Matt Wright 1ff4ca0d41 dispatch_source_create returns NULL but is marked up as nonnull ...

dispatch_source_create is marked up as non-null but can actually return
null in programming error issues. In order to maintain the nullabilty
contract, these issues will now cause the overlay to assert and crash
rather than return a null pointer out of a non-null call.

Resolves: <rdar://problem/39937177>

2018-07-13 10:47:09 -07:00

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