[Bug libstdc++/106676] [C++20] Automatic iterator_category detection misbehaves when `::reference` is an rvalue reference, refuses to accept a forward iterator

[avi at scylladb dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106676

Avi Kivity <avi at scylladb dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |avi at scylladb dot com

--- Comment #5 from Avi Kivity <avi at scylladb dot com> ---
I believe this is causing application of std::views::transform() not to model
the underlying view's category, since its iterators can't return an lvalue.