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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++/67084
// { dg-do compile { target c++17 } }
// { dg-additional-options "-fconcepts" }

template <class T>
concept True = true;
template <class T>
concept False = false;

template <class T>
constexpr bool p = false;

template <class T>
constexpr bool p<T*> = false;

template <class T>
  requires True<T>
constexpr bool p<T*> = false;

template <class T>
  requires True<T> && (T() == 0)
constexpr bool p<T*> = true;

template <class T>
constexpr bool q = false;

template <class T>
constexpr bool q<T*> = true;

template <class T>
  requires False<T>
constexpr bool q<T*> = false;

template <class T>
  requires False<T> && (T() != 0)
constexpr bool q<T*> = false;

static_assert (p<int*>,"");