[llvm-branch-commits] [libcxx] 044b892 - [libc++] Use c++20 instead of c++2a consistently.

Marek Kurdej via llvm-branch-commits llvm-branch-commits at lists.llvm.org
Thu Jan 7 04:15:44 PST 2021


Author: Marek Kurdej
Date: 2021-01-07T13:11:33+01:00
New Revision: 044b892c79b31a77bc0e6f52a0ec97c58b5b89b7

URL: https://github.com/llvm/llvm-project/commit/044b892c79b31a77bc0e6f52a0ec97c58b5b89b7
DIFF: https://github.com/llvm/llvm-project/commit/044b892c79b31a77bc0e6f52a0ec97c58b5b89b7.diff

LOG: [libc++] Use c++20 instead of c++2a consistently.

* The only exception is that the flag -std=c++2a is still used not to break compatibility with older compilers (clang <= 9, gcc <= 9).
* Bump _LIBCPP_STD_VER for C++20 to 20 and use 21 for the future standard (C++2b).

That's a preparation step to add c++2b support to libc++.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D93383

Added: 
    libcxx/cmake/caches/Generic-cxx20.cmake

Modified: 
    libcxx/docs/DesignDocs/FeatureTestMacros.rst
    libcxx/docs/FeatureTestMacroTable.rst
    libcxx/docs/UsingLibcxx.rst
    libcxx/include/__config
    libcxx/include/new
    libcxx/include/string
    libcxx/include/string_view
    libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/numbers.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/span.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
    libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
    libcxx/test/support/test_macros.h
    libcxx/utils/ci/buildkite-pipeline.yml
    libcxx/utils/ci/run-buildbot
    libcxx/utils/generate_feature_test_macro_components.py

Removed: 
    libcxx/cmake/caches/Generic-cxx2a.cmake


################################################################################
diff  --git a/libcxx/cmake/caches/Generic-cxx2a.cmake b/libcxx/cmake/caches/Generic-cxx20.cmake
similarity index 100%
rename from libcxx/cmake/caches/Generic-cxx2a.cmake
rename to libcxx/cmake/caches/Generic-cxx20.cmake

diff  --git a/libcxx/docs/DesignDocs/FeatureTestMacros.rst b/libcxx/docs/DesignDocs/FeatureTestMacros.rst
index 644eb4a6b411..2c6f983ee6d0 100644
--- a/libcxx/docs/DesignDocs/FeatureTestMacros.rst
+++ b/libcxx/docs/DesignDocs/FeatureTestMacros.rst
@@ -8,7 +8,7 @@ Feature Test Macros
 Overview
 ========
 
-Libc++ implements the C++ feature test macros as specified in the C++2a standard,
+Libc++ implements the C++ feature test macros as specified in the C++20 standard,
 and before that in non-normative guiding documents
 (`See cppreference <https://en.cppreference.com/w/User:D41D8CD98F/feature_testing_macros>`_)
 

diff  --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index 5930cdaffaec..895e96f97d63 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -166,7 +166,7 @@ Status
     ------------------------------------------------- -----------------
     ``__cpp_lib_void_t``                              ``201411L``
     ------------------------------------------------- -----------------
-    **C++ 2a**
+    **C++ 20**
     -------------------------------------------------------------------
     ``__cpp_lib_array_constexpr``                     ``201811L``
     ------------------------------------------------- -----------------

diff  --git a/libcxx/docs/UsingLibcxx.rst b/libcxx/docs/UsingLibcxx.rst
index 4c37ada334b6..6bf67ce22db5 100644
--- a/libcxx/docs/UsingLibcxx.rst
+++ b/libcxx/docs/UsingLibcxx.rst
@@ -254,7 +254,7 @@ C++17 Specific Configuration Macros
 **_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR**:
   This macro is used to re-enable `std::auto_ptr` in C++17.
 
-C++2a Specific Configuration Macros:
+C++20 Specific Configuration Macros:
 ------------------------------------
 **_LIBCPP_DISABLE_NODISCARD_AFTER_CXX17**:
   This macro can be used to disable diagnostics emitted from functions marked

diff  --git a/libcxx/include/__config b/libcxx/include/__config
index 9f49e805d61b..4537d249cf4f 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -49,8 +49,10 @@
 #    define _LIBCPP_STD_VER 14
 #  elif __cplusplus <= 201703L
 #    define _LIBCPP_STD_VER 17
+#  elif __cplusplus <= 202002L
+#    define _LIBCPP_STD_VER 20
 #  else
-#    define _LIBCPP_STD_VER 18  // current year, or date of c++2a ratification
+#    define _LIBCPP_STD_VER 21  // current year, or date of c++2b ratification
 #  endif
 #endif  // _LIBCPP_STD_VER
 

diff  --git a/libcxx/include/new b/libcxx/include/new
index 8b17003b7b87..0562cef45868 100644
--- a/libcxx/include/new
+++ b/libcxx/include/new
@@ -49,11 +49,11 @@ new_handler get_new_handler() noexcept;
 template <class T> constexpr T* launder(T* p) noexcept; // C++17
 }  // std
 
-void* operator new(std::size_t size);                                   // replaceable, nodiscard in C++2a
-void* operator new(std::size_t size, std::align_val_t alignment);       // replaceable, C++17, nodiscard in C++2a
-void* operator new(std::size_t size, const std::nothrow_t&) noexcept;   // replaceable, nodiscard in C++2a
+void* operator new(std::size_t size);                                   // replaceable, nodiscard in C++20
+void* operator new(std::size_t size, std::align_val_t alignment);       // replaceable, C++17, nodiscard in C++20
+void* operator new(std::size_t size, const std::nothrow_t&) noexcept;   // replaceable, nodiscard in C++20
 void* operator new(std::size_t size, std::align_val_t alignment,
-                   const std::nothrow_t&) noexcept;                     // replaceable, C++17, nodiscard in C++2a
+                   const std::nothrow_t&) noexcept;                     // replaceable, C++17, nodiscard in C++20
 void  operator delete(void* ptr) noexcept;                              // replaceable
 void  operator delete(void* ptr, std::size_t size) noexcept;            // replaceable, C++14
 void  operator delete(void* ptr, std::align_val_t alignment) noexcept;  // replaceable, C++17
@@ -63,12 +63,12 @@ void  operator delete(void* ptr, const std::nothrow_t&) noexcept;       // repla
 void  operator delete(void* ptr, std:align_val_t alignment,
                       const std::nothrow_t&) noexcept;                  // replaceable, C++17
 
-void* operator new[](std::size_t size);                                 // replaceable, nodiscard in C++2a
+void* operator new[](std::size_t size);                                 // replaceable, nodiscard in C++20
 void* operator new[](std::size_t size,
-                     std::align_val_t alignment) noexcept;              // replaceable, C++17, nodiscard in C++2a
-void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a
+                     std::align_val_t alignment) noexcept;              // replaceable, C++17, nodiscard in C++20
+void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20
 void* operator new[](std::size_t size, std::align_val_t alignment,
-                     const std::nothrow_t&) noexcept;                   // replaceable, C++17, nodiscard in C++2a
+                     const std::nothrow_t&) noexcept;                   // replaceable, C++17, nodiscard in C++20
 void  operator delete[](void* ptr) noexcept;                            // replaceable
 void  operator delete[](void* ptr, std::size_t size) noexcept;          // replaceable, C++14
 void  operator delete[](void* ptr,
@@ -79,8 +79,8 @@ void  operator delete[](void* ptr, const std::nothrow_t&) noexcept;     // repla
 void  operator delete[](void* ptr, std::align_val_t alignment,
                         const std::nothrow_t&) noexcept;                // replaceable, C++17
 
-void* operator new  (std::size_t size, void* ptr) noexcept;             // nodiscard in C++2a
-void* operator new[](std::size_t size, void* ptr) noexcept;             // nodiscard in C++2a
+void* operator new  (std::size_t size, void* ptr) noexcept;             // nodiscard in C++20
+void* operator new[](std::size_t size, void* ptr) noexcept;             // nodiscard in C++20
 void  operator delete  (void* ptr, void*) noexcept;
 void  operator delete[](void* ptr, void*) noexcept;
 

diff  --git a/libcxx/include/string b/libcxx/include/string
index 6805791d89c2..ef606665e22c 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -317,12 +317,12 @@ public:
     int compare(size_type pos1, size_type n1, const value_type* s) const;
     int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const;
 
-    bool starts_with(basic_string_view<charT, traits> sv) const noexcept; // C++2a
-    bool starts_with(charT c) const noexcept;                             // C++2a
-    bool starts_with(const charT* s) const;                               // C++2a
-    bool ends_with(basic_string_view<charT, traits> sv) const noexcept;   // C++2a
-    bool ends_with(charT c) const noexcept;                               // C++2a
-    bool ends_with(const charT* s) const;                                 // C++2a
+    bool starts_with(basic_string_view<charT, traits> sv) const noexcept; // C++20
+    bool starts_with(charT c) const noexcept;                             // C++20
+    bool starts_with(const charT* s) const;                               // C++20
+    bool ends_with(basic_string_view<charT, traits> sv) const noexcept;   // C++20
+    bool ends_with(charT c) const noexcept;                               // C++20
+    bool ends_with(const charT* s) const;                                 // C++20
 
     bool __invariants() const;
 };

diff  --git a/libcxx/include/string_view b/libcxx/include/string_view
index 44ffb02c432d..28bbd3690e2a 100644
--- a/libcxx/include/string_view
+++ b/libcxx/include/string_view
@@ -142,12 +142,12 @@ namespace std {
       constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
       constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
 
-      constexpr bool starts_with(basic_string_view s) const noexcept; // C++2a
-      constexpr bool starts_with(charT c) const noexcept;             // C++2a
-      constexpr bool starts_with(const charT* s) const;               // C++2a
-      constexpr bool ends_with(basic_string_view s) const noexcept;   // C++2a
-      constexpr bool ends_with(charT c) const noexcept;               // C++2a
-      constexpr bool ends_with(const charT* s) const;                 // C++2a
+      constexpr bool starts_with(basic_string_view s) const noexcept; // C++20
+      constexpr bool starts_with(charT c) const noexcept;             // C++20
+      constexpr bool starts_with(const charT* s) const;               // C++20
+      constexpr bool ends_with(basic_string_view s) const noexcept;   // C++20
+      constexpr bool ends_with(charT c) const noexcept;               // C++20
+      constexpr bool ends_with(const charT* s) const;                 // C++20
 
      private:
       const_pointer data_;  // exposition only

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
index 5458e9194297..820816dc2fd1 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
@@ -15,9 +15,9 @@
 
 /*  Constant                                 Value
     __cpp_lib_clamp                          201603L [C++17]
-    __cpp_lib_constexpr_swap_algorithms      201806L [C++2a]
+    __cpp_lib_constexpr_swap_algorithms      201806L [C++20]
     __cpp_lib_parallel_algorithm             201603L [C++17]
-    __cpp_lib_ranges                         201811L [C++2a]
+    __cpp_lib_ranges                         201811L [C++20]
     __cpp_lib_robust_nonmodifying_seq_ops    201304L [C++14]
     __cpp_lib_sample                         201603L [C++17]
 */
@@ -32,7 +32,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_parallel_algorithm
@@ -40,7 +40,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_robust_nonmodifying_seq_ops
@@ -58,7 +58,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_parallel_algorithm
@@ -66,7 +66,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_robust_nonmodifying_seq_ops
@@ -90,7 +90,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -107,7 +107,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_robust_nonmodifying_seq_ops
@@ -124,21 +124,21 @@
 #   error "__cpp_lib_sample should have the value 201603L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_clamp
-#   error "__cpp_lib_clamp should be defined in c++2a"
+#   error "__cpp_lib_clamp should be defined in c++20"
 # endif
 # if __cpp_lib_clamp != 201603L
-#   error "__cpp_lib_clamp should have the value 201603L in c++2a"
+#   error "__cpp_lib_clamp should have the value 201603L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_constexpr_swap_algorithms
-#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++2a"
+#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++20"
 #   endif
 #   if __cpp_lib_constexpr_swap_algorithms != 201806L
-#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++2a"
+#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_constexpr_swap_algorithms
@@ -148,10 +148,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_parallel_algorithm
-#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#     error "__cpp_lib_parallel_algorithm should be defined in c++20"
 #   endif
 #   if __cpp_lib_parallel_algorithm != 201603L
-#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_parallel_algorithm
@@ -161,10 +161,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges
-#     error "__cpp_lib_ranges should be defined in c++2a"
+#     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
 #   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#     error "__cpp_lib_ranges should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -173,19 +173,19 @@
 # endif
 
 # ifndef __cpp_lib_robust_nonmodifying_seq_ops
-#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++2a"
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++20"
 # endif
 # if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
-#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++2a"
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_sample
-#   error "__cpp_lib_sample should be defined in c++2a"
+#   error "__cpp_lib_sample should be defined in c++20"
 # endif
 # if __cpp_lib_sample != 201603L
-#   error "__cpp_lib_sample should have the value 201603L in c++2a"
+#   error "__cpp_lib_sample should have the value 201603L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
index f5255c0e26a6..e4f89d296ef8 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_any should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_any
-#   error "__cpp_lib_any should be defined in c++2a"
+#   error "__cpp_lib_any should be defined in c++20"
 # endif
 # if __cpp_lib_any != 201606L
-#   error "__cpp_lib_any should have the value 201606L in c++2a"
+#   error "__cpp_lib_any should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
index c2e831a3af31..494ba44c62f3 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
@@ -15,9 +15,9 @@
 
 /*  Constant                                Value
     __cpp_lib_array_constexpr               201603L [C++17]
-                                            201811L [C++2a]
+                                            201811L [C++20]
     __cpp_lib_nonmember_container_access    201411L [C++17]
-    __cpp_lib_to_array                      201907L [C++2a]
+    __cpp_lib_to_array                      201907L [C++20]
 */
 
 #include <array>
@@ -34,7 +34,7 @@
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
@@ -48,7 +48,7 @@
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
@@ -68,32 +68,32 @@
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_array_constexpr
-#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+#   error "__cpp_lib_array_constexpr should be defined in c++20"
 # endif
 # if __cpp_lib_array_constexpr != 201811L
-#   error "__cpp_lib_array_constexpr should have the value 201811L in c++2a"
+#   error "__cpp_lib_array_constexpr should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should be defined in c++2a"
+#   error "__cpp_lib_to_array should be defined in c++20"
 # endif
 # if __cpp_lib_to_array != 201907L
-#   error "__cpp_lib_to_array should have the value 201907L in c++2a"
+#   error "__cpp_lib_to_array should have the value 201907L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
index d4c63edb5b8a..3eeca0477652 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
@@ -16,15 +16,15 @@
 // Test the feature test macros defined by <atomic>
 
