[Bug libstdc++/64813] 23_containers/unordered_map/requirements/explicit_instantiation/[2,4].cc iCEs

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64813

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's not a libstdc++ bug if it's an ICE.