diff --git a/libcxx/test/std/containers/views/span.iterators/begin.pass.cpp b/libcxx/test/std/containers/views/span.iterators/begin.pass.cpp
--- a/libcxx/test/std/containers/views/span.iterators/begin.pass.cpp
+++ b/libcxx/test/std/containers/views/span.iterators/begin.pass.cpp
@@ -19,89 +19,77 @@
 #include "test_macros.h"
 
 template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
-    bool ret = true;
-    typename Span::iterator b = s.begin();
-
-    if (s.empty())
-    {
-        ret = ret && (b == s.end());
-    }
-    else
-    {
-        ret = ret && ( *b ==  s[0]);
-        ret = ret && (&*b == &s[0]);
-    }
-    return ret;
+constexpr bool testConstexprSpan(Span s) {
+  bool ret = true;
+  typename Span::iterator b = s.begin();
+
+  if (s.empty()) {
+    ret = ret && (b == s.end());
+  } else {
+    ret = ret && (*b == s[0]);
+    ret = ret && (&*b == &s[0]);
+  }
+  return ret;
 }
 
-
 template <class Span>
-void testRuntimeSpan(Span s)
-{
-    typename Span::iterator b = s.begin();
-
-    if (s.empty())
-    {
-        assert(b == s.end());
-    }
-    else
-    {
-        assert( *b ==  s[0]);
-        assert(&*b == &s[0]);
-    }
+void testRuntimeSpan(Span s) {
+  typename Span::iterator b = s.begin();
+
+  if (s.empty()) {
+    assert(b == s.end());
+  } else {
+    assert(*b == s[0]);
+    assert(&*b == &s[0]);
+  }
 }
 
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
-          int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
-    static_assert(testConstexprSpan(std::span<int>()),            "");
-    static_assert(testConstexprSpan(std::span<long>()),           "");
-    static_assert(testConstexprSpan(std::span<double>()),         "");
-    static_assert(testConstexprSpan(std::span<A>()),              "");
-    static_assert(testConstexprSpan(std::span<std::string>()),    "");
-
-    static_assert(testConstexprSpan(std::span<int, 0>()),         "");
-    static_assert(testConstexprSpan(std::span<long, 0>()),        "");
-    static_assert(testConstexprSpan(std::span<double, 0>()),      "");
-    static_assert(testConstexprSpan(std::span<A, 0>()),           "");
-    static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)),    "");
-
-
-    testRuntimeSpan(std::span<int>        ());
-    testRuntimeSpan(std::span<long>       ());
-    testRuntimeSpan(std::span<double>     ());
-    testRuntimeSpan(std::span<A>          ());
-    testRuntimeSpan(std::span<std::string>());
-
-    testRuntimeSpan(std::span<int, 0>        ());
-    testRuntimeSpan(std::span<long, 0>       ());
-    testRuntimeSpan(std::span<double, 0>     ());
-    testRuntimeSpan(std::span<A, 0>          ());
-    testRuntimeSpan(std::span<std::string, 0>());
-
-    testRuntimeSpan(std::span<int>(iArr2, 1));
-    testRuntimeSpan(std::span<int>(iArr2, 2));
-    testRuntimeSpan(std::span<int>(iArr2, 3));
-    testRuntimeSpan(std::span<int>(iArr2, 4));
-    testRuntimeSpan(std::span<int>(iArr2, 5));
-
-    std::string s;
-    testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
-    testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+  static_assert(testConstexprSpan(std::span<int>()), "");
+  static_assert(testConstexprSpan(std::span<long>()), "");
+  static_assert(testConstexprSpan(std::span<double>()), "");
+  static_assert(testConstexprSpan(std::span<A>()), "");
+  static_assert(testConstexprSpan(std::span<std::string>()), "");
+
+  static_assert(testConstexprSpan(std::span<int, 0>()), "");
+  static_assert(testConstexprSpan(std::span<long, 0>()), "");
+  static_assert(testConstexprSpan(std::span<double, 0>()), "");
+  static_assert(testConstexprSpan(std::span<A, 0>()), "");
+  static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
+
+  testRuntimeSpan(std::span<int>());
+  testRuntimeSpan(std::span<long>());
+  testRuntimeSpan(std::span<double>());
+  testRuntimeSpan(std::span<A>());
+  testRuntimeSpan(std::span<std::string>());
+
+  testRuntimeSpan(std::span<int, 0>());
+  testRuntimeSpan(std::span<long, 0>());
+  testRuntimeSpan(std::span<double, 0>());
+  testRuntimeSpan(std::span<A, 0>());
+  testRuntimeSpan(std::span<std::string, 0>());
+
+  testRuntimeSpan(std::span<int>(iArr2, 1));
+  testRuntimeSpan(std::span<int>(iArr2, 2));
+  testRuntimeSpan(std::span<int>(iArr2, 3));
+  testRuntimeSpan(std::span<int>(iArr2, 4));
+  testRuntimeSpan(std::span<int>(iArr2, 5));
+
+  std::string s;
+  testRuntimeSpan(std::span<std::string>(&s, (std::size_t)0));
+  testRuntimeSpan(std::span<std::string>(&s, 1));
 
