[libcxx-commits] [libcxx] [libc++] Add `ranges::fold_left_first` and `ranges::fold_left_first_with_iter` (PR #121558)

[Mark de Wever via libcxx-commits]

https://github.com/mordante requested changes to this pull request.

This looks good after addressing my last review comment.
Please apply that comment to all tests in this patch.

I like to have a quick look at the final tests.


https://github.com/llvm/llvm-project/pull/121558