[Bug libstdc++/100070] Standard library container iterator-pair constructors should check C++20 iterator concepts

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100070

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
If there is code that cares, we could always add std::__cpp17_iterator_category
for the cases where we really care about the traditional category (or where
we're forwarding the result of *i to user code which might care but we can't
tell).