[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 #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
vector(InputIterator, InputIterator) is now optimized for C++20 iterators that
don't meet the Cpp17ForwardIterator requirements, as of
r15-8904-ge200f53a555651