// RUN: %clang_cc1 -std=c++2a -x c++ -verify %s namespace nodiag { template <typename T> requires (bool(T())) struct A; template <typename U> requires (bool(U())) struct A; template<typename T> concept C1 = true; template <C1 T> requires (bool(T())) struct B; template <C1 U> requires (bool(U())) struct B; } // end namespace nodiag namespace diag { template <typename T> requires true // expected-note{{previous template declaration is here}} struct A; template <typename T> struct A; // expected-error{{requires clause differs in template redeclaration}} template <typename T> struct B; // expected-note{{previous template declaration is here}} template <typename T> requires true // expected-error{{requires clause differs in template redeclaration}} struct B; template <typename T> requires true // expected-note{{previous template declaration is here}} struct C; template <typename T> requires (!0) // expected-error{{requires clause differs in template redeclaration}} struct C; template<typename T> concept C1 = true; template <C1 T> // expected-note{{previous template declaration is here}} struct D; template <typename T> requires C1<T> // expected-error{{type constraint differs in template redeclaration}} struct D; } // end namespace diag namespace nodiag { struct AA { template <typename T> requires (someFunc(T())) struct A; }; template <typename U> requires (someFunc(U())) struct AA::A { }; struct AAF { template <typename T> requires (someFunc(T())) friend struct AA::A; }; } // end namespace nodiag namespace diag { template <unsigned N> struct TA { template <template <unsigned> class TT> requires TT<N>::happy // expected-note {{previous template declaration is here}} struct A; template <template <unsigned> class TT> requires TT<N>::happy // expected-note {{previous template declaration is here}} struct B; struct AF; }; template <unsigned N> template <template <unsigned> class TT> struct TA<N>::A { }; // expected-error{{requires clause differs in template redeclaration}} template <unsigned N> template <template <unsigned> class TT> requires TT<N + 1>::happy struct TA<N>::B { }; // expected-error{{requires clause differs in template redeclaration}} template <unsigned N> struct TA<N>::AF { // we do not expect a diagnostic here because the template parameter list is dependent. template <template <unsigned> class TT> requires TT<N + 0>::happy friend struct TA::A; }; } // end namespace diag