[libcxx-commits] [libcxx] [libcxx] P2278R4: implement `{basic_, }const_iterator`, and have `cbegin` et. al. return it (PR #99915)

[Mark de Wever via libcxx-commits]

mordante wrote:

@strega-nil Can you update the test `test/std/containers/views/views.span/span.iterators/iterator.pass.cpp`. I recently added it with some ifdefs since we didn't have this paper implemented. The `ifdef` should be adjusted to the proper language version; depending whether or not this is a DR.

https://github.com/llvm/llvm-project/pull/99915