| // Verify we diagnose an unstable satisfaction result that depends on |
| // completeness of the type A below. |
| // |
| // Like in the previous test, here satisfaction also initially fails, |
| // but this time due to failed substitution into the atom's parameter mapping. |
| // |
| // { dg-do compile { target c++20 } } |
| |
| template <class T> concept valid_type = requires { typename T; }; |
| // { dg-message "satisfaction of 'valid_type<typename T::type>' .with T = A." "" { target *-*-* } .-1 } |
| // { dg-error "satisfaction value of atomic constraint 'requires.T;. .with T = typename T::type.' changed from 'false' to 'true'" "" { target *-*-* } .-2 } |
| |
| template <class T> concept has_mem_type = valid_type<typename T::type>; |
| // { dg-message "satisfaction of 'has_mem_type<T>' .with T = A." "" { target *-*-* } .-1 } |
| |
| template <has_mem_type T> int f () { return 0; } |
| template <class T> char f() { return 0; } |
| |
| struct A; |
| static_assert (sizeof (f<A>()) == 1); // { dg-message "first evaluated to 'false' from here" } |
| struct A { typedef int type; }; |
| static_assert (sizeof (f<A>()) > 1); // { dg-error "assert" } |
| static_assert (sizeof (f<A>()) > 1); |