   return 0;
 }
diff --git a/libcxx/test/std/containers/views/span.iterators/end.pass.cpp b/libcxx/test/std/containers/views/span.iterators/end.pass.cpp
--- a/libcxx/test/std/containers/views/span.iterators/end.pass.cpp
+++ b/libcxx/test/std/containers/views/span.iterators/end.pass.cpp
@@ -19,93 +19,81 @@
 #include "test_macros.h"
 
 template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
-    bool ret = true;
-    typename Span::iterator e = s.end();
-    if (s.empty())
-    {
-        ret = ret &&  (e == s.begin());
-    }
-    else
-    {
-    	typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
-        ret = ret &&  (e != s.begin());
-        ret = ret &&  (&*( e-1) == last);
-    }
-
-    ret = ret &&  (static_cast<size_t>(e - s.begin()) == s.size());
-    return ret;
+constexpr bool testConstexprSpan(Span s) {
+  bool ret = true;
+  typename Span::iterator e = s.end();
+  if (s.empty()) {
+    ret = ret && (e == s.begin());
+  } else {
+    typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
+    ret = ret && (e != s.begin());
+    ret = ret && (&*(e - 1) == last);
+  }
+
+  ret = ret && (static_cast<size_t>(e - s.begin()) == s.size());
+  return ret;
 }
 
 template <class Span>
-void testRuntimeSpan(Span s)
-{
-    typename Span::iterator e = s.end();
-    if (s.empty())
-    {
-        assert(e == s.begin());
-    }
-    else
-    {
-    	typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
-        assert(e != s.begin());
-        assert(&*( e-1) == last);
-    }
-
-    assert(static_cast<size_t>(e - s.begin()) == s.size());
+void testRuntimeSpan(Span s) {
+  typename Span::iterator e = s.end();
+  if (s.empty()) {
+    assert(e == s.begin());
+  } else {
+    typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
+    assert(e != s.begin());
+    assert(&*(e - 1) == last);
+  }
+
+  assert(static_cast<size_t>(e - s.begin()) == s.size());
 }
 
