- std::make_move_iterator(p+1);
+    static_assert(it1 == it3, "");
+    static_assert(it2 != it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/post.pass.cpp
@@ -12,10 +12,13 @@
 // move_iterator
 
 // move_iterator operator++(int);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -36,4 +39,17 @@
     test(bidirectional_iterator<char*>(s), bidirectional_iterator<char*>(s+1));
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s+1));
     test(s, s+1);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(it1 != it2, "");
+    constexpr MI it3 = std::make_move_iterator(p) ++;
+    static_assert(it1 == it3, "");
+    static_assert(it2 != it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.incr/pre.pass.cpp
@@ -12,10 +12,13 @@
 // move_iterator
 
 // move_iterator& operator++();
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -36,4 +39,17 @@
     test(bidirectional_iterator<char*>(s), bidirectional_iterator<char*>(s+1));
     test(random_access_iterator<char*>(s), random_access_iterator<char*>(s+1));
     test(s, s+1);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(it1 != it2, "");
+    constexpr MI it3 = ++ std::make_move_iterator(p);
+    static_assert(it1 != it3, "");
+    static_assert(it2 == it3, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.index/difference_type.pass.cpp
@@ -13,6 +13,8 @@
 
 // requires RandomAccessIterator<Iter>
 //   unspecified operator[](difference_type n) const;
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
@@ -20,6 +22,7 @@
 #include <memory>
 #endif
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It>
@@ -55,4 +58,14 @@
         p[j].reset(i+j);
     test(p, 3, Ptr(i+3));
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    static_assert(it1[0] == '1', "");
+    static_assert(it1[5] == '6', "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.ref/op_arrow.pass.cpp
@@ -12,10 +12,14 @@
 // move_iterator
 
 // pointer operator->() const;
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
+
 template <class It>
 void
 test(It i)
@@ -28,4 +32,15 @@
 {
     char s[] = "123";
     test(s);
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(it1.operator->() == p, "");
+    static_assert(it2.operator->() == p + 1, "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op.star/op_star.pass.cpp
@@ -12,6 +12,8 @@
 // move_iterator
 
 // reference operator*() const;
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
@@ -19,6 +21,8 @@
 #include <memory>
 #endif
 
+#include "test_macros.h"
+
 class A
 {
     int data_;
@@ -58,4 +62,15 @@
     std::unique_ptr<int, do_nothing> p(&i);
     test(&p, std::unique_ptr<int, do_nothing>(&i));
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#if TEST_STD_VER > 14
+    {
+    constexpr const char *p = "123456789";
+    typedef std::move_iterator<const char *> MI;
+    constexpr MI it1 = std::make_move_iterator(p);
+    constexpr MI it2 = std::make_move_iterator(p+1);
+    static_assert(*it1 == p[0], "");
+    static_assert(*it2 == p[1], "");
+    }
+#endif
 }
Index: test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
===================================================================
--- test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
+++ test/std/iterators/predef.iterators/move.iterators/move.iter.ops/move.iter.op=/move_iterator.pass.cpp
@@ -15,10 +15,13 @@
 //   requires HasAssign<Iter, const U&>
 //   move_iterator&
 //   operator=(const move_iterator<U>& u);
+//
+//  constexpr in C++17
 
 #include <iterator>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 template <class It, class U>
@@ -44,4 +47,14 @@
     test<bidirectional_iterator<Base*> >(bidirectional_iterator<Derived*>(&d));
     test<random_access_iterator<const Base*> >(random_access_iterator<Derived*>(&d));
     test<Base*>(&d);
+#if TEST_STD_VER > 14
+    {
+    using BaseIter    = std::move_iterator<const Base *>;
+    using DerivedIter = std::move_iterator<const Derived *>;
+    constexpr const Derived *p = nullptr;
+    constexpr DerivedIter     it1 = std::make_move_iterator(p);
+    constexpr BaseIter        it2 = (BaseIter{nullptr} = it1);
+    static_assert(it2.base() == p, "");
+    }
+#endif
 }