39 lines · cpp
1// RUN: %clang_cc1 -std=c++2a -x c++ %s -verify2 3template<typename T, int a>4concept C1 = true;5 6template<C1 T>7// expected-error@-1 {{'C1' requires more than 1 template argument; provide the remaining arguments explicitly to use it here}}8using badA = T[10];9 10template<C1<0> T>11using A = T[10];12 13using a = A<int>;14 15namespace ns {16 template<typename T, typename U, typename... X>17 concept C2 = true;18}19 20template<ns::C2 T1, ::ns::C2 T2>21// expected-error@-1 2{{'C2' requires more than 1 template argument; provide the remaining arguments explicitly to use it here}}22requires (sizeof(T1) <= sizeof(T2))23struct badB { };24 25template<ns::C2<int> T1, ::ns::C2<char, T1> T2>26 requires (sizeof(T1) <= sizeof(T2))27struct B { };28 29using b = B<int, int>;30 31template<ns::C2... T1>32// expected-error@-1 {{'C2' requires more than 1 template argument; provide the remaining arguments explicitly to use it here}}33struct badC { };34 35template<ns::C2<int>... T1>36struct C { };37 38using c1 = C<char, char, char>;39using c2 = C<char, char, char, char>;