-
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
-          int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
-    static_assert(testConstexprSpan(std::span<int>()),            "");
-    static_assert(testConstexprSpan(std::span<long>()),           "");
-    static_assert(testConstexprSpan(std::span<double>()),         "");
-    static_assert(testConstexprSpan(std::span<A>()),              "");
-    static_assert(testConstexprSpan(std::span<std::string>()),    "");
-
-    static_assert(testConstexprSpan(std::span<int, 0>()),         "");
-    static_assert(testConstexprSpan(std::span<long, 0>()),        "");
-    static_assert(testConstexprSpan(std::span<double, 0>()),      "");
-    static_assert(testConstexprSpan(std::span<A, 0>()),           "");
-    static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)),    "");
-
-
-    testRuntimeSpan(std::span<int>        ());
-    testRuntimeSpan(std::span<long>       ());
-    testRuntimeSpan(std::span<double>     ());
-    testRuntimeSpan(std::span<A>          ());
-    testRuntimeSpan(std::span<std::string>());
-
-    testRuntimeSpan(std::span<int, 0>        ());
-    testRuntimeSpan(std::span<long, 0>       ());
-    testRuntimeSpan(std::span<double, 0>     ());
-    testRuntimeSpan(std::span<A, 0>          ());
-    testRuntimeSpan(std::span<std::string, 0>());
-
-    testRuntimeSpan(std::span<int>(iArr2, 1));
-    testRuntimeSpan(std::span<int>(iArr2, 2));
-    testRuntimeSpan(std::span<int>(iArr2, 3));
-    testRuntimeSpan(std::span<int>(iArr2, 4));
-    testRuntimeSpan(std::span<int>(iArr2, 5));
-
-    std::string s;
-    testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
-    testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+  static_assert(testConstexprSpan(std::span<int>()), "");
+  static_assert(testConstexprSpan(std::span<long>()), "");
+  static_assert(testConstexprSpan(std::span<double>()), "");
+  static_assert(testConstexprSpan(std::span<A>()), "");
+  static_assert(testConstexprSpan(std::span<std::string>()), "");
+
+  static_assert(testConstexprSpan(std::span<int, 0>()), "");
+  static_assert(testConstexprSpan(std::span<long, 0>()), "");
+  static_assert(testConstexprSpan(std::span<double, 0>()), "");
+  static_assert(testConstexprSpan(std::span<A, 0>()), "");
+  static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
+
+  testRuntimeSpan(std::span<int>());
+  testRuntimeSpan(std::span<long>());
+  testRuntimeSpan(std::span<double>());
+  testRuntimeSpan(std::span<A>());
+  testRuntimeSpan(std::span<std::string>());
+
+  testRuntimeSpan(std::span<int, 0>());
+  testRuntimeSpan(std::span<long, 0>());
+  testRuntimeSpan(std::span<double, 0>());
+  testRuntimeSpan(std::span<A, 0>());
+  testRuntimeSpan(std::span<std::string, 0>());
+
+  testRuntimeSpan(std::span<int>(iArr2, 1));
+  testRuntimeSpan(std::span<int>(iArr2, 2));
+  testRuntimeSpan(std::span<int>(iArr2, 3));
+  testRuntimeSpan(std::span<int>(iArr2, 4));
+  testRuntimeSpan(std::span<int>(iArr2, 5));
+
+  std::string s;
+  testRuntimeSpan(std::span<std::string>(&s, (std::size_t)0));
+  testRuntimeSpan(std::span<std::string>(&s, 1));
 
   return 0;
 }
diff --git a/libcxx/test/std/containers/views/span.iterators/rbegin.pass.cpp b/libcxx/test/std/containers/views/span.iterators/rbegin.pass.cpp
--- a/libcxx/test/std/containers/views/span.iterators/rbegin.pass.cpp
+++ b/libcxx/test/std/containers/views/span.iterators/rbegin.pass.cpp
@@ -19,90 +19,77 @@
 #include "test_macros.h"
 
 template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
-    bool ret = true;
-    typename Span::reverse_iterator b = s.rbegin();
-    if (s.empty())
-    {
-        ret = ret &&  ( b ==  s.rend());
-    }
-    else
-    {
-        const typename Span::size_type last = s.size() - 1;
-        ret = ret && ( *b ==  s[last]);
-        ret = ret && (&*b == &s[last]);
-    }
-    return ret;
+constexpr bool testConstexprSpan(Span s) {
+  bool ret = true;
+  typename Span::reverse_iterator b = s.rbegin();
+  if (s.empty()) {
+    ret = ret && (b == s.rend());
+  } else {
+    const typename Span::size_type last = s.size() - 1;
+    ret = ret && (*b == s[last]);
+    ret = ret && (&*b == &s[last]);
+  }
+  return ret;
 }
 
-
 template <class Span>
-void testRuntimeSpan(Span s)
-{
-    typename Span::reverse_iterator b = s.rbegin();
-    if (s.empty())
-    {
-        assert(b == s.rend());
-    }
-    else
-    {
-        const typename Span::size_type last = s.size() - 1;
-        assert( *b ==  s[last]);
-        assert(&*b == &s[last]);
-    }
+void testRuntimeSpan(Span s) {
+  typename Span::reverse_iterator b = s.rbegin();
+  if (s.empty()) {
+    assert(b == s.rend());
+  } else {
+    const typename Span::size_type last = s.size() - 1;
+    assert(*b == s[last]);
+    assert(&*b == &s[last]);
+  }
 }
 