 /*  Constant                                   Value
-    __cpp_lib_atomic_flag_test                 201907L [C++2a]
-    __cpp_lib_atomic_float                     201711L [C++2a]
+    __cpp_lib_atomic_flag_test                 201907L [C++20]
+    __cpp_lib_atomic_float                     201711L [C++20]
     __cpp_lib_atomic_is_always_lock_free       201603L [C++17]
-    __cpp_lib_atomic_lock_free_type_aliases    201907L [C++2a]
-    __cpp_lib_atomic_ref                       201806L [C++2a]
-    __cpp_lib_atomic_shared_ptr                201711L [C++2a]
-    __cpp_lib_atomic_value_initialization      201911L [C++2a]
-    __cpp_lib_atomic_wait                      201907L [C++2a]
-    __cpp_lib_char8_t                          201811L [C++2a]
+    __cpp_lib_atomic_lock_free_type_aliases    201907L [C++20]
+    __cpp_lib_atomic_ref                       201806L [C++20]
+    __cpp_lib_atomic_shared_ptr                201711L [C++20]
+    __cpp_lib_atomic_value_initialization      201911L [C++20]
+    __cpp_lib_atomic_wait                      201907L [C++20]
+    __cpp_lib_char8_t                          201811L [C++20]
 */
 
 #include <atomic>
@@ -33,11 +33,11 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_is_always_lock_free
@@ -45,37 +45,37 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_is_always_lock_free
@@ -83,37 +83,37 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
@@ -130,37 +130,37 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_flag_test
-#     error "__cpp_lib_atomic_flag_test should be defined in c++2a"
+#     error "__cpp_lib_atomic_flag_test should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_flag_test != 201907L
-#     error "__cpp_lib_atomic_flag_test should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_flag_test should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_flag_test
@@ -170,10 +170,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_float
-#     error "__cpp_lib_atomic_float should be defined in c++2a"
+#     error "__cpp_lib_atomic_float should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_float != 201711L
-#     error "__cpp_lib_atomic_float should have the value 201711L in c++2a"
+#     error "__cpp_lib_atomic_float should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_float
@@ -183,10 +183,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_is_always_lock_free
-#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++2a"
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_is_always_lock_free != 201603L
-#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++2a"
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_is_always_lock_free
@@ -196,10 +196,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_lock_free_type_aliases
-#     error "__cpp_lib_atomic_lock_free_type_aliases should be defined in c++2a"
+#     error "__cpp_lib_atomic_lock_free_type_aliases should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_lock_free_type_aliases != 201907L
-#     error "__cpp_lib_atomic_lock_free_type_aliases should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_lock_free_type_aliases should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_lock_free_type_aliases
@@ -209,10 +209,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_ref
-#     error "__cpp_lib_atomic_ref should be defined in c++2a"
+#     error "__cpp_lib_atomic_ref should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_ref != 201806L
-#     error "__cpp_lib_atomic_ref should have the value 201806L in c++2a"
+#     error "__cpp_lib_atomic_ref should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_ref
@@ -222,10 +222,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_shared_ptr
-#     error "__cpp_lib_atomic_shared_ptr should be defined in c++2a"
+#     error "__cpp_lib_atomic_shared_ptr should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_shared_ptr != 201711L
-#     error "__cpp_lib_atomic_shared_ptr should have the value 201711L in c++2a"
+#     error "__cpp_lib_atomic_shared_ptr should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_shared_ptr
@@ -235,10 +235,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_value_initialization
-#     error "__cpp_lib_atomic_value_initialization should be defined in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_value_initialization != 201911L
-#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_value_initialization
@@ -248,10 +248,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should be defined in c++2a"
+#     error "__cpp_lib_atomic_wait should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_wait != 201907L
-#     error "__cpp_lib_atomic_wait should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_wait should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
@@ -261,10 +261,10 @@
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -272,6 +272,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
index 92a8ada73feb..be015e444eb5 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
@@ -14,9 +14,9 @@
 // Test the feature test macros defined by <bit>
 
 /*  Constant              Value
-    __cpp_lib_bit_cast    201806L [C++2a]
-    __cpp_lib_endian      201907L [C++2a]
-    __cpp_lib_int_pow2    202002L [C++2a]
+    __cpp_lib_bit_cast    201806L [C++20]
+    __cpp_lib_endian      201907L [C++20]
+    __cpp_lib_int_pow2    202002L [C++20]
 */
 
 #include <bit>
@@ -25,53 +25,53 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_bit_cast
-#     error "__cpp_lib_bit_cast should be defined in c++2a"
+#     error "__cpp_lib_bit_cast should be defined in c++20"
 #   endif
 #   if __cpp_lib_bit_cast != 201806L
-#     error "__cpp_lib_bit_cast should have the value 201806L in c++2a"
+#     error "__cpp_lib_bit_cast should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_bit_cast
@@ -80,19 +80,19 @@
 # endif
 
 # ifndef __cpp_lib_endian
-#   error "__cpp_lib_endian should be defined in c++2a"
+#   error "__cpp_lib_endian should be defined in c++20"
 # endif
 # if __cpp_lib_endian != 201907L
-#   error "__cpp_lib_endian should have the value 201907L in c++2a"
+#   error "__cpp_lib_endian should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should be defined in c++2a"
+#   error "__cpp_lib_int_pow2 should be defined in c++20"
 # endif
 # if __cpp_lib_int_pow2 != 202002L
-#   error "__cpp_lib_int_pow2 should have the value 202002L in c++2a"
+#   error "__cpp_lib_int_pow2 should have the value 202002L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
index 88da2dcca6d7..b27cc4f1bf99 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
@@ -60,22 +60,22 @@
 #   error "__cpp_lib_chrono_udls should have the value 201304L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_chrono
-#   error "__cpp_lib_chrono should be defined in c++2a"
+#   error "__cpp_lib_chrono should be defined in c++20"
 # endif
 # if __cpp_lib_chrono != 201611L
-#   error "__cpp_lib_chrono should have the value 201611L in c++2a"
+#   error "__cpp_lib_chrono should have the value 201611L in c++20"
 # endif
 
 # ifndef __cpp_lib_chrono_udls
-#   error "__cpp_lib_chrono_udls should be defined in c++2a"
+#   error "__cpp_lib_chrono_udls should be defined in c++20"
 # endif
 # if __cpp_lib_chrono_udls != 201304L
-#   error "__cpp_lib_chrono_udls should have the value 201304L in c++2a"
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
index d81218e66ab9..974c4cd76d2e 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
@@ -63,21 +63,21 @@
 #   endif
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_hypot
-#   error "__cpp_lib_hypot should be defined in c++2a"
+#   error "__cpp_lib_hypot should be defined in c++20"
 # endif
 # if __cpp_lib_hypot != 201603L
-#   error "__cpp_lib_hypot should have the value 201603L in c++2a"
+#   error "__cpp_lib_hypot should have the value 201603L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_math_special_functions
-#     error "__cpp_lib_math_special_functions should be defined in c++2a"
+#     error "__cpp_lib_math_special_functions should be defined in c++20"
 #   endif
 #   if __cpp_lib_math_special_functions != 201603L
-#     error "__cpp_lib_math_special_functions should have the value 201603L in c++2a"
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_math_special_functions
@@ -85,6 +85,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
index 7f1836fba00e..bcf419dbb903 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/compare.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <compare>
 
 /*  Constant                          Value
-    __cpp_lib_three_way_comparison    201711L [C++2a]
+    __cpp_lib_three_way_comparison    201711L [C++20]
 */
 
 #include <compare>
@@ -23,29 +23,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_three_way_comparison
-#     error "__cpp_lib_three_way_comparison should be defined in c++2a"
+#     error "__cpp_lib_three_way_comparison should be defined in c++20"
 #   endif
 #   if __cpp_lib_three_way_comparison != 201711L
-#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++2a"
+#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_three_way_comparison
@@ -53,6 +53,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
index bcff0bbe1856..9c39619ff68e 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
@@ -44,15 +44,15 @@
 #   error "__cpp_lib_complex_udls should have the value 201309L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_complex_udls
-#   error "__cpp_lib_complex_udls should be defined in c++2a"
+#   error "__cpp_lib_complex_udls should be defined in c++20"
 # endif
 # if __cpp_lib_complex_udls != 201309L
-#   error "__cpp_lib_complex_udls should have the value 201309L in c++2a"
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
index 9ec2157d974c..a35da2dbb993 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <concepts>
 
 /*  Constant              Value
-    __cpp_lib_concepts    201806L [C++2a]
+    __cpp_lib_concepts    201806L [C++20]
 */
 
 #include <concepts>
@@ -23,29 +23,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_concepts
-#     error "__cpp_lib_concepts should be defined in c++2a"
+#     error "__cpp_lib_concepts should be defined in c++20"
 #   endif
 #   if __cpp_lib_concepts != 201806L
-#     error "__cpp_lib_concepts should have the value 201806L in c++2a"
+#     error "__cpp_lib_concepts should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_concepts
@@ -53,6 +53,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
index b18ea07ea0cc..b124150a3baf 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_byte should have the value 201603L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_byte
-#   error "__cpp_lib_byte should be defined in c++2a"
+#   error "__cpp_lib_byte should be defined in c++20"
 # endif
 # if __cpp_lib_byte != 201603L
-#   error "__cpp_lib_byte should have the value 201603L in c++2a"
+#   error "__cpp_lib_byte should have the value 201603L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
index ac6f94ff70f9..267ecf79c127 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
@@ -15,7 +15,7 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
@@ -29,7 +29,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -43,7 +43,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -60,7 +60,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
@@ -70,29 +70,29 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
index 1ecebb48f0f5..5bc32aa5c0f4 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_uncaught_exceptions
-#   error "__cpp_lib_uncaught_exceptions should be defined in c++2a"
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++20"
 # endif
 # if __cpp_lib_uncaught_exceptions != 201411L
-#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++2a"
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
index 1244efa4aeba..40e47ce9fc24 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
@@ -47,14 +47,14 @@
 #   endif
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_execution
-#     error "__cpp_lib_execution should be defined in c++2a"
+#     error "__cpp_lib_execution should be defined in c++20"
 #   endif
 #   if __cpp_lib_execution != 201603L
-#     error "__cpp_lib_execution should have the value 201603L in c++2a"
+#     error "__cpp_lib_execution should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_execution
@@ -62,6 +62,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
index d1c09fc7ee48..e3e5f6f7a218 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <filesystem>
 
 /*  Constant                Value
-    __cpp_lib_char8_t       201811L [C++2a]
+    __cpp_lib_char8_t       201811L [C++20]
     __cpp_lib_filesystem    201703L [C++17]
 */
 
@@ -24,7 +24,7 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_filesystem
@@ -34,7 +34,7 @@
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_filesystem
@@ -44,7 +44,7 @@
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_filesystem
@@ -54,14 +54,14 @@
 #   error "__cpp_lib_filesystem should have the value 201703L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -70,12 +70,12 @@
 # endif
 
 # ifndef __cpp_lib_filesystem
-#   error "__cpp_lib_filesystem should be defined in c++2a"
+#   error "__cpp_lib_filesystem should be defined in c++20"
 # endif
 # if __cpp_lib_filesystem != 201703L
-#   error "__cpp_lib_filesystem should have the value 201703L in c++2a"
+#   error "__cpp_lib_filesystem should have the value 201703L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
index 837abe395404..c57682e3b21b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
@@ -15,9 +15,9 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_incomplete_container_elements       201505L [C++17]
-    __cpp_lib_list_remove_return_type             201806L [C++2a]
+    __cpp_lib_list_remove_return_type             201806L [C++20]
     __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
@@ -31,7 +31,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -39,7 +39,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -53,7 +53,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -61,7 +61,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -78,7 +78,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
@@ -89,7 +89,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
@@ -99,43 +99,43 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
-#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++20"
 # endif
 # if __cpp_lib_incomplete_container_elements != 201505L
-#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++20"
 # endif
 
 # ifndef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   error "__cpp_lib_list_remove_return_type should be defined in c++20"
 # endif
 # if __cpp_lib_list_remove_return_type != 201806L
-#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
index 2b556010f00e..6fa7b8580110 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
@@ -14,12 +14,12 @@
 // Test the feature test macros defined by <functional>
 
 /*  Constant                           Value
-    __cpp_lib_bind_front               201811L [C++2a]
+    __cpp_lib_bind_front               201811L [C++20]
     __cpp_lib_boyer_moore_searcher     201603L [C++17]
-    __cpp_lib_constexpr_functional     201907L [C++2a]
+    __cpp_lib_constexpr_functional     201907L [C++20]
     __cpp_lib_invoke                   201411L [C++17]
     __cpp_lib_not_fn                   201603L [C++17]
-    __cpp_lib_ranges                   201811L [C++2a]
+    __cpp_lib_ranges                   201811L [C++20]
     __cpp_lib_result_of_sfinae         201210L [C++14]
     __cpp_lib_transparent_operators    201210L [C++14]
                                        201510L [C++17]
@@ -31,7 +31,7 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_boyer_moore_searcher
@@ -39,7 +39,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_invoke
@@ -51,7 +51,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_result_of_sfinae
@@ -65,7 +65,7 @@
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_boyer_moore_searcher
@@ -73,7 +73,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_invoke
@@ -85,7 +85,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_result_of_sfinae
@@ -105,7 +105,7 @@
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -122,7 +122,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_invoke
@@ -140,7 +140,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_result_of_sfinae
@@ -157,14 +157,14 @@
 #   error "__cpp_lib_transparent_operators should have the value 201510L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_bind_front
-#     error "__cpp_lib_bind_front should be defined in c++2a"
+#     error "__cpp_lib_bind_front should be defined in c++20"
 #   endif
 #   if __cpp_lib_bind_front != 201811L
-#     error "__cpp_lib_bind_front should have the value 201811L in c++2a"
+#     error "__cpp_lib_bind_front should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_bind_front
@@ -174,10 +174,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_boyer_moore_searcher
-#     error "__cpp_lib_boyer_moore_searcher should be defined in c++2a"
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++20"
 #   endif
 #   if __cpp_lib_boyer_moore_searcher != 201603L
-#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++2a"
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_boyer_moore_searcher
@@ -186,32 +186,32 @@
 # endif
 
 # ifndef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should be defined in c++2a"
+#   error "__cpp_lib_constexpr_functional should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_functional != 201907L
-#   error "__cpp_lib_constexpr_functional should have the value 201907L in c++2a"
+#   error "__cpp_lib_constexpr_functional should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_invoke
-#   error "__cpp_lib_invoke should be defined in c++2a"
+#   error "__cpp_lib_invoke should be defined in c++20"
 # endif
 # if __cpp_lib_invoke != 201411L
-#   error "__cpp_lib_invoke should have the value 201411L in c++2a"
+#   error "__cpp_lib_invoke should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_not_fn
-#   error "__cpp_lib_not_fn should be defined in c++2a"
+#   error "__cpp_lib_not_fn should be defined in c++20"
 # endif
 # if __cpp_lib_not_fn != 201603L
-#   error "__cpp_lib_not_fn should have the value 201603L in c++2a"
+#   error "__cpp_lib_not_fn should have the value 201603L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges
-#     error "__cpp_lib_ranges should be defined in c++2a"
+#     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
 #   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#     error "__cpp_lib_ranges should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -220,19 +220,19 @@
 # endif
 
