[PATCH] D28591: [libcxx] [test] Don't ask whether Incomplete& can be assigned to.

[Eric Fiselier via Phabricator via cfe-commits]

EricWF accepted this revision.
EricWF added a comment.
This revision is now accepted and ready to land.

LGTM.

Although `is_assignable` can often get accidentally instantiated with an incomplete type by way of `std::tuple<Incomplete&>` or similar, which is the rational for this test case.


https://reviews.llvm.org/D28591