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// { 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;
// Instantiation of default arguments happens at the point of
// instantiation for the class.
template<C1 T = char> struct S1 { };
template<C2 N = 1> struct S2 { };
template<C3 X = Foo> struct S3 { };
S1<> s1; // { dg-error "constraint failure|invalid type" }
S2<> s2; // { dg-error "constraint failure|invalid type" }
S3<> s3; // { dg-error "constraint failure|invalid type" }
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