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update gcc11
author anatofuz
date Mon, 25 May 2020 07:50:57 +0900
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// PR c++/94907
// { dg-do compile { target c++20 } }

namespace std { struct strong_ordering { }; }

struct E;
struct D {
  virtual std::strong_ordering operator<=>(const struct E&) const = 0;
};
struct E : D {
  std::strong_ordering operator<=>(const E&) const override = default;
};