| // Verify we diagnose an unstable satisfaction result that depends on |
| // return type deduction of the member function A::foo() below. |
| // |
| // { dg-do compile { target c++20 } } |
| |
| template <class T> concept fooable = requires (T t) { t.foo(); }; |
| // { dg-error "'false' to 'true'" "" { target *-*-* } .-1 } |
| |
| template <fooable T> int f () { return 0; } |
| template <class T> char f() { return 0; } |
| |
| struct A { auto foo(); }; |
| static_assert (sizeof (f<A>()) == 1); // { dg-message "first evaluated to 'false' from here" } |
| auto A::foo() { } |
| static_assert (sizeof (f<A>()) > 1); // { dg-error "assert" } |
| static_assert (sizeof (f<A>()) > 1); |
