gcc/testsuite/g++.dg/concepts/fn6.C


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

// Redefinition errors.

template<typename T>
  concept bool C() { return __is_class(T); }

template<typename T>
  concept bool D() { return C<T>() and __is_empty(T); }

template<C T> void f(T x) { }
template<typename T>
  requires C<T>()
    void f(T x) { } // { dg-error "redefinition" }

int main() { }