[Bug c++/115900] [14/15 Regression] constexpr object modification during construction gives "Modifying a const object is not allowed in a constant expression"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115900

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #1)
> Started with r14-409:
> 
> commit 4b8d0d4d7fd245ef85c7801e7838845502a5a61d
> Author: Jason Merrill <ja...@redhat.com>
> Date:   Mon May 1 17:41:44 2023 -0400
> 
>     c++: std::variant slow to compile [PR109678]

Hmm, that was backported for GCC 13.3.0 but the test works there. Maybe it was
r14-410 which is related but not backported.