[Bug c++/113360] [13/14 Regression] Truncated constexpr error messages with -std=c++23/26

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113360

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Idea: use cp_function_chain->invalid_constexpr to not to attempt to
explain_invalid_constexpr_fn.