[Bug libstdc++/110917] std::format_to(int*, ...) fails to compile because of _S_make_span

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110917

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It fails for non-contrived cases like this too:

char8_t buf[32];
std::format_to(buf, "");