| // RUN: %clang_cc1 -fsyntax-only %s --std=c++17 -verify | |
| // This is a reduction of GH57370 and GH58028, originally appearing | |
| // in libstdc++'s variant code. | |
| struct V1 {}; | |
| struct V2 : V1 { | |
| int &a; | |
| }; | |
| template <class T> using void_t = void; | |
| template <class T> struct X { T x; }; | |
| template <class T1, class T2, class = void> struct Variant { | |
| Variant() = delete; // expected-note {{deleted here}} | |
| }; | |
| template <class T1, class T2> | |
| struct Variant<T1, T2, void_t<decltype(X<T2>{T1()})>> {}; | |
| void f() { | |
| Variant<V1, V1>(); | |
| Variant<V1, V2>(); // expected-error {{call to deleted constructor}} | |
| } |