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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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// { dg-do compile { target c++2a } }
// { dg-additional-options "-fconcepts-ts" }

template<typename X, typename Y = X>
concept bool HasBinaryAdd = requires(X x, Y y)
{
  {x + y} -> decltype(x + y);
};

void proc(HasBinaryAdd x, HasBinaryAdd y);