| // { dg-do compile { target c++17 } } | |
| #include <version> | |
| #ifndef __cpp_lib_optional | |
| # error "Feature test macro for optional is missing in <version>" | |
| #elif __cplusplus == 201703L && __cpp_lib_optional != 201606L | |
| # error "Feature test macro for optional has wrong value for C++17 in <version>" | |
| #elif __cplusplus >= 202002L && __cpp_lib_optional < 202106L | |
| # error "Feature test macro for optional has wrong value for C++20 in <version>" | |
| #endif |