[Bug c++/118525] [14/15 Regression] ICE after error dealing consteval

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118525

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's also the old "issue" that we have ERROR_MARK but not ERROR_TYPE which
would make this a bit more robust.