[4.1] [SR-7182] Allow ownership keywords on properties in @objc protocols. #15275
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Explanation: SE-0186 removed support for ownership keywords (
weakandunowned) on properties in protocols. However, these keywords do have meaning for@objcprotocols, where they affect the@propertydeclaration that is created in the generated header. Allow these keywords (again) on properties of@objcprotocols.Scope: Affects projects that define
@objcprotocols withweakorunownedproperties, which were accepted in Swift < 4.1 and started getting warnings in Swift 4.2.Risk: Effectively none; we're re-enabling something we've had since Swift 1.0 and that was recently disabled.
Testing: Compiler regression tests, including new tests
Reviewer: @jrose-apple
SR / Radar: SR-7182 / rdar://problem/38418112.