 # ifndef __cpp_lib_result_of_sfinae
-#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+#   error "__cpp_lib_result_of_sfinae should be defined in c++20"
 # endif
 # if __cpp_lib_result_of_sfinae != 201210L
-#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++20"
 # endif
 
 # ifndef __cpp_lib_transparent_operators
-#   error "__cpp_lib_transparent_operators should be defined in c++2a"
+#   error "__cpp_lib_transparent_operators should be defined in c++20"
 # endif
 # if __cpp_lib_transparent_operators != 201510L
-#   error "__cpp_lib_transparent_operators should have the value 201510L in c++2a"
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
index 0b1b4ea3e106..36612e020826 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
@@ -46,15 +46,15 @@
 #   error "__cpp_lib_quoted_string_io should have the value 201304L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_quoted_string_io
-#   error "__cpp_lib_quoted_string_io should be defined in c++2a"
+#   error "__cpp_lib_quoted_string_io should be defined in c++20"
 # endif
 # if __cpp_lib_quoted_string_io != 201304L
-#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++2a"
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
index 967173ea61a1..761712b70f8b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/istream.version.pass.cpp
@@ -16,7 +16,7 @@
 // Test the feature test macros defined by <istream>
 
 /*  Constant             Value
-    __cpp_lib_char8_t    201811L [C++2a]
+    __cpp_lib_char8_t    201811L [C++20]
 */
 
 #include <istream>
@@ -25,29 +25,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -55,6 +55,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
index 0c128f5a46de..c6e5851d0755 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
@@ -15,11 +15,11 @@
 
 /*  Constant                                Value
     __cpp_lib_array_constexpr               201603L [C++17]
-                                            201811L [C++2a]
+                                            201811L [C++20]
     __cpp_lib_make_reverse_iterator         201402L [C++14]
     __cpp_lib_nonmember_container_access    201411L [C++17]
     __cpp_lib_null_iterators                201304L [C++14]
-    __cpp_lib_ranges                        201811L [C++2a]
+    __cpp_lib_ranges                        201811L [C++20]
 */
 
 #include <iterator>
@@ -44,7 +44,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
@@ -72,7 +72,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
@@ -106,45 +106,45 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_array_constexpr
-#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+#   error "__cpp_lib_array_constexpr should be defined in c++20"
 # endif
 # if __cpp_lib_array_constexpr != 201811L
-#   error "__cpp_lib_array_constexpr should have the value 201811L in c++2a"
+#   error "__cpp_lib_array_constexpr should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_reverse_iterator
-#   error "__cpp_lib_make_reverse_iterator should be defined in c++2a"
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++20"
 # endif
 # if __cpp_lib_make_reverse_iterator != 201402L
-#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2a"
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_null_iterators
-#   error "__cpp_lib_null_iterators should be defined in c++2a"
+#   error "__cpp_lib_null_iterators should be defined in c++20"
 # endif
 # if __cpp_lib_null_iterators != 201304L
-#   error "__cpp_lib_null_iterators should have the value 201304L in c++2a"
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges
-#     error "__cpp_lib_ranges should be defined in c++2a"
+#     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
 #   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#     error "__cpp_lib_ranges should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -152,6 +152,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
index 2d2f243e7041..daf8869c0021 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/limits.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <limits>
 
 /*  Constant             Value
-    __cpp_lib_char8_t    201811L [C++2a]
+    __cpp_lib_char8_t    201811L [C++20]
 */
 
 #include <limits>
@@ -23,29 +23,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -53,6 +53,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
index 218510fb65ef..92552a752c19 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
@@ -15,9 +15,9 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_incomplete_container_elements       201505L [C++17]
-    __cpp_lib_list_remove_return_type             201806L [C++2a]
+    __cpp_lib_list_remove_return_type             201806L [C++20]
     __cpp_lib_nonmember_container_access          201411L [C++17]
 */
 
@@ -31,7 +31,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -39,7 +39,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -53,7 +53,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -61,7 +61,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -78,7 +78,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
@@ -89,7 +89,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
@@ -99,43 +99,43 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
-#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++20"
 # endif
 # if __cpp_lib_incomplete_container_elements != 201505L
-#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++20"
 # endif
 
 # ifndef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   error "__cpp_lib_list_remove_return_type should be defined in c++20"
 # endif
 # if __cpp_lib_list_remove_return_type != 201806L
-#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
index 43156342555f..9744c7e4511b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/locale.version.pass.cpp
@@ -16,7 +16,7 @@
 // Test the feature test macros defined by <locale>
 
 /*  Constant             Value
-    __cpp_lib_char8_t    201811L [C++2a]
+    __cpp_lib_char8_t    201811L [C++20]
 */
 
 #include <locale>
@@ -25,29 +25,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -55,6 +55,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
index c6ef179249b1..58aa741ba6de 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
@@ -15,7 +15,7 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_generic_associative_lookup          201304L [C++14]
     __cpp_lib_map_try_emplace                     201411L [C++17]
     __cpp_lib_node_extract                        201606L [C++17]
@@ -32,7 +32,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_associative_lookup
@@ -58,7 +58,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
@@ -90,7 +90,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
@@ -121,50 +121,50 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
-#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_associative_lookup != 201304L
-#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_map_try_emplace
-#   error "__cpp_lib_map_try_emplace should be defined in c++2a"
+#   error "__cpp_lib_map_try_emplace should be defined in c++20"
 # endif
 # if __cpp_lib_map_try_emplace != 201411L
-#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++2a"
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
-#   error "__cpp_lib_node_extract should be defined in c++2a"
+#   error "__cpp_lib_node_extract should be defined in c++20"
 # endif
 # if __cpp_lib_node_extract != 201606L
-#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+#   error "__cpp_lib_node_extract should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
index 4a2b778a32bd..3fe3990bb75f 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
@@ -16,11 +16,11 @@
 /*  Constant                                      Value
     __cpp_lib_addressof_constexpr                 201603L [C++17]
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_atomic_value_initialization         201911L [C++2a]
-    __cpp_lib_constexpr_dynamic_alloc             201907L [C++2a]
+    __cpp_lib_atomic_value_initialization         201911L [C++20]
+    __cpp_lib_constexpr_dynamic_alloc             201907L [C++20]
     __cpp_lib_enable_shared_from_this             201603L [C++17]
     __cpp_lib_make_unique                         201304L [C++14]
-    __cpp_lib_ranges                              201811L [C++2a]
+    __cpp_lib_ranges                              201811L [C++20]
     __cpp_lib_raw_memory_algorithms               201606L [C++17]
     __cpp_lib_shared_ptr_arrays                   201611L [C++17]
     __cpp_lib_shared_ptr_weak_type                201606L [C++17]
@@ -40,11 +40,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_enable_shared_from_this
@@ -56,7 +56,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_raw_memory_algorithms
@@ -82,11 +82,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_enable_shared_from_this
@@ -101,7 +101,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_raw_memory_algorithms
@@ -139,11 +139,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_enable_shared_from_this
@@ -161,7 +161,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_raw_memory_algorithms
@@ -185,14 +185,14 @@
 #   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
 #   ifndef __cpp_lib_addressof_constexpr
-#     error "__cpp_lib_addressof_constexpr should be defined in c++2a"
+#     error "__cpp_lib_addressof_constexpr should be defined in c++20"
 #   endif
 #   if __cpp_lib_addressof_constexpr != 201603L
-#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++2a"
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_addressof_constexpr
@@ -201,18 +201,18 @@
 # endif
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_value_initialization
-#     error "__cpp_lib_atomic_value_initialization should be defined in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_value_initialization != 201911L
-#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_value_initialization
@@ -221,32 +221,32 @@
 # endif
 
 # ifndef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should be defined in c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_dynamic_alloc != 201907L
-#   error "__cpp_lib_constexpr_dynamic_alloc should have the value 201907L in c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_enable_shared_from_this
-#   error "__cpp_lib_enable_shared_from_this should be defined in c++2a"
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++20"
 # endif
 # if __cpp_lib_enable_shared_from_this != 201603L
-#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_unique
-#   error "__cpp_lib_make_unique should be defined in c++2a"
+#   error "__cpp_lib_make_unique should be defined in c++20"
 # endif
 # if __cpp_lib_make_unique != 201304L
-#   error "__cpp_lib_make_unique should have the value 201304L in c++2a"
+#   error "__cpp_lib_make_unique should have the value 201304L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges
-#     error "__cpp_lib_ranges should be defined in c++2a"
+#     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
 #   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#     error "__cpp_lib_ranges should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -255,26 +255,26 @@
 # endif
 
 # ifndef __cpp_lib_raw_memory_algorithms
-#   error "__cpp_lib_raw_memory_algorithms should be defined in c++2a"
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++20"
 # endif
 # if __cpp_lib_raw_memory_algorithms != 201606L
-#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++2a"
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_shared_ptr_arrays
-#   error "__cpp_lib_shared_ptr_arrays should be defined in c++2a"
+#   error "__cpp_lib_shared_ptr_arrays should be defined in c++20"
 # endif
 # if __cpp_lib_shared_ptr_arrays != 201611L
-#   error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++2a"
+#   error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++20"
 # endif
 
 # ifndef __cpp_lib_shared_ptr_weak_type
-#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++2a"
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++20"
 # endif
 # if __cpp_lib_shared_ptr_weak_type != 201606L
-#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2a"
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
index 9dae806b8123..04dd82caf61b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_scoped_lock should have the value 201703L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_scoped_lock
-#   error "__cpp_lib_scoped_lock should be defined in c++2a"
+#   error "__cpp_lib_scoped_lock should be defined in c++20"
 # endif
 # if __cpp_lib_scoped_lock != 201703L
-#   error "__cpp_lib_scoped_lock should have the value 201703L in c++2a"
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
index ef834613cad3..c8e1f2a45145 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <new>
 
 /*  Constant                                Value
-    __cpp_lib_destroying_delete             201806L [C++2a]
+    __cpp_lib_destroying_delete             201806L [C++20]
     __cpp_lib_hardware_interference_size    201703L [C++17]
     __cpp_lib_launder                       201606L [C++17]
 */
@@ -25,7 +25,7 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_hardware_interference_size
@@ -39,7 +39,7 @@
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_hardware_interference_size
@@ -53,7 +53,7 @@
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -76,14 +76,14 @@
 #   error "__cpp_lib_launder should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
 #   ifndef __cpp_lib_destroying_delete
-#     error "__cpp_lib_destroying_delete should be defined in c++2a"
+#     error "__cpp_lib_destroying_delete should be defined in c++20"
 #   endif
 #   if __cpp_lib_destroying_delete != 201806L
-#     error "__cpp_lib_destroying_delete should have the value 201806L in c++2a"
+#     error "__cpp_lib_destroying_delete should have the value 201806L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_destroying_delete
@@ -93,10 +93,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_hardware_interference_size
-#     error "__cpp_lib_hardware_interference_size should be defined in c++2a"
+#     error "__cpp_lib_hardware_interference_size should be defined in c++20"
 #   endif
 #   if __cpp_lib_hardware_interference_size != 201703L
-#     error "__cpp_lib_hardware_interference_size should have the value 201703L in c++2a"
+#     error "__cpp_lib_hardware_interference_size should have the value 201703L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_hardware_interference_size
@@ -105,12 +105,12 @@
 # endif
 
 # ifndef __cpp_lib_launder
-#   error "__cpp_lib_launder should be defined in c++2a"
+#   error "__cpp_lib_launder should be defined in c++20"
 # endif
 # if __cpp_lib_launder != 201606L
-#   error "__cpp_lib_launder should have the value 201606L in c++2a"
+#   error "__cpp_lib_launder should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/numbers.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/numbers.version.pass.cpp
index 489b2178e2e9..9b2afb28fc15 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/numbers.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/numbers.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <numbers>
 
 /*  Constant                    Value
-    __cpp_lib_math_constants    201907L [C++2a]
+    __cpp_lib_math_constants    201907L [C++20]
 */
 
 #include <numbers>
@@ -23,29 +23,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_concepts) && __cpp_concepts >= 201811L
 #   ifndef __cpp_lib_math_constants
-#     error "__cpp_lib_math_constants should be defined in c++2a"
+#     error "__cpp_lib_math_constants should be defined in c++20"
 #   endif
 #   if __cpp_lib_math_constants != 201907L
-#     error "__cpp_lib_math_constants should have the value 201907L in c++2a"
+#     error "__cpp_lib_math_constants should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_math_constants
@@ -53,6 +53,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
index 881c81474eb0..eee46c380e0b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
@@ -14,9 +14,9 @@
 // Test the feature test macros defined by <numeric>
 
 /*  Constant                        Value
-    __cpp_lib_constexpr_numeric     201911L [C++2a]
+    __cpp_lib_constexpr_numeric     201911L [C++20]
     __cpp_lib_gcd_lcm               201606L [C++17]
-    __cpp_lib_interpolate           201902L [C++2a]
+    __cpp_lib_interpolate           201902L [C++20]
     __cpp_lib_parallel_algorithm    201603L [C++17]
 */
 
@@ -26,7 +26,7 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_gcd_lcm
@@ -34,7 +34,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_parallel_algorithm
@@ -44,7 +44,7 @@
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_gcd_lcm
@@ -52,7 +52,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_parallel_algorithm
@@ -62,7 +62,7 @@
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_gcd_lcm
@@ -73,7 +73,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -89,35 +89,35 @@
 #   endif
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should be defined in c++2a"
+#   error "__cpp_lib_constexpr_numeric should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_numeric != 201911L
-#   error "__cpp_lib_constexpr_numeric should have the value 201911L in c++2a"
+#   error "__cpp_lib_constexpr_numeric should have the value 201911L in c++20"
 # endif
 
