[Bug c++/67762] [C++1z] 'not a constant expression" errors only with -fsanitize=undefined

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67762

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #36415|0                           |1
        is obsolete|                            |

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 36417
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36417&action=edit
Somewhat reduced testcase

C-Reduce 2.4.0 was released yesterday, which doesn't crash anymore.
Somewhat reduced testcase attached.