[Bug libstdc++/119888] [15 Regression] std::projected is no longer a class for C++20/23

[brunopitrus at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119888

--- Comment #7 from Bruno Pitrus <brunopitrus at hotmail dot com> ---
This seems to work:

using ProjectedType =
std::indirectly_readable_traits<std::projected<std::ranges::iterator_t<Range>,
Proj> >::value_type;

Thanks!