[Bug libstdc++/91170] [9/10 Regression] Crash in pdns resolver

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91170

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That mostly just adds static_assert checks, which can't change anything at
runtime.