[Bug libstdc++/68190] [5/6 Regression] iterator mix up with set::find and heterogenous lookup

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68190

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Howard's suggestion is approved if someone tests it, I only have my phone and
no machine I can build or test on.