[libcxx-commits] [libcxx] [libc++] P2770R0: "Stashing stashing iterators for proper flattening" (PR #66033)

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

The __as_lvalue function makes me super nervous, and I would like to have those concerns addressed before moving forward.

https://github.com/llvm/llvm-project/pull/66033