1 // { dg-options "-std=c++17 -fconcepts" }
3 template<typename T1, typename T2>
4 concept bool C1 = true;
6 template<typename T1, typename T2, typename T3>
7 concept bool C2 = true;
10 template<C1 T> // { dg-error "not a type" }
11 constexpr bool f1( ) { return true; }
13 template<C2<int> T> // { dg-error "expected|not a type" }
14 constexpr bool f2( ) { return true; }