-
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
-          int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
-    static_assert(testConstexprSpan(std::span<int>()),            "");
-    static_assert(testConstexprSpan(std::span<long>()),           "");
-    static_assert(testConstexprSpan(std::span<double>()),         "");
-    static_assert(testConstexprSpan(std::span<A>()),              "");
-    static_assert(testConstexprSpan(std::span<std::string>()),    "");
-
-    static_assert(testConstexprSpan(std::span<int, 0>()),         "");
-    static_assert(testConstexprSpan(std::span<long, 0>()),        "");
-    static_assert(testConstexprSpan(std::span<double, 0>()),      "");
-    static_assert(testConstexprSpan(std::span<A, 0>()),           "");
-    static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)),    "");
-
-
-    testRuntimeSpan(std::span<int>        ());
-    testRuntimeSpan(std::span<long>       ());
-    testRuntimeSpan(std::span<double>     ());
-    testRuntimeSpan(std::span<A>          ());
-    testRuntimeSpan(std::span<std::string>());
-
-    testRuntimeSpan(std::span<int, 0>        ());
-    testRuntimeSpan(std::span<long, 0>       ());
-    testRuntimeSpan(std::span<double, 0>     ());
-    testRuntimeSpan(std::span<A, 0>          ());
-    testRuntimeSpan(std::span<std::string, 0>());
-
-    testRuntimeSpan(std::span<int>(iArr2, 1));
-    testRuntimeSpan(std::span<int>(iArr2, 2));
-    testRuntimeSpan(std::span<int>(iArr2, 3));
-    testRuntimeSpan(std::span<int>(iArr2, 4));
-    testRuntimeSpan(std::span<int>(iArr2, 5));
-
-    std::string s;
-    testRuntimeSpan(std::span<std::string>(&s, static_cast<std::size_t>(0)));
-    testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+  static_assert(testConstexprSpan(std::span<int>()), "");
+  static_assert(testConstexprSpan(std::span<long>()), "");
+  static_assert(testConstexprSpan(std::span<double>()), "");
+  static_assert(testConstexprSpan(std::span<A>()), "");
+  static_assert(testConstexprSpan(std::span<std::string>()), "");
+
+  static_assert(testConstexprSpan(std::span<int, 0>()), "");
+  static_assert(testConstexprSpan(std::span<long, 0>()), "");
+  static_assert(testConstexprSpan(std::span<double, 0>()), "");
+  static_assert(testConstexprSpan(std::span<A, 0>()), "");
+  static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
+
+  testRuntimeSpan(std::span<int>());
+  testRuntimeSpan(std::span<long>());
+  testRuntimeSpan(std::span<double>());
+  testRuntimeSpan(std::span<A>());
+  testRuntimeSpan(std::span<std::string>());
+
+  testRuntimeSpan(std::span<int, 0>());
+  testRuntimeSpan(std::span<long, 0>());
+  testRuntimeSpan(std::span<double, 0>());
+  testRuntimeSpan(std::span<A, 0>());
+  testRuntimeSpan(std::span<std::string, 0>());
+
+  testRuntimeSpan(std::span<int>(iArr2, 1));
+  testRuntimeSpan(std::span<int>(iArr2, 2));
+  testRuntimeSpan(std::span<int>(iArr2, 3));
+  testRuntimeSpan(std::span<int>(iArr2, 4));
+  testRuntimeSpan(std::span<int>(iArr2, 5));
+
+  std::string s;
+  testRuntimeSpan(std::span<std::string>(&s, static_cast<std::size_t>(0)));
+  testRuntimeSpan(std::span<std::string>(&s, 1));
 
   return 0;
 }
diff --git a/libcxx/test/std/containers/views/span.iterators/rend.pass.cpp b/libcxx/test/std/containers/views/span.iterators/rend.pass.cpp
--- a/libcxx/test/std/containers/views/span.iterators/rend.pass.cpp
+++ b/libcxx/test/std/containers/views/span.iterators/rend.pass.cpp
@@ -19,89 +19,77 @@
 #include "test_macros.h"
 
 template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
-    bool ret = true;
-    typename Span::reverse_iterator e = s.rend();
-    if (s.empty())
-    {
-        ret = ret &&  (e == s.rbegin());
-    }
-    else
-    {
-        ret = ret &&  (e != s.rbegin());
-    }
-
-    ret = ret &&  (static_cast<size_t>(e - s.rbegin()) == s.size());
-    return ret;
+constexpr bool testConstexprSpan(Span s) {
+  bool ret = true;
+  typename Span::reverse_iterator e = s.rend();
+  if (s.empty()) {
+    ret = ret && (e == s.rbegin());
+  } else {
+    ret = ret && (e != s.rbegin());
+  }
+
+  ret = ret && (static_cast<size_t>(e - s.rbegin()) == s.size());
+  return ret;
 }
 
