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From: "zyn7109 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108884] [temp.friends]/9: Should constraint friends
 declared in class scope differ with definition out of scope?
Date: Wed, 22 Feb 2023 14:12:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108884

--- Comment #3 from Younan Zhang <zyn7109 at gmail dot com> ---
(In reply to Younan Zhang from comment #2)
> (In reply to Patrick Palka from comment #1)
> > #1 is neither a non-template friend declaration with a requires-clause =
nor a
> > friend function template with a constraint that depends on a template
> > parameter from an enclosing template, so it seems to me [temp.friend]/9
> > doesn't apply here?
>=20
> I'm a bit confused. Doesn't `friend auto factory(const C auto&...)` equal=
 to
> template where `Us` depends on parameter from outter C?
> ```cpp
> template <C... Us>
> friend auto factory(const C Us&...);`
> ```

typo: friend auto factory(const Us&...);=