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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/104025] [12 Regression] '-fcompare-debug' failure with
 enabled warnings since r12-6563-gb8ffa71e4271ae56
Date: Mon, 17 Jan 2022 22:40:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104025

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> Created attachment 52213 [details]
> gcc12-pr104025.patch
>=20
> Untested fix.  I think the old input_location is the right one.

I think the bug is that cp_lexer_rollback_tokens isn't properly updating
input_location.=