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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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// PR c++/66758
// { dg-do compile { target c++2a } }

template <class T, class U>
concept C = requires (T t, U u) { t + u; };

template <class T, class U>
  requires C<T,U>
void f(T t, U u) { t + u; }

struct non_addable { };

int main()
{
  using T = decltype(f(42, 24));
}