| // { dg-do compile { target c++2a } } | |
| template<typename T> | |
| concept C = requires (T t) { t + 0; }; | |
| // { dg-message "satisfaction of .C<T>. .with T = typename T::type." "" { target *-*-* } .-1 } | |
| template<typename T> | |
| concept D = C<T>; | |
| // { dg-message "satisfaction of .D<typename T::type>. .with T = int." "" { target *-*-* } .-1 } | |
| template<typename T> | |
| concept E = D<typename T::type>; | |
| static_assert(E<int>); // { dg-error "static assertion failed|not a class" } |