 # ifndef __cpp_lib_gcd_lcm
-#   error "__cpp_lib_gcd_lcm should be defined in c++2a"
+#   error "__cpp_lib_gcd_lcm should be defined in c++20"
 # endif
 # if __cpp_lib_gcd_lcm != 201606L
-#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++2a"
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should be defined in c++2a"
+#   error "__cpp_lib_interpolate should be defined in c++20"
 # endif
 # if __cpp_lib_interpolate != 201902L
-#   error "__cpp_lib_interpolate should have the value 201902L in c++2a"
+#   error "__cpp_lib_interpolate should have the value 201902L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_parallel_algorithm
-#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#     error "__cpp_lib_parallel_algorithm should be defined in c++20"
 #   endif
 #   if __cpp_lib_parallel_algorithm != 201603L
-#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_parallel_algorithm
@@ -125,6 +125,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
index d88fbb0fee80..1a104470e2df 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_optional should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_optional
-#   error "__cpp_lib_optional should be defined in c++2a"
+#   error "__cpp_lib_optional should be defined in c++20"
 # endif
 # if __cpp_lib_optional != 201606L
-#   error "__cpp_lib_optional should have the value 201606L in c++2a"
+#   error "__cpp_lib_optional should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
index bb0737583ba4..bbc70b147b01 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/ostream.version.pass.cpp
@@ -16,7 +16,7 @@
 // Test the feature test macros defined by <ostream>
 
 /*  Constant             Value
-    __cpp_lib_char8_t    201811L [C++2a]
+    __cpp_lib_char8_t    201811L [C++20]
 */
 
 #include <ostream>
@@ -25,29 +25,29 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -55,6 +55,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
index a73d936dd4ab..e457dbeadcbd 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
@@ -43,15 +43,15 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
index 2ea98256e1bd..a44804bbfe7e 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
index bc26397d6431..ae60ce656b6a 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
@@ -15,7 +15,7 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_generic_associative_lookup          201304L [C++14]
     __cpp_lib_node_extract                        201606L [C++17]
     __cpp_lib_nonmember_container_access          201411L [C++17]
@@ -31,7 +31,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_associative_lookup
@@ -53,7 +53,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
@@ -81,7 +81,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
@@ -105,43 +105,43 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
-#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_associative_lookup != 201304L
-#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
-#   error "__cpp_lib_node_extract should be defined in c++2a"
+#   error "__cpp_lib_node_extract should be defined in c++20"
 # endif
 # if __cpp_lib_node_extract != 201606L
-#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+#   error "__cpp_lib_node_extract should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
index 7c92dfc085ce..b4b362f8f4ff 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
@@ -80,14 +80,14 @@
 #   endif
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should be defined in c++2a"
+#     error "__cpp_lib_shared_mutex should be defined in c++20"
 #   endif
 #   if __cpp_lib_shared_mutex != 201505L
-#     error "__cpp_lib_shared_mutex should have the value 201505L in c++2a"
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
@@ -97,10 +97,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should be defined in c++2a"
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++20"
 #   endif
 #   if __cpp_lib_shared_timed_mutex != 201402L
-#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++2a"
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
@@ -108,6 +108,6 @@
 #   endif
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.pass.cpp
index c1a9f8632705..a496714c6149 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <span>
 
 /*  Constant          Value
-    __cpp_lib_span    202002L [C++2a]
+    __cpp_lib_span    202002L [C++20]
 */
 
 #include <span>
@@ -23,30 +23,30 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_span
-#   error "__cpp_lib_span should be defined in c++2a"
+#   error "__cpp_lib_span should be defined in c++20"
 # endif
 # if __cpp_lib_span != 202002L
-#   error "__cpp_lib_span should have the value 202002L in c++2a"
+#   error "__cpp_lib_span should have the value 202002L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
index eacd5ff1ecbd..aa9aa3285d4b 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
@@ -15,8 +15,8 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_char8_t                             201811L [C++2a]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_char8_t                             201811L [C++20]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_nonmember_container_access          201411L [C++17]
     __cpp_lib_string_udls                         201304L [C++14]
     __cpp_lib_string_view                         201606L [C++17]
@@ -32,11 +32,11 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -58,11 +58,11 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_nonmember_container_access
@@ -90,11 +90,11 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
@@ -118,21 +118,21 @@
 #   error "__cpp_lib_string_view should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -141,33 +141,33 @@
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_string_udls
-#   error "__cpp_lib_string_udls should be defined in c++2a"
+#   error "__cpp_lib_string_udls should be defined in c++20"
 # endif
 # if __cpp_lib_string_udls != 201304L
-#   error "__cpp_lib_string_udls should have the value 201304L in c++2a"
+#   error "__cpp_lib_string_udls should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_string_view
-#   error "__cpp_lib_string_view should be defined in c++2a"
+#   error "__cpp_lib_string_view should be defined in c++20"
 # endif
 # if __cpp_lib_string_view != 201606L
-#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+#   error "__cpp_lib_string_view should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
index 1fca20d41f8c..d489b63932e0 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
@@ -14,7 +14,7 @@
 // Test the feature test macros defined by <string_view>
 
 /*  Constant                 Value
-    __cpp_lib_char8_t        201811L [C++2a]
+    __cpp_lib_char8_t        201811L [C++20]
     __cpp_lib_string_view    201606L [C++17]
 */
 
@@ -24,7 +24,7 @@
 #if TEST_STD_VER < 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_string_view
@@ -34,7 +34,7 @@
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_string_view
@@ -44,7 +44,7 @@
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_string_view
@@ -54,14 +54,14 @@
 #   error "__cpp_lib_string_view should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -70,12 +70,12 @@
 # endif
 
 # ifndef __cpp_lib_string_view
-#   error "__cpp_lib_string_view should be defined in c++2a"
+#   error "__cpp_lib_string_view should be defined in c++20"
 # endif
 # if __cpp_lib_string_view != 201606L
-#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+#   error "__cpp_lib_string_view should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
index e4c3d54d1982..556ed84027fa 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
@@ -95,36 +95,36 @@
 #   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_apply
-#   error "__cpp_lib_apply should be defined in c++2a"
+#   error "__cpp_lib_apply should be defined in c++20"
 # endif
 # if __cpp_lib_apply != 201603L
-#   error "__cpp_lib_apply should have the value 201603L in c++2a"
+#   error "__cpp_lib_apply should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_from_tuple
-#   error "__cpp_lib_make_from_tuple should be defined in c++2a"
+#   error "__cpp_lib_make_from_tuple should be defined in c++20"
 # endif
 # if __cpp_lib_make_from_tuple != 201606L
-#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++2a"
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_tuple_element_t
-#   error "__cpp_lib_tuple_element_t should be defined in c++2a"
+#   error "__cpp_lib_tuple_element_t should be defined in c++20"
 # endif
 # if __cpp_lib_tuple_element_t != 201402L
-#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++2a"
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_tuples_by_type
-#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+#   error "__cpp_lib_tuples_by_type should be defined in c++20"
 # endif
 # if __cpp_lib_tuples_by_type != 201304L
-#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
index 29e76b36e4c1..487fc8d68cb7 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
@@ -18,7 +18,7 @@
     __cpp_lib_has_unique_object_representations    201606L [C++17]
     __cpp_lib_integral_constant_callable           201304L [C++14]
     __cpp_lib_is_aggregate                         201703L [C++17]
-    __cpp_lib_is_constant_evaluated                201811L [C++2a]
+    __cpp_lib_is_constant_evaluated                201811L [C++20]
     __cpp_lib_is_final                             201402L [C++14]
     __cpp_lib_is_invocable                         201703L [C++17]
     __cpp_lib_is_null_pointer                      201309L [C++14]
@@ -52,7 +52,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_is_final
@@ -113,7 +113,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_is_final
@@ -207,7 +207,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_is_final
@@ -273,21 +273,21 @@
 #   error "__cpp_lib_void_t should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_bool_constant
-#   error "__cpp_lib_bool_constant should be defined in c++2a"
+#   error "__cpp_lib_bool_constant should be defined in c++20"
 # endif
 # if __cpp_lib_bool_constant != 201505L
-#   error "__cpp_lib_bool_constant should have the value 201505L in c++2a"
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++20"
 # endif
 
 # if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
 #   ifndef __cpp_lib_has_unique_object_representations
-#     error "__cpp_lib_has_unique_object_representations should be defined in c++2a"
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++20"
 #   endif
 #   if __cpp_lib_has_unique_object_representations != 201606L
-#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++2a"
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_has_unique_object_representations
@@ -296,18 +296,18 @@
 # endif
 
 # ifndef __cpp_lib_integral_constant_callable
-#   error "__cpp_lib_integral_constant_callable should be defined in c++2a"
+#   error "__cpp_lib_integral_constant_callable should be defined in c++20"
 # endif
 # if __cpp_lib_integral_constant_callable != 201304L
-#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++2a"
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++20"
 # endif
 
 # if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
 #   ifndef __cpp_lib_is_aggregate
-#     error "__cpp_lib_is_aggregate should be defined in c++2a"
+#     error "__cpp_lib_is_aggregate should be defined in c++20"
 #   endif
 #   if __cpp_lib_is_aggregate != 201703L
-#     error "__cpp_lib_is_aggregate should have the value 201703L in c++2a"
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_is_aggregate
@@ -317,10 +317,10 @@
 
 # if TEST_HAS_BUILTIN(__builtin_is_constant_evaluated) || TEST_GCC_VER >= 900
 #   ifndef __cpp_lib_is_constant_evaluated
-#     error "__cpp_lib_is_constant_evaluated should be defined in c++2a"
+#     error "__cpp_lib_is_constant_evaluated should be defined in c++20"
 #   endif
 #   if __cpp_lib_is_constant_evaluated != 201811L
-#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++2a"
+#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_is_constant_evaluated
@@ -329,68 +329,68 @@
 # endif
 
 # ifndef __cpp_lib_is_final
-#   error "__cpp_lib_is_final should be defined in c++2a"
+#   error "__cpp_lib_is_final should be defined in c++20"
 # endif
 # if __cpp_lib_is_final != 201402L
-#   error "__cpp_lib_is_final should have the value 201402L in c++2a"
+#   error "__cpp_lib_is_final should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_invocable
-#   error "__cpp_lib_is_invocable should be defined in c++2a"
+#   error "__cpp_lib_is_invocable should be defined in c++20"
 # endif
 # if __cpp_lib_is_invocable != 201703L
-#   error "__cpp_lib_is_invocable should have the value 201703L in c++2a"
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_null_pointer
-#   error "__cpp_lib_is_null_pointer should be defined in c++2a"
+#   error "__cpp_lib_is_null_pointer should be defined in c++20"
 # endif
 # if __cpp_lib_is_null_pointer != 201309L
-#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++2a"
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_swappable
-#   error "__cpp_lib_is_swappable should be defined in c++2a"
+#   error "__cpp_lib_is_swappable should be defined in c++20"
 # endif
 # if __cpp_lib_is_swappable != 201603L
-#   error "__cpp_lib_is_swappable should have the value 201603L in c++2a"
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_logical_traits
-#   error "__cpp_lib_logical_traits should be defined in c++2a"
+#   error "__cpp_lib_logical_traits should be defined in c++20"
 # endif
 # if __cpp_lib_logical_traits != 201510L
-#   error "__cpp_lib_logical_traits should have the value 201510L in c++2a"
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_result_of_sfinae
-#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+#   error "__cpp_lib_result_of_sfinae should be defined in c++20"
 # endif
 # if __cpp_lib_result_of_sfinae != 201210L
-#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++20"
 # endif
 
 # ifndef __cpp_lib_transformation_trait_aliases
-#   error "__cpp_lib_transformation_trait_aliases should be defined in c++2a"
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++20"
 # endif
 # if __cpp_lib_transformation_trait_aliases != 201304L
-#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++2a"
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_type_trait_variable_templates
-#   error "__cpp_lib_type_trait_variable_templates should be defined in c++2a"
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++20"
 # endif
 # if __cpp_lib_type_trait_variable_templates != 201510L
-#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++2a"
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_void_t
-#   error "__cpp_lib_void_t should be defined in c++2a"
+#   error "__cpp_lib_void_t should be defined in c++20"
 # endif
 # if __cpp_lib_void_t != 201411L
-#   error "__cpp_lib_void_t should have the value 201411L in c++2a"
+#   error "__cpp_lib_void_t should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
index a3365f40b9bb..f37efd5752e5 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
@@ -15,8 +15,8 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
-    __cpp_lib_generic_unordered_lookup            201811L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
+    __cpp_lib_generic_unordered_lookup            201811L [C++20]
     __cpp_lib_node_extract                        201606L [C++17]
     __cpp_lib_nonmember_container_access          201411L [C++17]
     __cpp_lib_unordered_map_try_emplace           201411L [C++17]
@@ -32,11 +32,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_node_extract
@@ -58,11 +58,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_node_extract
@@ -87,11 +87,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
@@ -115,50 +115,50 @@
 #   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_unordered_lookup != 201811L
-#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
-#   error "__cpp_lib_node_extract should be defined in c++2a"
+#   error "__cpp_lib_node_extract should be defined in c++20"
 # endif
 # if __cpp_lib_node_extract != 201606L
-#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+#   error "__cpp_lib_node_extract should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_unordered_map_try_emplace
-#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++2a"
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++20"
 # endif
 # if __cpp_lib_unordered_map_try_emplace != 201411L
-#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++2a"
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
index 1cd59235ab82..21e960057d20 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
@@ -15,8 +15,8 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
-    __cpp_lib_generic_unordered_lookup            201811L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
+    __cpp_lib_generic_unordered_lookup            201811L [C++20]
     __cpp_lib_node_extract                        201606L [C++17]
     __cpp_lib_nonmember_container_access          201411L [C++17]
 */
@@ -31,11 +31,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_node_extract
@@ -53,11 +53,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_node_extract
@@ -78,11 +78,11 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
@@ -99,43 +99,43 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_unordered_lookup != 201811L
-#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_node_extract
-#   error "__cpp_lib_node_extract should be defined in c++2a"
+#   error "__cpp_lib_node_extract should be defined in c++20"
 # endif
 # if __cpp_lib_node_extract != 201606L
-#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+#   error "__cpp_lib_node_extract should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
index 63f755e66047..a5e1d715b307 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
@@ -15,7 +15,7 @@
 
 /*  Constant                       Value
     __cpp_lib_as_const             201510L [C++17]
-    __cpp_lib_constexpr_utility    201811L [C++2a]
+    __cpp_lib_constexpr_utility    201811L [C++20]
     __cpp_lib_exchange_function    201304L [C++14]
     __cpp_lib_integer_sequence     201304L [C++14]
     __cpp_lib_to_chars             201611L [C++17]
@@ -32,7 +32,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_exchange_function
@@ -58,7 +58,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
@@ -96,7 +96,7 @@
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
@@ -133,42 +133,42 @@
 #   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_as_const
-#   error "__cpp_lib_as_const should be defined in c++2a"
+#   error "__cpp_lib_as_const should be defined in c++20"
 # endif
 # if __cpp_lib_as_const != 201510L
-#   error "__cpp_lib_as_const should have the value 201510L in c++2a"
+#   error "__cpp_lib_as_const should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should be defined in c++2a"
+#   error "__cpp_lib_constexpr_utility should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_utility != 201811L
-#   error "__cpp_lib_constexpr_utility should have the value 201811L in c++2a"
+#   error "__cpp_lib_constexpr_utility should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
-#   error "__cpp_lib_exchange_function should be defined in c++2a"
+#   error "__cpp_lib_exchange_function should be defined in c++20"
 # endif
 # if __cpp_lib_exchange_function != 201304L
-#   error "__cpp_lib_exchange_function should have the value 201304L in c++2a"
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_integer_sequence
-#   error "__cpp_lib_integer_sequence should be defined in c++2a"
+#   error "__cpp_lib_integer_sequence should be defined in c++20"
 # endif
 # if __cpp_lib_integer_sequence != 201304L
-#   error "__cpp_lib_integer_sequence should have the value 201304L in c++2a"
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_to_chars
-#     error "__cpp_lib_to_chars should be defined in c++2a"
+#     error "__cpp_lib_to_chars should be defined in c++20"
 #   endif
 #   if __cpp_lib_to_chars != 201611L
-#     error "__cpp_lib_to_chars should have the value 201611L in c++2a"
+#     error "__cpp_lib_to_chars should have the value 201611L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_to_chars
@@ -177,12 +177,12 @@
 # endif
 
