1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s 2 3 template<class> 4 concept fooable = true; 5 6 struct S { 7 template<class> friend concept x = requires { requires true; }; // expected-error {{friend declaration cannot be a concept}} 8 template<class> friend concept fooable; // expected-error {{friend declaration cannot be a concept}} 9 template<class> concept friend fooable; // expected-error {{expected unqualified-id}} 10 friend concept fooable; // expected-error {{friend declaration cannot be a concept}} 11 concept friend fooable; // expected-error {{friend declaration cannot be a concept}} 12 concept fooable; // expected-error {{concept declarations may only appear in global or namespace scope}} 13 }; 14