[Bug libstdc++/78830] std::prev accepts ForwardIterator-s

[akrzemi1 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78830

--- Comment #16 from Andrzej Krzemienski <akrzemi1 at gmail dot com> ---
Oh, I see. The above requirement applies only to chapter Algorithms library.
Not Iterators library. Sorry.