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Dino Distefano 24728dc093 New ObjC checker for calls to @optional methods ... Summary: It is unsafe to call protocol methods defined optional. Before calling them we should check it the implementation exists by calling `if ([object respondsToSelector:selector(...)]) ...` Without the above check we get run time crashes. Reviewed By: jvillard Differential Revision: D15554951 fbshipit-source-id: f0560971b		6 years ago
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linters.al	New ObjC checker for calls to @optional methods	6 years ago