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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/97991] [9/10/11/12 Regression] ICE in c_parser_consume_token, 
 at c/c-parser.c:850
Date: Mon, 20 Sep 2021 22:15:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97991

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D47254
            Summary|ICE in                      |[9/10/11/12 Regression] ICE
                   |c_parser_consume_token, at  |in c_parser_consume_token,
                   |c/c-parser.c:850            |at c/c-parser.c:850
      Known to fail|                            |10.1.0, 4.4.7
   Target Milestone|---                         |9.5
      Known to work|                            |4.1.2

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to G. Steinmetz from comment #1)
> A special case, loosely related :
>=20
>=20
> $ cat z2.c
> #define foo _Pragma (" ")
> #pragma redefine_extname foo

That is PR 47254.=