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145
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1 // { dg-do compile { target c++17_only } }
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131
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2 // { dg-options "-fconcepts" }
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111
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3
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4 template<typename T>
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5 concept bool C1 = __is_same_as(T, int);
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6
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7 template<int N>
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8 concept bool C2 = N == 0;
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9
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10 template<template<typename> class X>
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11 concept bool C3 = false;
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12
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13 template<typename> struct Foo;
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14
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15 // Instantiation of default arguments happens at the point of
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16 // instantiation for the class.
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17
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18 template<C1 T = char> struct S1 { };
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19 template<C2 N = 1> struct S2 { };
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20 template<C3 X = Foo> struct S3 { };
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21
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22 S1<> s1; // { dg-error "constraint failure|invalid type" }
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23 S2<> s2; // { dg-error "constraint failure|invalid type" }
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24 S3<> s3; // { dg-error "constraint failure|invalid type" }
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