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// { dg-options "-std=c++17 -fconcepts" }
template<typename T>
concept auto C1() { return 0; } // { dg-error "16:concept .concept auto C1\\(\\). declared with a deduced return type" }
template<typename T>
concept int C2() { return 0; } // { dg-error "15:concept .concept int C2\\(\\). with non-.bool. return type .int." }
template<typename T>
concept bool C3(int) { return 0; } // { dg-error "16:concept .concept bool C3\\(int\\). declared with function parameters" }
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