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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107085] __reference_constructs_from_temporary does not
 detect static up-cast
Date: Wed, 05 Oct 2022 16:07:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107085

--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Even more simplified:

struct X {
  virtual void f();
};
struct Z : X {};
constexpr X x =3D X(Z());

I guess we shouldn't try to force_elide X::X(X&&) here because X is a
potentially-overlapping subobject.=