| // { dg-do compile { target c++17_only } } |
| // { dg-options "-fconcepts" } |
| |
| template<typename T> |
| concept bool C1 = __is_same_as(T, int); |
| |
| template<int N> |
| concept bool C2 = N == 0; |
| |
| template<template<typename> class X> |
| concept bool C3 = false; |
| |
| template<typename> struct Foo; |
| |
| template<C1... Ts> struct S1 { }; |
| template<C2... Ns> struct S2 { }; |
| template<C3... Xs> struct S3 { }; |
| |
| S1<int, int, bool> s1; // { dg-error "constraint failure|invalid type" } |
| S2<0, 1, 2> s2; // { dg-error "constraint failure|invalid type" } |
| S3<Foo> s3; // { dg-error "constraint failure|invalid type" } |
