[PATCH] D33538: [coroutines] Support "coroutines" feature in module map requires clause

[Eric Fiselier via Phabricator via cfe-commits]

EricWF added a comment.

Even after fixing the libc++ guards, the header still emits a #warning when it's processed when coroutines are unavailable.

It seems like a useful feature test to have available. I'll commit shortly.


https://reviews.llvm.org/D33538