[libcxx-commits] [libcxx] [libc++][test] Move the SFINAE test for return types of `quoted` to `libcxx/test/libcxx/` (PR #157026)

[Louis Dionne via libcxx-commits]

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

LGTM. Seems like an improvement not to assume this is standard until the spec definitely says so.

https://github.com/llvm/llvm-project/pull/157026