// { dg-do preprocess { target c++20 } } // { dg-require-effective-target hosted } // { dg-add-options no_pch } #include #ifndef __cpp_lib_interpolate # error "Feature-test macro for midpoint and lerp missing in " #elif __cpp_lib_interpolate != 201902L # error "Feature-test macro for midpoint and lerp has wrong value in " #endif