Doug Gregor cabdf84179 Suggest @objc for overrides of declarations from/in extensions. ...

The Swift class model does not support overriding declarations where either
the overridden declaration or the overriding declaration are in an extension.
However, the Objective-C class model does, so marking the declaration as
@objc (when possible) will work around the limitation.

Customize the "cannot override declaration in extension" diagnostic to
suggest adding @objc to the overridden declaration in cases where
@objc is permitted. Fixes SR-6512 / rdar://problem/35787914.

2017-12-13 14:54:32 -08:00

2.4 KiB

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