 # ifndef __cpp_lib_tuples_by_type
-#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+#   error "__cpp_lib_tuples_by_type should be defined in c++20"
 # endif
 # if __cpp_lib_tuples_by_type != 201304L
-#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
index 7a17307460d8..6e8c1ae43681 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
@@ -41,15 +41,15 @@
 #   error "__cpp_lib_variant should have the value 201606L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_variant
-#   error "__cpp_lib_variant should be defined in c++2a"
+#   error "__cpp_lib_variant should be defined in c++20"
 # endif
 # if __cpp_lib_variant != 201606L
-#   error "__cpp_lib_variant should have the value 201606L in c++2a"
+#   error "__cpp_lib_variant should have the value 201606L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
index 60bba44446c6..13e869dd205a 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
@@ -15,7 +15,7 @@
 
 /*  Constant                                      Value
     __cpp_lib_allocator_traits_is_always_equal    201411L [C++17]
-    __cpp_lib_erase_if                            202002L [C++2a]
+    __cpp_lib_erase_if                            202002L [C++20]
     __cpp_lib_incomplete_container_elements       201505L [C++17]
     __cpp_lib_nonmember_container_access          201411L [C++17]
 */
@@ -30,7 +30,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -48,7 +48,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_incomplete_container_elements
@@ -69,7 +69,7 @@
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
@@ -86,36 +86,36 @@
 #   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
-#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++20"
 # endif
 # if __cpp_lib_incomplete_container_elements != 201505L
-#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
index e37907185db1..3f5ff3cdaeaf 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
@@ -19,65 +19,65 @@
     __cpp_lib_any                                  201606L [C++17]
     __cpp_lib_apply                                201603L [C++17]
     __cpp_lib_array_constexpr                      201603L [C++17]
-                                                   201811L [C++2a]
+                                                   201811L [C++20]
     __cpp_lib_as_const                             201510L [C++17]
-    __cpp_lib_atomic_flag_test                     201907L [C++2a]
-    __cpp_lib_atomic_float                         201711L [C++2a]
+    __cpp_lib_atomic_flag_test                     201907L [C++20]
+    __cpp_lib_atomic_float                         201711L [C++20]
     __cpp_lib_atomic_is_always_lock_free           201603L [C++17]
-    __cpp_lib_atomic_lock_free_type_aliases        201907L [C++2a]
-    __cpp_lib_atomic_ref                           201806L [C++2a]
-    __cpp_lib_atomic_shared_ptr                    201711L [C++2a]
-    __cpp_lib_atomic_value_initialization          201911L [C++2a]
-    __cpp_lib_atomic_wait                          201907L [C++2a]
-    __cpp_lib_bind_front                           201811L [C++2a]
-    __cpp_lib_bit_cast                             201806L [C++2a]
+    __cpp_lib_atomic_lock_free_type_aliases        201907L [C++20]
+    __cpp_lib_atomic_ref                           201806L [C++20]
+    __cpp_lib_atomic_shared_ptr                    201711L [C++20]
+    __cpp_lib_atomic_value_initialization          201911L [C++20]
+    __cpp_lib_atomic_wait                          201907L [C++20]
+    __cpp_lib_bind_front                           201811L [C++20]
+    __cpp_lib_bit_cast                             201806L [C++20]
     __cpp_lib_bool_constant                        201505L [C++17]
     __cpp_lib_boyer_moore_searcher                 201603L [C++17]
     __cpp_lib_byte                                 201603L [C++17]
-    __cpp_lib_char8_t                              201811L [C++2a]
+    __cpp_lib_char8_t                              201811L [C++20]
     __cpp_lib_chrono                               201611L [C++17]
     __cpp_lib_chrono_udls                          201304L [C++14]
     __cpp_lib_clamp                                201603L [C++17]
     __cpp_lib_complex_udls                         201309L [C++14]
-    __cpp_lib_concepts                             201806L [C++2a]
-    __cpp_lib_constexpr_dynamic_alloc              201907L [C++2a]
-    __cpp_lib_constexpr_functional                 201907L [C++2a]
-    __cpp_lib_constexpr_numeric                    201911L [C++2a]
-    __cpp_lib_constexpr_swap_algorithms            201806L [C++2a]
-    __cpp_lib_constexpr_utility                    201811L [C++2a]
-    __cpp_lib_destroying_delete                    201806L [C++2a]
+    __cpp_lib_concepts                             201806L [C++20]
+    __cpp_lib_constexpr_dynamic_alloc              201907L [C++20]
+    __cpp_lib_constexpr_functional                 201907L [C++20]
+    __cpp_lib_constexpr_numeric                    201911L [C++20]
+    __cpp_lib_constexpr_swap_algorithms            201806L [C++20]
+    __cpp_lib_constexpr_utility                    201811L [C++20]
+    __cpp_lib_destroying_delete                    201806L [C++20]
     __cpp_lib_enable_shared_from_this              201603L [C++17]
-    __cpp_lib_endian                               201907L [C++2a]
-    __cpp_lib_erase_if                             202002L [C++2a]
+    __cpp_lib_endian                               201907L [C++20]
+    __cpp_lib_erase_if                             202002L [C++20]
     __cpp_lib_exchange_function                    201304L [C++14]
     __cpp_lib_execution                            201603L [C++17]
     __cpp_lib_filesystem                           201703L [C++17]
     __cpp_lib_gcd_lcm                              201606L [C++17]
     __cpp_lib_generic_associative_lookup           201304L [C++14]
-    __cpp_lib_generic_unordered_lookup             201811L [C++2a]
+    __cpp_lib_generic_unordered_lookup             201811L [C++20]
     __cpp_lib_hardware_interference_size           201703L [C++17]
     __cpp_lib_has_unique_object_representations    201606L [C++17]
     __cpp_lib_hypot                                201603L [C++17]
     __cpp_lib_incomplete_container_elements        201505L [C++17]
-    __cpp_lib_int_pow2                             202002L [C++2a]
+    __cpp_lib_int_pow2                             202002L [C++20]
     __cpp_lib_integer_sequence                     201304L [C++14]
     __cpp_lib_integral_constant_callable           201304L [C++14]
-    __cpp_lib_interpolate                          201902L [C++2a]
+    __cpp_lib_interpolate                          201902L [C++20]
     __cpp_lib_invoke                               201411L [C++17]
     __cpp_lib_is_aggregate                         201703L [C++17]
-    __cpp_lib_is_constant_evaluated                201811L [C++2a]
+    __cpp_lib_is_constant_evaluated                201811L [C++20]
     __cpp_lib_is_final                             201402L [C++14]
     __cpp_lib_is_invocable                         201703L [C++17]
     __cpp_lib_is_null_pointer                      201309L [C++14]
     __cpp_lib_is_swappable                         201603L [C++17]
     __cpp_lib_launder                              201606L [C++17]
-    __cpp_lib_list_remove_return_type              201806L [C++2a]
+    __cpp_lib_list_remove_return_type              201806L [C++20]
     __cpp_lib_logical_traits                       201510L [C++17]
     __cpp_lib_make_from_tuple                      201606L [C++17]
     __cpp_lib_make_reverse_iterator                201402L [C++14]
     __cpp_lib_make_unique                          201304L [C++14]
     __cpp_lib_map_try_emplace                      201411L [C++17]
-    __cpp_lib_math_constants                       201907L [C++2a]
+    __cpp_lib_math_constants                       201907L [C++20]
     __cpp_lib_math_special_functions               201603L [C++17]
     __cpp_lib_memory_resource                      201603L [C++17]
     __cpp_lib_node_extract                         201606L [C++17]
@@ -87,7 +87,7 @@
     __cpp_lib_optional                             201606L [C++17]
     __cpp_lib_parallel_algorithm                   201603L [C++17]
     __cpp_lib_quoted_string_io                     201304L [C++14]
-    __cpp_lib_ranges                               201811L [C++2a]
+    __cpp_lib_ranges                               201811L [C++20]
     __cpp_lib_raw_memory_algorithms                201606L [C++17]
     __cpp_lib_result_of_sfinae                     201210L [C++14]
     __cpp_lib_robust_nonmodifying_seq_ops          201304L [C++14]
@@ -97,11 +97,11 @@
     __cpp_lib_shared_ptr_arrays                    201611L [C++17]
     __cpp_lib_shared_ptr_weak_type                 201606L [C++17]
     __cpp_lib_shared_timed_mutex                   201402L [C++14]
-    __cpp_lib_span                                 202002L [C++2a]
+    __cpp_lib_span                                 202002L [C++20]
     __cpp_lib_string_udls                          201304L [C++14]
     __cpp_lib_string_view                          201606L [C++17]
-    __cpp_lib_three_way_comparison                 201711L [C++2a]
-    __cpp_lib_to_array                             201907L [C++2a]
+    __cpp_lib_three_way_comparison                 201711L [C++20]
+    __cpp_lib_to_array                             201907L [C++20]
     __cpp_lib_to_chars                             201611L [C++17]
     __cpp_lib_transformation_trait_aliases         201304L [C++14]
     __cpp_lib_transparent_operators                201210L [C++14]
@@ -145,11 +145,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_is_always_lock_free
@@ -157,31 +157,31 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bool_constant
@@ -197,7 +197,7 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_chrono
@@ -217,31 +217,31 @@
 # endif
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_enable_shared_from_this
@@ -249,11 +249,11 @@
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_exchange_function
@@ -277,7 +277,7 @@
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_hardware_interference_size
@@ -297,7 +297,7 @@
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_integer_sequence
@@ -309,7 +309,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_invoke
@@ -321,7 +321,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_is_final
@@ -345,7 +345,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_logical_traits
@@ -369,7 +369,7 @@
 # endif
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_math_special_functions
@@ -409,7 +409,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_raw_memory_algorithms
@@ -449,7 +449,7 @@
 # endif
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_string_udls
@@ -461,11 +461,11 @@
 # endif
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_to_chars
@@ -535,11 +535,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_is_always_lock_free
@@ -547,31 +547,31 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bool_constant
@@ -587,7 +587,7 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_chrono
@@ -613,31 +613,31 @@
 # endif
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_enable_shared_from_this
@@ -645,11 +645,11 @@
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
@@ -679,7 +679,7 @@
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_hardware_interference_size
@@ -699,7 +699,7 @@
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_integer_sequence
@@ -717,7 +717,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_invoke
@@ -729,7 +729,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_is_final
@@ -759,7 +759,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_logical_traits
@@ -789,7 +789,7 @@
 # endif
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_math_special_functions
@@ -835,7 +835,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_raw_memory_algorithms
@@ -890,7 +890,7 @@
 # endif
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_string_udls
@@ -905,11 +905,11 @@
 # endif
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_to_chars
@@ -1015,11 +1015,11 @@
 # endif
 
 # ifdef __cpp_lib_atomic_flag_test
-#   error "__cpp_lib_atomic_flag_test should not be defined before c++2a"
+#   error "__cpp_lib_atomic_flag_test should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_float
-#   error "__cpp_lib_atomic_float should not be defined before c++2a"
+#   error "__cpp_lib_atomic_float should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
@@ -1036,31 +1036,31 @@
 # endif
 
 # ifdef __cpp_lib_atomic_lock_free_type_aliases
-#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++2a"
+#   error "__cpp_lib_atomic_lock_free_type_aliases should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_ref
-#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
+#   error "__cpp_lib_atomic_ref should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_shared_ptr
-#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++2a"
+#   error "__cpp_lib_atomic_shared_ptr should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_value_initialization
-#   error "__cpp_lib_atomic_value_initialization should not be defined before c++2a"
+#   error "__cpp_lib_atomic_value_initialization should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_atomic_wait
-#   error "__cpp_lib_atomic_wait should not be defined before c++2a"
+#   error "__cpp_lib_atomic_wait should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bind_front
-#   error "__cpp_lib_bind_front should not be defined before c++2a"
+#   error "__cpp_lib_bind_front should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_bit_cast
-#   error "__cpp_lib_bit_cast should not be defined before c++2a"
+#   error "__cpp_lib_bit_cast should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_bool_constant
@@ -1091,7 +1091,7 @@
 # endif
 
 # ifdef __cpp_lib_char8_t
-#   error "__cpp_lib_char8_t should not be defined before c++2a"
+#   error "__cpp_lib_char8_t should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_chrono
@@ -1123,31 +1123,31 @@
 # endif
 
 # ifdef __cpp_lib_concepts
-#   error "__cpp_lib_concepts should not be defined before c++2a"
+#   error "__cpp_lib_concepts should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_functional should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_numeric should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_swap_algorithms
-#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should not be defined before c++2a"
+#   error "__cpp_lib_constexpr_utility should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_destroying_delete
-#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
+#   error "__cpp_lib_destroying_delete should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_enable_shared_from_this
@@ -1158,11 +1158,11 @@
 # endif
 
 # ifdef __cpp_lib_endian
-#   error "__cpp_lib_endian should not be defined before c++2a"
+#   error "__cpp_lib_endian should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should not be defined before c++2a"
+#   error "__cpp_lib_erase_if should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
@@ -1207,7 +1207,7 @@
 # endif
 
 # ifdef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -1251,7 +1251,7 @@
 # endif
 
 # ifdef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should not be defined before c++2a"
+#   error "__cpp_lib_int_pow2 should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_integer_sequence
@@ -1269,7 +1269,7 @@
 # endif
 
 # ifdef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should not be defined before c++2a"
+#   error "__cpp_lib_interpolate should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_invoke
@@ -1293,7 +1293,7 @@
 # endif
 
 # ifdef __cpp_lib_is_constant_evaluated
-#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
+#   error "__cpp_lib_is_constant_evaluated should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_is_final
@@ -1332,7 +1332,7 @@
 # endif
 
 # ifdef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
+#   error "__cpp_lib_list_remove_return_type should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_logical_traits
@@ -1371,7 +1371,7 @@
 # endif
 
