[Bug libstdc++/100243] [10 Regression] invalid use of incomplete type 'std::__detail::__iter_traits<T, std::indirectly_readable_traits<T> >' {aka 'struct std::indirectly_readable_traits<T>'}

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100243

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It should be already fixed on the branch by
32a859531e854382c18abf0b14a306d83f793eb5