[libcxx-commits] [libcxx] [libc++] Implement P2538R1 "ADL-proof std::projected" (PR #65411)

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https://github.com/EricWF approved this pull request.

LGTM but I would like to see the tests backported to all the dialects where projected is available.

https://github.com/llvm/llvm-project/pull/65411