 # ifdef __cpp_lib_math_constants
-#   error "__cpp_lib_math_constants should not be defined before c++2a"
+#   error "__cpp_lib_math_constants should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -1456,7 +1456,7 @@
 # endif
 
 # ifdef __cpp_lib_ranges
-#   error "__cpp_lib_ranges should not be defined before c++2a"
+#   error "__cpp_lib_ranges should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_raw_memory_algorithms
@@ -1535,7 +1535,7 @@
 # endif
 
 # ifdef __cpp_lib_span
-#   error "__cpp_lib_span should not be defined before c++2a"
+#   error "__cpp_lib_span should not be defined before c++20"
 # endif
 
 # ifndef __cpp_lib_string_udls
@@ -1553,11 +1553,11 @@
 # endif
 
 # ifdef __cpp_lib_three_way_comparison
-#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
+#   error "__cpp_lib_three_way_comparison should not be defined before c++20"
 # endif
 
 # ifdef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should not be defined before c++2a"
+#   error "__cpp_lib_to_array should not be defined before c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
@@ -1636,14 +1636,14 @@
 #   error "__cpp_lib_void_t should have the value 201411L in c++17"
 # endif
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
 # if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
 #   ifndef __cpp_lib_addressof_constexpr
-#     error "__cpp_lib_addressof_constexpr should be defined in c++2a"
+#     error "__cpp_lib_addressof_constexpr should be defined in c++20"
 #   endif
 #   if __cpp_lib_addressof_constexpr != 201603L
-#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++2a"
+#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_addressof_constexpr
@@ -1652,46 +1652,46 @@
 # endif
 
 # ifndef __cpp_lib_allocator_traits_is_always_equal
-#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++20"
 # endif
 # if __cpp_lib_allocator_traits_is_always_equal != 201411L
-#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
+#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_any
-#   error "__cpp_lib_any should be defined in c++2a"
+#   error "__cpp_lib_any should be defined in c++20"
 # endif
 # if __cpp_lib_any != 201606L
-#   error "__cpp_lib_any should have the value 201606L in c++2a"
+#   error "__cpp_lib_any should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_apply
-#   error "__cpp_lib_apply should be defined in c++2a"
+#   error "__cpp_lib_apply should be defined in c++20"
 # endif
 # if __cpp_lib_apply != 201603L
-#   error "__cpp_lib_apply should have the value 201603L in c++2a"
+#   error "__cpp_lib_apply should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_array_constexpr
-#   error "__cpp_lib_array_constexpr should be defined in c++2a"
+#   error "__cpp_lib_array_constexpr should be defined in c++20"
 # endif
 # if __cpp_lib_array_constexpr != 201811L
-#   error "__cpp_lib_array_constexpr should have the value 201811L in c++2a"
+#   error "__cpp_lib_array_constexpr should have the value 201811L in c++20"
 # endif
 
 # ifndef __cpp_lib_as_const
-#   error "__cpp_lib_as_const should be defined in c++2a"
+#   error "__cpp_lib_as_const should be defined in c++20"
 # endif
 # if __cpp_lib_as_const != 201510L
-#   error "__cpp_lib_as_const should have the value 201510L in c++2a"
+#   error "__cpp_lib_as_const should have the value 201510L in c++20"
 # endif
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_flag_test
-#     error "__cpp_lib_atomic_flag_test should be defined in c++2a"
+#     error "__cpp_lib_atomic_flag_test should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_flag_test != 201907L
-#     error "__cpp_lib_atomic_flag_test should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_flag_test should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_flag_test
@@ -1701,10 +1701,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_float
-#     error "__cpp_lib_atomic_float should be defined in c++2a"
+#     error "__cpp_lib_atomic_float should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_float != 201711L
-#     error "__cpp_lib_atomic_float should have the value 201711L in c++2a"
+#     error "__cpp_lib_atomic_float should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_float
@@ -1714,10 +1714,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_is_always_lock_free
-#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++2a"
+#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_is_always_lock_free != 201603L
-#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++2a"
+#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_is_always_lock_free
@@ -1727,10 +1727,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_lock_free_type_aliases
-#     error "__cpp_lib_atomic_lock_free_type_aliases should be defined in c++2a"
+#     error "__cpp_lib_atomic_lock_free_type_aliases should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_lock_free_type_aliases != 201907L
-#     error "__cpp_lib_atomic_lock_free_type_aliases should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_lock_free_type_aliases should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_lock_free_type_aliases
@@ -1740,10 +1740,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_ref
-#     error "__cpp_lib_atomic_ref should be defined in c++2a"
+#     error "__cpp_lib_atomic_ref should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_ref != 201806L
-#     error "__cpp_lib_atomic_ref should have the value 201806L in c++2a"
+#     error "__cpp_lib_atomic_ref should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_ref
@@ -1753,10 +1753,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_shared_ptr
-#     error "__cpp_lib_atomic_shared_ptr should be defined in c++2a"
+#     error "__cpp_lib_atomic_shared_ptr should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_shared_ptr != 201711L
-#     error "__cpp_lib_atomic_shared_ptr should have the value 201711L in c++2a"
+#     error "__cpp_lib_atomic_shared_ptr should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_shared_ptr
@@ -1766,10 +1766,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_atomic_value_initialization
-#     error "__cpp_lib_atomic_value_initialization should be defined in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_value_initialization != 201911L
-#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++2a"
+#     error "__cpp_lib_atomic_value_initialization should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_atomic_value_initialization
@@ -1779,10 +1779,10 @@
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_atomic_wait
-#     error "__cpp_lib_atomic_wait should be defined in c++2a"
+#     error "__cpp_lib_atomic_wait should be defined in c++20"
 #   endif
 #   if __cpp_lib_atomic_wait != 201907L
-#     error "__cpp_lib_atomic_wait should have the value 201907L in c++2a"
+#     error "__cpp_lib_atomic_wait should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_atomic_wait
@@ -1792,10 +1792,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_bind_front
-#     error "__cpp_lib_bind_front should be defined in c++2a"
+#     error "__cpp_lib_bind_front should be defined in c++20"
 #   endif
 #   if __cpp_lib_bind_front != 201811L
-#     error "__cpp_lib_bind_front should have the value 201811L in c++2a"
+#     error "__cpp_lib_bind_front should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_bind_front
@@ -1805,10 +1805,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_bit_cast
-#     error "__cpp_lib_bit_cast should be defined in c++2a"
+#     error "__cpp_lib_bit_cast should be defined in c++20"
 #   endif
 #   if __cpp_lib_bit_cast != 201806L
-#     error "__cpp_lib_bit_cast should have the value 201806L in c++2a"
+#     error "__cpp_lib_bit_cast should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_bit_cast
@@ -1817,18 +1817,18 @@
 # endif
 
 # ifndef __cpp_lib_bool_constant
-#   error "__cpp_lib_bool_constant should be defined in c++2a"
+#   error "__cpp_lib_bool_constant should be defined in c++20"
 # endif
 # if __cpp_lib_bool_constant != 201505L
-#   error "__cpp_lib_bool_constant should have the value 201505L in c++2a"
+#   error "__cpp_lib_bool_constant should have the value 201505L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_boyer_moore_searcher
-#     error "__cpp_lib_boyer_moore_searcher should be defined in c++2a"
+#     error "__cpp_lib_boyer_moore_searcher should be defined in c++20"
 #   endif
 #   if __cpp_lib_boyer_moore_searcher != 201603L
-#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++2a"
+#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_boyer_moore_searcher
@@ -1837,18 +1837,18 @@
 # endif
 
 # ifndef __cpp_lib_byte
-#   error "__cpp_lib_byte should be defined in c++2a"
+#   error "__cpp_lib_byte should be defined in c++20"
 # endif
 # if __cpp_lib_byte != 201603L
-#   error "__cpp_lib_byte should have the value 201603L in c++2a"
+#   error "__cpp_lib_byte should have the value 201603L in c++20"
 # endif
 
 # if defined(__cpp_char8_t)
 #   ifndef __cpp_lib_char8_t
-#     error "__cpp_lib_char8_t should be defined in c++2a"
+#     error "__cpp_lib_char8_t should be defined in c++20"
 #   endif
 #   if __cpp_lib_char8_t != 201811L
-#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
+#     error "__cpp_lib_char8_t should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_char8_t
@@ -1857,39 +1857,39 @@
 # endif
 
 # ifndef __cpp_lib_chrono
-#   error "__cpp_lib_chrono should be defined in c++2a"
+#   error "__cpp_lib_chrono should be defined in c++20"
 # endif
 # if __cpp_lib_chrono != 201611L
-#   error "__cpp_lib_chrono should have the value 201611L in c++2a"
+#   error "__cpp_lib_chrono should have the value 201611L in c++20"
 # endif
 
 # ifndef __cpp_lib_chrono_udls
-#   error "__cpp_lib_chrono_udls should be defined in c++2a"
+#   error "__cpp_lib_chrono_udls should be defined in c++20"
 # endif
 # if __cpp_lib_chrono_udls != 201304L
-#   error "__cpp_lib_chrono_udls should have the value 201304L in c++2a"
+#   error "__cpp_lib_chrono_udls should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_clamp
-#   error "__cpp_lib_clamp should be defined in c++2a"
+#   error "__cpp_lib_clamp should be defined in c++20"
 # endif
 # if __cpp_lib_clamp != 201603L
-#   error "__cpp_lib_clamp should have the value 201603L in c++2a"
+#   error "__cpp_lib_clamp should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_complex_udls
-#   error "__cpp_lib_complex_udls should be defined in c++2a"
+#   error "__cpp_lib_complex_udls should be defined in c++20"
 # endif
 # if __cpp_lib_complex_udls != 201309L
-#   error "__cpp_lib_complex_udls should have the value 201309L in c++2a"
+#   error "__cpp_lib_complex_udls should have the value 201309L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_concepts
-#     error "__cpp_lib_concepts should be defined in c++2a"
+#     error "__cpp_lib_concepts should be defined in c++20"
 #   endif
 #   if __cpp_lib_concepts != 201806L
-#     error "__cpp_lib_concepts should have the value 201806L in c++2a"
+#     error "__cpp_lib_concepts should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_concepts
@@ -1898,32 +1898,32 @@
 # endif
 
 # ifndef __cpp_lib_constexpr_dynamic_alloc
-#   error "__cpp_lib_constexpr_dynamic_alloc should be defined in c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_dynamic_alloc != 201907L
-#   error "__cpp_lib_constexpr_dynamic_alloc should have the value 201907L in c++2a"
+#   error "__cpp_lib_constexpr_dynamic_alloc should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_constexpr_functional
-#   error "__cpp_lib_constexpr_functional should be defined in c++2a"
+#   error "__cpp_lib_constexpr_functional should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_functional != 201907L
-#   error "__cpp_lib_constexpr_functional should have the value 201907L in c++2a"
+#   error "__cpp_lib_constexpr_functional should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_constexpr_numeric
-#   error "__cpp_lib_constexpr_numeric should be defined in c++2a"
+#   error "__cpp_lib_constexpr_numeric should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_numeric != 201911L
-#   error "__cpp_lib_constexpr_numeric should have the value 201911L in c++2a"
+#   error "__cpp_lib_constexpr_numeric should have the value 201911L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_constexpr_swap_algorithms
-#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++2a"
+#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++20"
 #   endif
 #   if __cpp_lib_constexpr_swap_algorithms != 201806L
-#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++2a"
+#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_constexpr_swap_algorithms
@@ -1932,18 +1932,18 @@
 # endif
 
 # ifndef __cpp_lib_constexpr_utility
-#   error "__cpp_lib_constexpr_utility should be defined in c++2a"
+#   error "__cpp_lib_constexpr_utility should be defined in c++20"
 # endif
 # if __cpp_lib_constexpr_utility != 201811L
-#   error "__cpp_lib_constexpr_utility should have the value 201811L in c++2a"
+#   error "__cpp_lib_constexpr_utility should have the value 201811L in c++20"
 # endif
 
 # if TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
 #   ifndef __cpp_lib_destroying_delete
-#     error "__cpp_lib_destroying_delete should be defined in c++2a"
+#     error "__cpp_lib_destroying_delete should be defined in c++20"
 #   endif
 #   if __cpp_lib_destroying_delete != 201806L
-#     error "__cpp_lib_destroying_delete should have the value 201806L in c++2a"
+#     error "__cpp_lib_destroying_delete should have the value 201806L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_destroying_delete
@@ -1952,39 +1952,39 @@
 # endif
 
 # ifndef __cpp_lib_enable_shared_from_this
-#   error "__cpp_lib_enable_shared_from_this should be defined in c++2a"
+#   error "__cpp_lib_enable_shared_from_this should be defined in c++20"
 # endif
 # if __cpp_lib_enable_shared_from_this != 201603L
-#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
+#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_endian
-#   error "__cpp_lib_endian should be defined in c++2a"
+#   error "__cpp_lib_endian should be defined in c++20"
 # endif
 # if __cpp_lib_endian != 201907L
-#   error "__cpp_lib_endian should have the value 201907L in c++2a"
+#   error "__cpp_lib_endian should have the value 201907L in c++20"
 # endif
 
 # ifndef __cpp_lib_erase_if
-#   error "__cpp_lib_erase_if should be defined in c++2a"
+#   error "__cpp_lib_erase_if should be defined in c++20"
 # endif
 # if __cpp_lib_erase_if != 202002L
-#   error "__cpp_lib_erase_if should have the value 202002L in c++2a"
+#   error "__cpp_lib_erase_if should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_exchange_function
-#   error "__cpp_lib_exchange_function should be defined in c++2a"
+#   error "__cpp_lib_exchange_function should be defined in c++20"
 # endif
 # if __cpp_lib_exchange_function != 201304L
-#   error "__cpp_lib_exchange_function should have the value 201304L in c++2a"
+#   error "__cpp_lib_exchange_function should have the value 201304L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_execution
-#     error "__cpp_lib_execution should be defined in c++2a"
+#     error "__cpp_lib_execution should be defined in c++20"
 #   endif
 #   if __cpp_lib_execution != 201603L
-#     error "__cpp_lib_execution should have the value 201603L in c++2a"
+#     error "__cpp_lib_execution should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_execution
@@ -1993,39 +1993,39 @@
 # endif
 
 # ifndef __cpp_lib_filesystem
-#   error "__cpp_lib_filesystem should be defined in c++2a"
+#   error "__cpp_lib_filesystem should be defined in c++20"
 # endif
 # if __cpp_lib_filesystem != 201703L
-#   error "__cpp_lib_filesystem should have the value 201703L in c++2a"
+#   error "__cpp_lib_filesystem should have the value 201703L in c++20"
 # endif
 
