[Bug libstdc++/91997] pretty printers: The __node_type type alias in _Hashtable is not available

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91997

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Rafael, I'm unable to reproduce this with unordered containers. Do you have a
testcase?