[Bug libstdc++/109891] Null pointer special handling in ostream's operator << for C-strings

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109891

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Adding more UB to the library doesn't seem wise.

We could make it abort in debug mode, instead of setting badbit, but I don't
think we should just make it UB.