[Bug libstdc++/122396] Hard error with optional iterator

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122396

--- Comment #3 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
Even with the proposed resolution, o.begin() will be hard error, as there will
be no viable candidate.