[Bug c++/92523] Unhelpful error messages when requires-clause contains function call

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92523

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Right, the code is invalid. This is just a diagnostic QoI bug, not
rejects-valid.