 template <class Span>
-void testRuntimeSpan(Span s)
-{
-    typename Span::reverse_iterator e = s.rend();
-    if (s.empty())
-    {
-        assert(e == s.rbegin());
-    }
-    else
-    {
-        assert(e != s.rbegin());
-    }
-
-    assert(static_cast<size_t>(e - s.rbegin()) == s.size());
+void testRuntimeSpan(Span s) {
+  typename Span::reverse_iterator e = s.rend();
+  if (s.empty()) {
+    assert(e == s.rbegin());
+  } else {
+    assert(e != s.rbegin());
+  }
+
+  assert(static_cast<size_t>(e - s.rbegin()) == s.size());
 }
 
-
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9};
-          int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
-    static_assert(testConstexprSpan(std::span<int>()),            "");
-    static_assert(testConstexprSpan(std::span<long>()),           "");
-    static_assert(testConstexprSpan(std::span<double>()),         "");
-    static_assert(testConstexprSpan(std::span<A>()),              "");
-    static_assert(testConstexprSpan(std::span<std::string>()),    "");
-
-    static_assert(testConstexprSpan(std::span<int, 0>()),         "");
-    static_assert(testConstexprSpan(std::span<long, 0>()),        "");
-    static_assert(testConstexprSpan(std::span<double, 0>()),      "");
-    static_assert(testConstexprSpan(std::span<A, 0>()),           "");
-    static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)),    "");
-    static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)),    "");
-
-
-    testRuntimeSpan(std::span<int>        ());
-    testRuntimeSpan(std::span<long>       ());
-    testRuntimeSpan(std::span<double>     ());
-    testRuntimeSpan(std::span<A>          ());
-    testRuntimeSpan(std::span<std::string>());
-
-    testRuntimeSpan(std::span<int, 0>        ());
-    testRuntimeSpan(std::span<long, 0>       ());
-    testRuntimeSpan(std::span<double, 0>     ());
-    testRuntimeSpan(std::span<A, 0>          ());
-    testRuntimeSpan(std::span<std::string, 0>());
-
-    testRuntimeSpan(std::span<int>(iArr2, 1));
-    testRuntimeSpan(std::span<int>(iArr2, 2));
-    testRuntimeSpan(std::span<int>(iArr2, 3));
-    testRuntimeSpan(std::span<int>(iArr2, 4));
-    testRuntimeSpan(std::span<int>(iArr2, 5));
-
-    std::string s;
-    testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
-    testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+  static_assert(testConstexprSpan(std::span<int>()), "");
+  static_assert(testConstexprSpan(std::span<long>()), "");
+  static_assert(testConstexprSpan(std::span<double>()), "");
+  static_assert(testConstexprSpan(std::span<A>()), "");
+  static_assert(testConstexprSpan(std::span<std::string>()), "");
+
+  static_assert(testConstexprSpan(std::span<int, 0>()), "");
+  static_assert(testConstexprSpan(std::span<long, 0>()), "");
+  static_assert(testConstexprSpan(std::span<double, 0>()), "");
+  static_assert(testConstexprSpan(std::span<A, 0>()), "");
+  static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
+  static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
+
+  testRuntimeSpan(std::span<int>());
+  testRuntimeSpan(std::span<long>());
+  testRuntimeSpan(std::span<double>());
+  testRuntimeSpan(std::span<A>());
+  testRuntimeSpan(std::span<std::string>());
+
+  testRuntimeSpan(std::span<int, 0>());
+  testRuntimeSpan(std::span<long, 0>());
+  testRuntimeSpan(std::span<double, 0>());
+  testRuntimeSpan(std::span<A, 0>());
+  testRuntimeSpan(std::span<std::string, 0>());
+
+  testRuntimeSpan(std::span<int>(iArr2, 1));
+  testRuntimeSpan(std::span<int>(iArr2, 2));
+  testRuntimeSpan(std::span<int>(iArr2, 3));
+  testRuntimeSpan(std::span<int>(iArr2, 4));
+  testRuntimeSpan(std::span<int>(iArr2, 5));
+
+  std::string s;
+  testRuntimeSpan(std::span<std::string>(&s, (std::size_t)0));
+  testRuntimeSpan(std::span<std::string>(&s, 1));
 
   return 0;
 }