https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119415
--- Comment #5 from 康桓瑋 <hewillk at gmail dot com> --- (In reply to Tomasz Kamiński from comment #4) > If want to support user-defined containers, I think we should check if > iterator_traits<It>::iterator category exists, before calling > insert(Iterator, Iterator) overload. > > This will prevent hard-errors from older code, that do not handle C++20 > iterators. In case where they are supported, users can add insert_range > overload. which is also https://eel.is/c++draft/ranges#range.utility.conv.to-2.1.3.2.
