__cpp_lib_concepts 202002L [C++20]
*/
#include <concepts>
#include "test_macros.h"
#if TEST_STD_VER < 14
# ifdef __cpp_lib_concepts
# 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++20"
# endif
#elif TEST_STD_VER == 17
# ifdef __cpp_lib_concepts
# error "__cpp_lib_concepts should not be defined before c++20"
# endif
#elif TEST_STD_VER == 20
# ifndef __cpp_lib_concepts
# error "__cpp_lib_concepts should be defined in c++20"
# endif
# if __cpp_lib_concepts != 202002L
# error "__cpp_lib_concepts should have the value 202002L in c++20"
# endif
#elif TEST_STD_VER == 23
# ifndef __cpp_lib_concepts
# error "__cpp_lib_concepts should be defined in c++23"
# endif
# if __cpp_lib_concepts != 202002L
# error "__cpp_lib_concepts should have the value 202002L in c++23"
# endif
#elif TEST_STD_VER > 23
# ifndef __cpp_lib_concepts
# error "__cpp_lib_concepts should be defined in c++26"
# endif
# if __cpp_lib_concepts != 202002L
# error "__cpp_lib_concepts should have the value 202002L in c++26"
# endif
#endif