Index: include/span
===================================================================
--- include/span
+++ include/span
@@ -223,20 +223,6 @@
     _LIBCPP_INLINE_VISIBILITY constexpr span(      array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
     _LIBCPP_INLINE_VISIBILITY constexpr span(const array<value_type, _Extent>& __arr) noexcept : __data{__arr.data()} {}
 
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(      _Container& __c,
-            enable_if_t<__is_span_compatible_container<_Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}
-        { _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (container)"); }
-
-    template <class _Container>
-    inline _LIBCPP_INLINE_VISIBILITY
-        constexpr span(const _Container& __c,
-            enable_if_t<__is_span_compatible_container<const _Container, _Tp>::value, nullptr_t> = nullptr)
-        : __data{_VSTD::data(__c)}
-        { _LIBCPP_ASSERT(_Extent == _VSTD::size(__c), "size mismatch in span's constructor (const container)"); }
-
     template <class _OtherElementType>
     inline _LIBCPP_INLINE_VISIBILITY
         constexpr span(const span<_OtherElementType, _Extent>& __other,
Index: test/std/containers/views/span.cons/container.fail.cpp
===================================================================
--- test/std/containers/views/span.cons/container.fail.cpp
+++ test/std/containers/views/span.cons/container.fail.cpp
@@ -17,6 +17,7 @@
 //     constexpr span(const Container& cont);
 //
 // Remarks: These constructors shall not participate in overload resolution unless:
+//   — extent == dynamic_extent,
 //   — Container is not a specialization of span,
 //   — Container is not a specialization of array,
 //   — is_array_v<Container> is false,
@@ -69,30 +70,22 @@
 //  Missing size and/or data
     {
     std::span<int>    s1{IsAContainer<int>()};          // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s2{IsAContainer<int>()};          // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     std::span<int>    s3{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s4{NotAContainerNoData<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     std::span<int>    s5{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s6{NotAContainerNoSize<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     std::span<int>    s7{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s8{NotAContainerPrivate<int>()};  // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
 
 //  Again with the standard containers
     std::span<int>    s11{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s12{std::deque<int>()};           // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     std::span<int>    s13{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s14{std::list<int>()};            // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     std::span<int>    s15{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
-    std::span<int, 0> s16{std::forward_list<int>()};    // expected-error {{no matching constructor for initialization of 'std::span<int, 0>'}}
     }
 
 //  Not the same type
     {
     std::span<float>    s1{IsAContainer<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<float>'}}
-    std::span<float, 0> s2{IsAContainer<int>()};   // expected-error {{no matching constructor for initialization of 'std::span<float, 0>'}}
     }
 
-//  CV wrong (dynamically sized)
+//  CV wrong
     {
     std::span<               int> s1{IsAContainer<const          int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
     std::span<               int> s2{IsAContainer<      volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
@@ -103,15 +96,6 @@
     std::span<      volatile int> s7{IsAContainer<const volatile int>()};   // expected-error {{no matching constructor for initialization of 'std::span<volatile int>'}}
     }
 
-//  CV wrong (statically sized)
-    {
-    std::span<               int,1> s1{IsAContainer<const          int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<               int,1> s2{IsAContainer<      volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<               int,1> s3{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
-    std::span<const          int,1> s4{IsAContainer<      volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
-    std::span<const          int,1> s5{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 1>'}}
-    std::span<      volatile int,1> s6{IsAContainer<const          int>()}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
-    std::span<      volatile int,1> s7{IsAContainer<const volatile int>()}; // expected-error {{no matching constructor for initialization of 'std::span<volatile int, 1>'}}
-    }
-
+//  statically sized
+    std::span<int,1> s1{IsAContainer<int>()}; // expected-error {{no matching constructor for initialization of 'std::span<int, 1>'}}
 }
Index: test/std/containers/views/span.cons/container.pass.cpp
===================================================================
--- test/std/containers/views/span.cons/container.pass.cpp
+++ test/std/containers/views/span.cons/container.pass.cpp
@@ -17,6 +17,7 @@
 //     constexpr span(const Container& cont);
 //
 // Remarks: These constructors shall not participate in overload resolution unless:
+//   — extent == dynamic_extent,
 //   — Container is not a specialization of span,
 //   — Container is not a specialization of array,
 //   — is_array_v<Container> is false,
@@ -49,31 +50,18 @@
 {
     std::vector<int> v  = {1,2,3};
 
-//  Types the same (dynamic sized)
+//  Types the same
     {
     std::span<               int> s1{v};    // a span<               int> pointing at int.
     }
 
-//  Types the same (static sized)
+//  types different
     {
-    std::span<               int,3> s1{v};  // a span<               int> pointing at int.
-    }
-
-//  types different (dynamic sized)
-    {
     std::span<const          int> s1{v};    // a span<const          int> pointing at int.
     std::span<      volatile int> s2{v};    // a span<      volatile int> pointing at int.
     std::span<      volatile int> s3{v};    // a span<      volatile int> pointing at const int.
     std::span<const volatile int> s4{v};    // a span<const volatile int> pointing at int.
     }
-
-//  types different (static sized)
-    {
-    std::span<const          int,3> s1{v};  // a span<const          int> pointing at int.
-    std::span<      volatile int,3> s2{v};  // a span<      volatile int> pointing at int.
-    std::span<      volatile int,3> s3{v};  // a span<      volatile int> pointing at const int.
-    std::span<const volatile int,3> s4{v};  // a span<const volatile int> pointing at int.
-    }
 }
 
 
@@ -82,10 +70,7 @@
 {
     constexpr IsAContainer<const T> val{};
     std::span<const T>    s1{val};
-    std::span<const T, 1> s2{val};
-    return
-        s1.data() == val.getV() && s1.size() == 1
-    &&  s2.data() == val.getV() && s2.size() == 1;
+    return s1.data() == val.getV() && s1.size() == 1;
 }
 
 
@@ -94,9 +79,7 @@
 {
     IsAContainer<T> val{};
     std::span<const T>    s1{val};
-    std::span<const T, 1> s2{val};
     assert(s1.data() == val.getV() && s1.size() == 1);
-    assert(s2.data() == val.getV() && s2.size() == 1);
 }
 
 struct A{};