90 lines · cpp
1// RUN: %clang_cc1 -std=c++2a -x c++ -verify %s2 3namespace nodiag {4 5template <typename T> requires (bool(T()))6struct A;7template <typename U> requires (bool(U()))8struct A;9 10template<typename T>11concept C1 = true;12 13template <C1 T> requires (bool(T()))14struct B;15template <C1 U> requires (bool(U()))16struct B;17 18} // end namespace nodiag19 20namespace diag {21 22template <typename T> requires true // expected-note{{previous template declaration is here}}23struct A;24template <typename T> struct A; // expected-error{{requires clause differs in template redeclaration}}25 26template <typename T> struct B; // expected-note{{previous template declaration is here}}27template <typename T> requires true // expected-error{{requires clause differs in template redeclaration}}28struct B;29 30template <typename T> requires true // expected-note{{previous template declaration is here}}31struct C;32template <typename T> requires (!0) // expected-error{{requires clause differs in template redeclaration}}33struct C;34 35template<typename T>36concept C1 = true;37 38template <C1 T> // expected-note{{previous template declaration is here}}39struct D;40template <typename T> requires C1<T> // expected-error{{type constraint differs in template redeclaration}}41struct D;42 43} // end namespace diag44 45namespace nodiag {46 47struct AA {48 template <typename T> requires (someFunc(T()))49 struct A;50};51 52template <typename U> requires (someFunc(U()))53struct AA::A { };54 55struct AAF {56 template <typename T> requires (someFunc(T()))57 friend struct AA::A;58};59 60} // end namespace nodiag61 62namespace diag {63 64template <unsigned N>65struct 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 75template <unsigned N>76template <template <unsigned> class TT> struct TA<N>::A { }; // expected-error{{requires clause differs in template redeclaration}}77 78 79template <unsigned N>80template <template <unsigned> class TT> requires TT<N + 1>::happy struct TA<N>::B { }; // expected-error{{requires clause differs in template redeclaration}}81 82template <unsigned N>83struct 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>::happy86 friend struct TA::A;87};88 89} // end namespace diag90