[Bug c++/104025] [12 Regression] '-fcompare-debug' failure with enabled warnings since r12-6563-gb8ffa71e4271ae56

[jason at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104025

--- 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
> 
> 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.