 # ifndef __cpp_lib_gcd_lcm
-#   error "__cpp_lib_gcd_lcm should be defined in c++2a"
+#   error "__cpp_lib_gcd_lcm should be defined in c++20"
 # endif
 # if __cpp_lib_gcd_lcm != 201606L
-#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++2a"
+#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_associative_lookup
-#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_associative_lookup != 201304L
-#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
+#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_generic_unordered_lookup
-#   error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should be defined in c++20"
 # endif
 # if __cpp_lib_generic_unordered_lookup != 201811L
-#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
+#   error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_hardware_interference_size
-#     error "__cpp_lib_hardware_interference_size should be defined in c++2a"
+#     error "__cpp_lib_hardware_interference_size should be defined in c++20"
 #   endif
 #   if __cpp_lib_hardware_interference_size != 201703L
-#     error "__cpp_lib_hardware_interference_size should have the value 201703L in c++2a"
+#     error "__cpp_lib_hardware_interference_size should have the value 201703L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_hardware_interference_size
@@ -2035,10 +2035,10 @@
 
 # if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
 #   ifndef __cpp_lib_has_unique_object_representations
-#     error "__cpp_lib_has_unique_object_representations should be defined in c++2a"
+#     error "__cpp_lib_has_unique_object_representations should be defined in c++20"
 #   endif
 #   if __cpp_lib_has_unique_object_representations != 201606L
-#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++2a"
+#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_has_unique_object_representations
@@ -2047,60 +2047,60 @@
 # endif
 
 # ifndef __cpp_lib_hypot
-#   error "__cpp_lib_hypot should be defined in c++2a"
+#   error "__cpp_lib_hypot should be defined in c++20"
 # endif
 # if __cpp_lib_hypot != 201603L
-#   error "__cpp_lib_hypot should have the value 201603L in c++2a"
+#   error "__cpp_lib_hypot should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_incomplete_container_elements
-#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should be defined in c++20"
 # endif
 # if __cpp_lib_incomplete_container_elements != 201505L
-#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
+#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++20"
 # endif
 
 # ifndef __cpp_lib_int_pow2
-#   error "__cpp_lib_int_pow2 should be defined in c++2a"
+#   error "__cpp_lib_int_pow2 should be defined in c++20"
 # endif
 # if __cpp_lib_int_pow2 != 202002L
-#   error "__cpp_lib_int_pow2 should have the value 202002L in c++2a"
+#   error "__cpp_lib_int_pow2 should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_integer_sequence
-#   error "__cpp_lib_integer_sequence should be defined in c++2a"
+#   error "__cpp_lib_integer_sequence should be defined in c++20"
 # endif
 # if __cpp_lib_integer_sequence != 201304L
-#   error "__cpp_lib_integer_sequence should have the value 201304L in c++2a"
+#   error "__cpp_lib_integer_sequence should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_integral_constant_callable
-#   error "__cpp_lib_integral_constant_callable should be defined in c++2a"
+#   error "__cpp_lib_integral_constant_callable should be defined in c++20"
 # endif
 # if __cpp_lib_integral_constant_callable != 201304L
-#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++2a"
+#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_interpolate
-#   error "__cpp_lib_interpolate should be defined in c++2a"
+#   error "__cpp_lib_interpolate should be defined in c++20"
 # endif
 # if __cpp_lib_interpolate != 201902L
-#   error "__cpp_lib_interpolate should have the value 201902L in c++2a"
+#   error "__cpp_lib_interpolate should have the value 201902L in c++20"
 # endif
 
 # ifndef __cpp_lib_invoke
-#   error "__cpp_lib_invoke should be defined in c++2a"
+#   error "__cpp_lib_invoke should be defined in c++20"
 # endif
 # if __cpp_lib_invoke != 201411L
-#   error "__cpp_lib_invoke should have the value 201411L in c++2a"
+#   error "__cpp_lib_invoke should have the value 201411L in c++20"
 # endif
 
 # if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
 #   ifndef __cpp_lib_is_aggregate
-#     error "__cpp_lib_is_aggregate should be defined in c++2a"
+#     error "__cpp_lib_is_aggregate should be defined in c++20"
 #   endif
 #   if __cpp_lib_is_aggregate != 201703L
-#     error "__cpp_lib_is_aggregate should have the value 201703L in c++2a"
+#     error "__cpp_lib_is_aggregate should have the value 201703L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_is_aggregate
@@ -2110,10 +2110,10 @@
 
 # if TEST_HAS_BUILTIN(__builtin_is_constant_evaluated) || TEST_GCC_VER >= 900
 #   ifndef __cpp_lib_is_constant_evaluated
-#     error "__cpp_lib_is_constant_evaluated should be defined in c++2a"
+#     error "__cpp_lib_is_constant_evaluated should be defined in c++20"
 #   endif
 #   if __cpp_lib_is_constant_evaluated != 201811L
-#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++2a"
+#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_is_constant_evaluated
@@ -2122,88 +2122,88 @@
 # endif
 
 # ifndef __cpp_lib_is_final
-#   error "__cpp_lib_is_final should be defined in c++2a"
+#   error "__cpp_lib_is_final should be defined in c++20"
 # endif
 # if __cpp_lib_is_final != 201402L
-#   error "__cpp_lib_is_final should have the value 201402L in c++2a"
+#   error "__cpp_lib_is_final should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_invocable
-#   error "__cpp_lib_is_invocable should be defined in c++2a"
+#   error "__cpp_lib_is_invocable should be defined in c++20"
 # endif
 # if __cpp_lib_is_invocable != 201703L
-#   error "__cpp_lib_is_invocable should have the value 201703L in c++2a"
+#   error "__cpp_lib_is_invocable should have the value 201703L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_null_pointer
-#   error "__cpp_lib_is_null_pointer should be defined in c++2a"
+#   error "__cpp_lib_is_null_pointer should be defined in c++20"
 # endif
 # if __cpp_lib_is_null_pointer != 201309L
-#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++2a"
+#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++20"
 # endif
 
 # ifndef __cpp_lib_is_swappable
-#   error "__cpp_lib_is_swappable should be defined in c++2a"
+#   error "__cpp_lib_is_swappable should be defined in c++20"
 # endif
 # if __cpp_lib_is_swappable != 201603L
-#   error "__cpp_lib_is_swappable should have the value 201603L in c++2a"
+#   error "__cpp_lib_is_swappable should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_launder
-#   error "__cpp_lib_launder should be defined in c++2a"
+#   error "__cpp_lib_launder should be defined in c++20"
 # endif
 # if __cpp_lib_launder != 201606L
-#   error "__cpp_lib_launder should have the value 201606L in c++2a"
+#   error "__cpp_lib_launder should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_list_remove_return_type
-#   error "__cpp_lib_list_remove_return_type should be defined in c++2a"
+#   error "__cpp_lib_list_remove_return_type should be defined in c++20"
 # endif
 # if __cpp_lib_list_remove_return_type != 201806L
-#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
+#   error "__cpp_lib_list_remove_return_type should have the value 201806L in c++20"
 # endif
 
 # ifndef __cpp_lib_logical_traits
-#   error "__cpp_lib_logical_traits should be defined in c++2a"
+#   error "__cpp_lib_logical_traits should be defined in c++20"
 # endif
 # if __cpp_lib_logical_traits != 201510L
-#   error "__cpp_lib_logical_traits should have the value 201510L in c++2a"
+#   error "__cpp_lib_logical_traits should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_from_tuple
-#   error "__cpp_lib_make_from_tuple should be defined in c++2a"
+#   error "__cpp_lib_make_from_tuple should be defined in c++20"
 # endif
 # if __cpp_lib_make_from_tuple != 201606L
-#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++2a"
+#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_reverse_iterator
-#   error "__cpp_lib_make_reverse_iterator should be defined in c++2a"
+#   error "__cpp_lib_make_reverse_iterator should be defined in c++20"
 # endif
 # if __cpp_lib_make_reverse_iterator != 201402L
-#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2a"
+#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_make_unique
-#   error "__cpp_lib_make_unique should be defined in c++2a"
+#   error "__cpp_lib_make_unique should be defined in c++20"
 # endif
 # if __cpp_lib_make_unique != 201304L
-#   error "__cpp_lib_make_unique should have the value 201304L in c++2a"
+#   error "__cpp_lib_make_unique should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_map_try_emplace
-#   error "__cpp_lib_map_try_emplace should be defined in c++2a"
+#   error "__cpp_lib_map_try_emplace should be defined in c++20"
 # endif
 # if __cpp_lib_map_try_emplace != 201411L
-#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++2a"
+#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++20"
 # endif
 
 # if defined(__cpp_concepts) && __cpp_concepts >= 201811L
 #   ifndef __cpp_lib_math_constants
-#     error "__cpp_lib_math_constants should be defined in c++2a"
+#     error "__cpp_lib_math_constants should be defined in c++20"
 #   endif
 #   if __cpp_lib_math_constants != 201907L
-#     error "__cpp_lib_math_constants should have the value 201907L in c++2a"
+#     error "__cpp_lib_math_constants should have the value 201907L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_math_constants
@@ -2213,10 +2213,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_math_special_functions
-#     error "__cpp_lib_math_special_functions should be defined in c++2a"
+#     error "__cpp_lib_math_special_functions should be defined in c++20"
 #   endif
 #   if __cpp_lib_math_special_functions != 201603L
-#     error "__cpp_lib_math_special_functions should have the value 201603L in c++2a"
+#     error "__cpp_lib_math_special_functions should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_math_special_functions
@@ -2226,10 +2226,10 @@
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_memory_resource
-#     error "__cpp_lib_memory_resource should be defined in c++2a"
+#     error "__cpp_lib_memory_resource should be defined in c++20"
 #   endif
 #   if __cpp_lib_memory_resource != 201603L
-#     error "__cpp_lib_memory_resource should have the value 201603L in c++2a"
+#     error "__cpp_lib_memory_resource should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_memory_resource
@@ -2238,46 +2238,46 @@
 # endif
 
 # ifndef __cpp_lib_node_extract
-#   error "__cpp_lib_node_extract should be defined in c++2a"
+#   error "__cpp_lib_node_extract should be defined in c++20"
 # endif
 # if __cpp_lib_node_extract != 201606L
-#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
+#   error "__cpp_lib_node_extract should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_nonmember_container_access
-#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
+#   error "__cpp_lib_nonmember_container_access should be defined in c++20"
 # endif
 # if __cpp_lib_nonmember_container_access != 201411L
-#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
+#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_not_fn
-#   error "__cpp_lib_not_fn should be defined in c++2a"
+#   error "__cpp_lib_not_fn should be defined in c++20"
 # endif
 # if __cpp_lib_not_fn != 201603L
-#   error "__cpp_lib_not_fn should have the value 201603L in c++2a"
+#   error "__cpp_lib_not_fn should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_null_iterators
-#   error "__cpp_lib_null_iterators should be defined in c++2a"
+#   error "__cpp_lib_null_iterators should be defined in c++20"
 # endif
 # if __cpp_lib_null_iterators != 201304L
-#   error "__cpp_lib_null_iterators should have the value 201304L in c++2a"
+#   error "__cpp_lib_null_iterators should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_optional
-#   error "__cpp_lib_optional should be defined in c++2a"
+#   error "__cpp_lib_optional should be defined in c++20"
 # endif
 # if __cpp_lib_optional != 201606L
-#   error "__cpp_lib_optional should have the value 201606L in c++2a"
+#   error "__cpp_lib_optional should have the value 201606L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_parallel_algorithm
-#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
+#     error "__cpp_lib_parallel_algorithm should be defined in c++20"
 #   endif
 #   if __cpp_lib_parallel_algorithm != 201603L
-#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
+#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_parallel_algorithm
@@ -2286,18 +2286,18 @@
 # endif
 
 # ifndef __cpp_lib_quoted_string_io
-#   error "__cpp_lib_quoted_string_io should be defined in c++2a"
+#   error "__cpp_lib_quoted_string_io should be defined in c++20"
 # endif
 # if __cpp_lib_quoted_string_io != 201304L
-#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++2a"
+#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_ranges
-#     error "__cpp_lib_ranges should be defined in c++2a"
+#     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
 #   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
+#     error "__cpp_lib_ranges should have the value 201811L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -2306,46 +2306,46 @@
 # endif
 
 # ifndef __cpp_lib_raw_memory_algorithms
-#   error "__cpp_lib_raw_memory_algorithms should be defined in c++2a"
+#   error "__cpp_lib_raw_memory_algorithms should be defined in c++20"
 # endif
 # if __cpp_lib_raw_memory_algorithms != 201606L
-#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++2a"
+#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_result_of_sfinae
-#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
+#   error "__cpp_lib_result_of_sfinae should be defined in c++20"
 # endif
 # if __cpp_lib_result_of_sfinae != 201210L
-#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
+#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++20"
 # endif
 
 # ifndef __cpp_lib_robust_nonmodifying_seq_ops
-#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++2a"
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++20"
 # endif
 # if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
-#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++2a"
+#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_sample
-#   error "__cpp_lib_sample should be defined in c++2a"
+#   error "__cpp_lib_sample should be defined in c++20"
 # endif
 # if __cpp_lib_sample != 201603L
-#   error "__cpp_lib_sample should have the value 201603L in c++2a"
+#   error "__cpp_lib_sample should have the value 201603L in c++20"
 # endif
 
 # ifndef __cpp_lib_scoped_lock
-#   error "__cpp_lib_scoped_lock should be defined in c++2a"
+#   error "__cpp_lib_scoped_lock should be defined in c++20"
 # endif
 # if __cpp_lib_scoped_lock != 201703L
-#   error "__cpp_lib_scoped_lock should have the value 201703L in c++2a"
+#   error "__cpp_lib_scoped_lock should have the value 201703L in c++20"
 # endif
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_shared_mutex
-#     error "__cpp_lib_shared_mutex should be defined in c++2a"
+#     error "__cpp_lib_shared_mutex should be defined in c++20"
 #   endif
 #   if __cpp_lib_shared_mutex != 201505L
-#     error "__cpp_lib_shared_mutex should have the value 201505L in c++2a"
+#     error "__cpp_lib_shared_mutex should have the value 201505L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_shared_mutex
@@ -2354,25 +2354,25 @@
 # endif
 
 # ifndef __cpp_lib_shared_ptr_arrays
-#   error "__cpp_lib_shared_ptr_arrays should be defined in c++2a"
+#   error "__cpp_lib_shared_ptr_arrays should be defined in c++20"
 # endif
 # if __cpp_lib_shared_ptr_arrays != 201611L
-#   error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++2a"
+#   error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++20"
 # endif
 
 # ifndef __cpp_lib_shared_ptr_weak_type
-#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++2a"
+#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++20"
 # endif
 # if __cpp_lib_shared_ptr_weak_type != 201606L
-#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2a"
+#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++20"
 # endif
 
