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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99599] [11/12/13 Regression] Concepts requirement falsely
 reporting cyclic dependency, breaks tag_invoke pattern
Date: Fri, 22 Mar 2024 14:08:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99599

--- Comment #23 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #22)
> Here we go, this still fails on trunk, just by making the data member
> private:
That's because for a non-dependent conversion to a class type we only check=
 it
before constraints if it's an aggregate class (otherwise it might have a
constructor template, which means the conversion might instantiate things
making it unsafe to check before constraints).  Maybe we should consider
refining the heuristic further.  I believe the code is strictly speaking
invalid though.=