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From: "joeloser93 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101677] [11/12 Regression] Concept with use of incomplete
 type succeeds on GCC 10.3.0, fails on GCC 11 onward
Date: Fri, 30 Jul 2021 15:50:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101677

--- Comment #2 from Joe Loser <joeloser93 at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> >This bug can be worked around by using a complete type instead when defi=
ning the concept.=20
>=20
> It does not even have to be complete type; just defined before.
> So adding:
> class S;
> at the begining causes GCC to accept the code.

Yep, you're right. That's actually what I use in my codebase as a workaroun=
d. I
misspoke in the description -- sorry about that. Updated Godbolt link is at
https://godbolt.org/z/KGq48WYq4=