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// { dg-options "-std=c++17 -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 = true;
template<typename> struct Foo;
template<C1... Ts = int> struct S1; // { dg-error "default argument" }
template<C1... = int> struct S2; // { dg-error "default argument" }
template<C2... Ns = 0> struct S3; // { dg-error "default argument" }
template<C2... = 0> struct S4; // { dg-error "default argument" }
template<C3... Ts = Foo> struct S5; // { dg-error "default argument" }
template<C3... = Foo> struct S6; // { dg-error "default argument" }
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