1 // RUN: %clang_cc1 -std=c++2a -x c++ -verify %s 2 3 namespace nodiag { 4 5 template <typename T> requires (bool(T())) 6 struct A; 7 template <typename U> requires (bool(U())) 8 struct A; 9 10 template<typename T> 11 concept C1 = true; 12 13 template <C1 T> requires (bool(T())) 14 struct B; 15 template <C1 U> requires (bool(U())) 16 struct B; 17 18 } // end namespace nodiag 19 20 namespace diag { 21 22 template <typename T> requires true // expected-note{{previous template declaration is here}} 23 struct A; 24 template <typename T> struct A; // expected-error{{requires clause differs in template redeclaration}} 25 26 template <typename T> struct B; // expected-note{{previous template declaration is here}} 27 template <typename T> requires true // expected-error{{requires clause differs in template redeclaration}} 28 struct B; 29 30 template <typename T> requires true // expected-note{{previous template declaration is here}} 31 struct C; 32 template <typename T> requires (!0) // expected-error{{requires clause differs in template redeclaration}} 33 struct C; 34 35 template<typename T> 36 concept C1 = true; 37 38 template <C1 T> // expected-note{{previous template declaration is here}} 39 struct D; 40 template <typename T> requires C1<T> // expected-error{{type constraint differs in template redeclaration}} 41 struct D; 42 43 } // end namespace diag 44 45 namespace nodiag { 46 47 struct AA { 48 template <typename T> requires (someFunc(T())) 49 struct A; 50 }; 51 52 template <typename U> requires (someFunc(U())) 53 struct AA::A { }; 54 55 struct AAF { 56 template <typename T> requires (someFunc(T())) 57 friend struct AA::A; 58 }; 59 60 } // end namespace nodiag 61 62 namespace diag { 63 64 template <unsigned N> 65 struct TA { 66 template <template <unsigned> class TT> requires TT<N>::happy // expected-note {{previous template declaration is here}} 67 struct A; 68 69 template <template <unsigned> class TT> requires TT<N>::happy // expected-note {{previous template declaration is here}} 70 struct B; 71 72 struct AF; 73 }; 74 75 template <unsigned N> 76 template <template <unsigned> class TT> struct TA<N>::A { }; // expected-error{{requires clause differs in template redeclaration}} 77 78 79 template <unsigned N> 80 template <template <unsigned> class TT> requires TT<N + 1>::happy struct TA<N>::B { }; // expected-error{{requires clause differs in template redeclaration}} 81 82 template <unsigned N> 83 struct TA<N>::AF { 84 // we do not expect a diagnostic here because the template parameter list is dependent. 85 template <template <unsigned> class TT> requires TT<N + 0>::happy 86 friend struct TA::A; 87 }; 88 89 } // end namespace diag 90