 # if !defined(_LIBCPP_HAS_NO_THREADS)
 #   ifndef __cpp_lib_shared_timed_mutex
-#     error "__cpp_lib_shared_timed_mutex should be defined in c++2a"
+#     error "__cpp_lib_shared_timed_mutex should be defined in c++20"
 #   endif
 #   if __cpp_lib_shared_timed_mutex != 201402L
-#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++2a"
+#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++20"
 #   endif
 # else
 #   ifdef __cpp_lib_shared_timed_mutex
@@ -2381,32 +2381,32 @@
 # endif
 
 # ifndef __cpp_lib_span
-#   error "__cpp_lib_span should be defined in c++2a"
+#   error "__cpp_lib_span should be defined in c++20"
 # endif
 # if __cpp_lib_span != 202002L
-#   error "__cpp_lib_span should have the value 202002L in c++2a"
+#   error "__cpp_lib_span should have the value 202002L in c++20"
 # endif
 
 # ifndef __cpp_lib_string_udls
-#   error "__cpp_lib_string_udls should be defined in c++2a"
+#   error "__cpp_lib_string_udls should be defined in c++20"
 # endif
 # if __cpp_lib_string_udls != 201304L
-#   error "__cpp_lib_string_udls should have the value 201304L in c++2a"
+#   error "__cpp_lib_string_udls should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_string_view
-#   error "__cpp_lib_string_view should be defined in c++2a"
+#   error "__cpp_lib_string_view should be defined in c++20"
 # endif
 # if __cpp_lib_string_view != 201606L
-#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
+#   error "__cpp_lib_string_view should have the value 201606L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_three_way_comparison
-#     error "__cpp_lib_three_way_comparison should be defined in c++2a"
+#     error "__cpp_lib_three_way_comparison should be defined in c++20"
 #   endif
 #   if __cpp_lib_three_way_comparison != 201711L
-#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++2a"
+#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_three_way_comparison
@@ -2415,18 +2415,18 @@
 # endif
 
 # ifndef __cpp_lib_to_array
-#   error "__cpp_lib_to_array should be defined in c++2a"
+#   error "__cpp_lib_to_array should be defined in c++20"
 # endif
 # if __cpp_lib_to_array != 201907L
-#   error "__cpp_lib_to_array should have the value 201907L in c++2a"
+#   error "__cpp_lib_to_array should have the value 201907L in c++20"
 # endif
 
 # if !defined(_LIBCPP_VERSION)
 #   ifndef __cpp_lib_to_chars
-#     error "__cpp_lib_to_chars should be defined in c++2a"
+#     error "__cpp_lib_to_chars should be defined in c++20"
 #   endif
 #   if __cpp_lib_to_chars != 201611L
-#     error "__cpp_lib_to_chars should have the value 201611L in c++2a"
+#     error "__cpp_lib_to_chars should have the value 201611L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_to_chars
@@ -2435,68 +2435,68 @@
 # endif
 
 # ifndef __cpp_lib_transformation_trait_aliases
-#   error "__cpp_lib_transformation_trait_aliases should be defined in c++2a"
+#   error "__cpp_lib_transformation_trait_aliases should be defined in c++20"
 # endif
 # if __cpp_lib_transformation_trait_aliases != 201304L
-#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++2a"
+#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_transparent_operators
-#   error "__cpp_lib_transparent_operators should be defined in c++2a"
+#   error "__cpp_lib_transparent_operators should be defined in c++20"
 # endif
 # if __cpp_lib_transparent_operators != 201510L
-#   error "__cpp_lib_transparent_operators should have the value 201510L in c++2a"
+#   error "__cpp_lib_transparent_operators should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_tuple_element_t
-#   error "__cpp_lib_tuple_element_t should be defined in c++2a"
+#   error "__cpp_lib_tuple_element_t should be defined in c++20"
 # endif
 # if __cpp_lib_tuple_element_t != 201402L
-#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++2a"
+#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++20"
 # endif
 
 # ifndef __cpp_lib_tuples_by_type
-#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
+#   error "__cpp_lib_tuples_by_type should be defined in c++20"
 # endif
 # if __cpp_lib_tuples_by_type != 201304L
-#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
+#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++20"
 # endif
 
 # ifndef __cpp_lib_type_trait_variable_templates
-#   error "__cpp_lib_type_trait_variable_templates should be defined in c++2a"
+#   error "__cpp_lib_type_trait_variable_templates should be defined in c++20"
 # endif
 # if __cpp_lib_type_trait_variable_templates != 201510L
-#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++2a"
+#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++20"
 # endif
 
 # ifndef __cpp_lib_uncaught_exceptions
-#   error "__cpp_lib_uncaught_exceptions should be defined in c++2a"
+#   error "__cpp_lib_uncaught_exceptions should be defined in c++20"
 # endif
 # if __cpp_lib_uncaught_exceptions != 201411L
-#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++2a"
+#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_unordered_map_try_emplace
-#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++2a"
+#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++20"
 # endif
 # if __cpp_lib_unordered_map_try_emplace != 201411L
-#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++2a"
+#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++20"
 # endif
 
 # ifndef __cpp_lib_variant
-#   error "__cpp_lib_variant should be defined in c++2a"
+#   error "__cpp_lib_variant should be defined in c++20"
 # endif
 # if __cpp_lib_variant != 201606L
-#   error "__cpp_lib_variant should have the value 201606L in c++2a"
+#   error "__cpp_lib_variant should have the value 201606L in c++20"
 # endif
 
 # ifndef __cpp_lib_void_t
-#   error "__cpp_lib_void_t should be defined in c++2a"
+#   error "__cpp_lib_void_t should be defined in c++20"
 # endif
 # if __cpp_lib_void_t != 201411L
-#   error "__cpp_lib_void_t should have the value 201411L in c++2a"
+#   error "__cpp_lib_void_t should have the value 201411L in c++20"
 # endif
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) { return 0; }

diff  --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
index f50f48fe046b..5f8ac2e8b8aa 100644
--- a/libcxx/test/support/test_macros.h
+++ b/libcxx/test/support/test_macros.h
@@ -101,6 +101,8 @@
 # define TEST_STD_VER 14
 #elif __cplusplus <= 201703L
 # define TEST_STD_VER 17
+#elif __cplusplus <= 202002L
+# define TEST_STD_VER 20
 #else
 # define TEST_STD_VER 99    // greater than current standard
 // This is deliberately 
diff erent than _LIBCPP_STD_VER to discourage matching them up.

diff  --git a/libcxx/utils/ci/buildkite-pipeline.yml b/libcxx/utils/ci/buildkite-pipeline.yml
index d10c464f9d55..2a469f30002d 100644
--- a/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/libcxx/utils/ci/buildkite-pipeline.yml
@@ -64,7 +64,7 @@ steps:
           limit: 2
 
   - label: "C++20"
-    command: "libcxx/utils/ci/run-buildbot generic-cxx2a"
+    command: "libcxx/utils/ci/run-buildbot generic-cxx20"
     artifact_paths:
       - "**/test-results.xml"
       - "**/*.abilist"
@@ -186,7 +186,7 @@ steps:
           limit: 2
 
   - label: "MacOS C++20"
-    command: "libcxx/utils/ci/run-buildbot generic-cxx2a"
+    command: "libcxx/utils/ci/run-buildbot generic-cxx20"
     artifact_paths:
       - "**/test-results.xml"
       - "**/*.abilist"

diff  --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
index 20dca5917e79..3a394de4f2d0 100755
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -137,11 +137,11 @@ generic-cxx17)
     check-cxx-cxxabi
     check-abi-list
 ;;
-generic-cxx2a)
+generic-cxx20)
     export CC=clang
     export CXX=clang++
     clean
-    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx2a.cmake"
+    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx20.cmake"
     check-cxx-cxxabi
     check-abi-list
 ;;

diff  --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index 091fea431384..2302dc4ec505 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -289,7 +289,7 @@ def add_version_header(tc):
     "headers": ["unordered_map"],
   }, {
     "name": "__cpp_lib_array_constexpr",
-    "values": { "c++17": int(201603), "c++2a": int(201811) },
+    "values": { "c++17": int(201603), "c++20": int(201811) },
     "headers": ["iterator", "array"],
   }, {
     "name": "__cpp_lib_nonmember_container_access",
@@ -328,22 +328,22 @@ def add_version_header(tc):
     "values": { "c++17": int(201703) },
     "headers": ["mutex"],
   },
-  # C++2a
+  # C++20
   {
     "name": "__cpp_lib_char8_t",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["atomic", "filesystem", "istream", "limits", "locale", "ostream",
                 "string", "string_view"],
     "depends": "defined(__cpp_char8_t)",
     "internal_depends": "!defined(_LIBCPP_NO_HAS_CHAR8_T)",
   }, {
     "name": "__cpp_lib_erase_if",
-    "values": { "c++2a": int(202002) },
+    "values": { "c++20": int(202002) },
     "headers": ["string", "deque", "forward_list", "list", "vector", "map",
                 "set", "unordered_map", "unordered_set"]
   }, {
     "name": "__cpp_lib_destroying_delete",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["new"],
     "depends":
       "TEST_STD_VER > 17"
@@ -355,135 +355,135 @@ def add_version_header(tc):
       " && __cpp_impl_destroying_delete >= 201806L",
   }, {
     "name": "__cpp_lib_three_way_comparison",
-    "values": { "c++2a": int(201711) },
+    "values": { "c++20": int(201711) },
     "headers": ["compare"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_concepts",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["concepts"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_constexpr_swap_algorithms",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["algorithm"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_constexpr_functional",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["functional"],
   }, {
     "name": "__cpp_lib_constexpr_numeric",
-    "values": { "c++2a": int(201911) },
+    "values": { "c++20": int(201911) },
     "headers": ["numeric"],
   }, {
     "name": "__cpp_lib_bind_front",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["functional"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_is_constant_evaluated",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["type_traits"],
     "depends": "TEST_HAS_BUILTIN(__builtin_is_constant_evaluated) || TEST_GCC_VER >= 900",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED)",
   }, {
     "name": "__cpp_lib_list_remove_return_type",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["forward_list", "list"],
   }, {
     "name": "__cpp_lib_generic_unordered_lookup",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["unordered_map", "unordered_set"],
   }, {
     "name": "__cpp_lib_ranges",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["algorithm", "functional", "iterator", "memory", "ranges"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_bit_cast",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["bit"],
     "unimplemented": True,
   }, {
     "name": "__cpp_lib_atomic_ref",
-    "values": { "c++2a": int(201806) },
+    "values": { "c++20": int(201806) },
     "headers": ["atomic"],
     "unimplemented": True,
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_int_pow2",
-    "values": { "c++2a": int(202002) },
+    "values": { "c++20": int(202002) },
     "headers": ["bit"],
   }, {
     "name": "__cpp_lib_interpolate",
-    "values": { "c++2a": int(201902) },
+    "values": { "c++20": int(201902) },
     "headers": ["numeric"],
   }, {
     "name": "__cpp_lib_endian",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["bit"],
   }, {
     "name": "__cpp_lib_to_array",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["array"],
   }, {
     "name": "__cpp_lib_span",
-    "values": { "c++2a": int(202002) },
+    "values": { "c++20": int(202002) },
     "headers": ["span"],
   }, {
     "name": "__cpp_lib_math_constants",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["numbers"],
     "depends": "defined(__cpp_concepts) && __cpp_concepts >= 201811L",
     "internal_depends": "defined(__cpp_concepts) && __cpp_concepts >= 201811L",
   }, {
     "name": "__cpp_lib_constexpr_utility",
-    "values": { "c++2a": int(201811) },
+    "values": { "c++20": int(201811) },
     "headers": ["utility"],
   }, {
     "name": "__cpp_lib_atomic_flag_test",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["atomic"],
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_atomic_lock_free_type_aliases",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["atomic"],
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_atomic_wait",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["atomic"],
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_atomic_float",
-    "values": { "c++2a": int(201711) },
+    "values": { "c++20": int(201711) },
     "headers": ["atomic"],
     "unimplemented": True,
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_atomic_shared_ptr",
-    "values": { "c++2a": int(201711) },
+    "values": { "c++20": int(201711) },
     "headers": ["atomic"],
     "unimplemented": True,
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_atomic_value_initialization",
-    "values": { "c++2a": int(201911) },
+    "values": { "c++20": int(201911) },
     "headers": ["atomic", "memory"],
     "unimplemented": True,
     "depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
     "internal_depends": "!defined(_LIBCPP_HAS_NO_THREADS)",
   }, {
     "name": "__cpp_lib_constexpr_dynamic_alloc",
-    "values": { "c++2a": int(201907) },
+    "values": { "c++20": int(201907) },
     "headers": ["memory"]
   },
 ]], key=lambda tc: tc["name"])
@@ -506,7 +506,7 @@ def add_version_header(tc):
 }
 
 def get_std_dialects():
-  std_dialects = ['c++14', 'c++17', 'c++2a']
+  std_dialects = ['c++14', 'c++17', 'c++20']
   return list(std_dialects)
 
 def get_first_std(d):
@@ -656,7 +656,7 @@ def produce_version_header():
 #endif
 
 #if _LIBCPP_STD_VER > 17
-{cxx2a_macros}
+{cxx20_macros}
 #endif
 
 #endif // _LIBCPP_VERSIONH
@@ -666,7 +666,7 @@ def produce_version_header():
       synopsis=produce_version_synopsis().strip(),
       cxx14_macros=produce_macros_definition_for_std('c++14').strip(),
       cxx17_macros=produce_macros_definition_for_std('c++17').strip(),
-      cxx2a_macros=produce_macros_definition_for_std('c++2a').strip())
+      cxx20_macros=produce_macros_definition_for_std('c++20').strip())
 
   version_header_path = os.path.join(include_path, 'version')
   with open(version_header_path, 'w', newline='\n') as f:
@@ -798,11 +798,11 @@ def produce_tests():
 
 {cxx17_tests}
 
-#elif TEST_STD_VER > 17
+#elif TEST_STD_VER == 20
 
-{cxx2a_tests}
+{cxx20_tests}
 
-#endif // TEST_STD_VER > 17
+#endif // TEST_STD_VER == 20
 
 int main(int, char**) {{ return 0; }}
 """.format(script_name=script_name,
@@ -812,7 +812,7 @@ def produce_tests():
            cxx11_tests=generate_std_test(test_list, 'c++11').strip(),
            cxx14_tests=generate_std_test(test_list, 'c++14').strip(),
            cxx17_tests=generate_std_test(test_list, 'c++17').strip(),
-           cxx2a_tests=generate_std_test(test_list, 'c++2a').strip())
+           cxx20_tests=generate_std_test(test_list, 'c++20').strip())
     test_name = "{header}.version.pass.cpp".format(header=h)
     out_path = os.path.join(macro_test_path, test_name)
     with open(out_path, 'w', newline='\n') as f:


        


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