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A comment on Xcode 9.1 Improves Display of Fatal Errors. Parent comment

Re:Xcode 9.1 Improves Display of Fatal Errors by hawflakes on Friday October 06, 2017 @01:36PM (#15418626)
Obj-C got _Nonnull and _Nullable type annotations as hints to the compiler. Presumably those checks could get compiled in as well?

https://developer.apple.com/swift/blog/?id=25

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