[Bug tree-optimization/115979] Implicitly generated C++ calls stop musttail search early

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115979

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'd say the frontend should diagnose [[gnu::musttail]] in such a case because
it can use appropriate C++ wording?