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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++/85706
// { dg-do compile { target c++17 } }
// { dg-additional-options "-fconcepts" }

template<class T> struct S {
  S(T);
};

template<class = void>
auto f() -> decltype(S(42)); // error