[PATCH] D41048: [libcxx] workaround PR 28385 in __find_exactly_one_checked

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists added a comment.

Ah - that was the factor I was missing.
The tests pass for me with `-std=c++2a`, but fail for `std=c++17`

Casey's original post said they fail with `2a`, and I'm *still* not seeing that.


https://reviews.llvm.org/D41048