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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/15538] Misleading diagnostic for recursive template
 instantiation
Date: Thu, 05 Aug 2021 02:38:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D15538

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |7.0

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #8)
> No change in GCC 7.0.

> t.C: In instantiation of =E2=80=98struct A<H<bool> >=E2=80=99:
> t.C:5:8:   required from =E2=80=98struct H<bool>=E2=80=99
> t.C:7:9:   required from here
> t.C:2:26: error: invalid use of incomplete type =E2=80=98struct H<bool>=
=E2=80=99
>  struct A { typename D::Q r;};
>                           ^
> t.C:5:8: note: declaration of =E2=80=98struct H<bool>=E2=80=99
>  struct H : A<H<G> > { typedef G* Q; };
>         ^

No that is what we want.  Before it was "no type named 'Q' in 'struct
H<bool>'".=