[libcxx-commits] [libcxx] [libc++] LWG3953 (PR #107535)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

No change requested. The modification is almost, if not exactly, NFC, given `input_iterator` has already required that `iter_rvalue_reference_t` is valid.

It would be extremely weird to me to test something (if exists) for which `iter_rvalue_reference_t` results in substitution failure while `input_iterator` gives hard error (caused by some stuff checked before `iter_rvalue_reference_t`).

https://github.com/llvm/llvm-project/pull/107535