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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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// PR c++/67007
// { dg-options "-std=c++17 -fconcepts" }

template <class U>
concept bool A =
  requires (U u) { u; };

template <class T>
concept bool B =
  requires (T t) { { t } -> A; };

void foo(B);