[PATCH] D26596: [RFC] Add _LIBCPP_NO_DISCARD and apply it to `Container::empty()`, `unique_ptr::release()`, and `Lockable::try_lock()`

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists requested changes to this revision.
mclow.lists added a comment.
This revision now requires changes to proceed.

Since we've implemented P0600, I believe that this patch is out of date.
The correct macro is `_LIBCPP_NODISCARD_AFTER_CXX17`, and I think that several 
of these cases are now handled.


https://reviews.llvm.org/D26596



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