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131
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1 // { dg-do compile { target c++17 } }
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2 // { dg-options "-fconcepts" }
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111
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3
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4 // Check shorthand notation.
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5
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6 template<typename T>
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7 concept bool Type() { return true; }
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8
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9 template<typename T, typename U>
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10 concept bool Same() { return __is_same_as(T, U); }
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11
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12 template<Same<int> T> struct S1 { };
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13 template<typename T, Same<T> U> struct S2 { };
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14
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15 void f(Same<int> q) { }
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16 void g(Type a, Same<decltype(a)> b) { }
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17
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18 int main() {
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19 S1<char> s1; // { dg-error "constraint|invalid" }
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20 S2<int, char> s2; // { dg-error "constraint|invalid" }
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21
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22 f('a'); // { dg-error "cannot" }
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23 g(0, 'a'); // { dg-error "cannot" }
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24 }
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