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From: "rafael at espindo dot la" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94645] [10 Regression][concepts] incorrect concept
 evaluation with decltype, plus internal error since
 r10-7554-gf1ad7bac76b66257
Date: Tue, 21 Apr 2020 19:08:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94645

--- Comment #8 from Rafael Avila de Espindola <rafael at espindo dot la> ---
The internal compiler error reduces to

struct unordered_map {
    int cend() const noexcept;
};
template <typename a> concept HasMapInterface =3D requires(a t) { t.cend();=
 };
template <typename Mapper>
requires HasMapInterface<decltype(Mapper::map())> struct l {
    friend void foo(l opt) {
      ([]() {})();
  }
};
struct p {
  static unordered_map map();
};
void g(l<p> *y) { foo(*y); }=