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// { 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>"
#elif __cplusplus > 202002L && __cpp_lib_optional != 202110L
# error "Feature test macro for optional has wrong value for C++23 in <version>"
#endif
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