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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113620] ICE with missing "typename" and -std=c++20
Date: Fri, 26 Jan 2024 16:58:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113620

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|ice-on-invalid-code         |ice-on-valid-code
      Known to fail|                            |5.1.0

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #1)
> With -std=3Dc++17 it's fine:
>=20
> t1.c:19:5: error: need 'typename' before 'DEF::TYP' because 'DEF' is a
> dependent scope
>    19 |     DEF::TYP r=3DDEF::INIT;
>       |     ^~~
>       |     typename

Note once you add the typename (which is optional in C++20 by the way), the=
 ICE
is back in C++11 mode even.

This has been ICEing from at least GCC 5.1.0.=