c++lib <iterator> header missing required items.

[edfvogel]

The following C++20 program will compile with other compilers, but not when -stdlib=libc++ is specified:

#include <iterator>
decltype(std::ranges::rbegin) x;

The C++ standard states:

24.3 Range access [range.access]
1 In addition to being available via inclusion of the <ranges> header, the customization point objects in 24.3
are available when <iterator> (23.2) is included.

Not a big deal, but I wanted to report this.

Ed Vogel

[frederick-vs-ja]

Confirmed that ranges::rbegin, ranges::rend, ranges::crbegin, and ranges::crend are now missing. Godbolt link.

The related internal headers are not properly included from <iterator>, and other stuffs are obtained by transitive inclusion currently.