gcc/testsuite/g++.dg/concepts/fn-concept2.C


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// { dg-options "-std=c++1z -fconcepts" }

template<typename T>
  concept auto C1() { return 0; } // { dg-error "deduced return type" }

template<typename T>
  concept int C2() { return 0; } // { dg-error "return type" }