| // PR c++/78446 | |
| // { dg-do compile { target c++11 } } | |
| struct A { void operator()(); }; | |
| struct B { void operator()(); }; | |
| struct C : A, B {}; | |
| template<class T> | |
| decltype(T()()) foo(int); | |
| template<class> int foo(...); | |
| using type = decltype(foo<C>(0)); | |
| using type = int; |