// { dg-do compile { target c++17 } } | |
#include <version> | |
#ifndef __cpp_lib_optional | |
# error "Feature test macro for optional is missing in <version>" | |
#elif __cpp_lib_optional < 201606L | |
# error "Feature test macro for optional has wrong value in <version>" | |
#elif __cplusplus >= 202002L && __cpp_lib_optional < 202106L | |
# error "Feature test macro for optional has wrong value for C++20 in <version>" | |
#endif |