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[SR-942] Cannot provide default implementation of @objc protocol via extension #43554

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tjw opened this issue Mar 14, 2016 · 1 comment
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[SR-942] Cannot provide default implementation of @objc protocol via extension #43554

tjw opened this issue Mar 14, 2016 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@tjw
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tjw commented Mar 14, 2016

Previous ID SR-942
Radar None
Original Reporter @tjw
Type Bug
Status Resolved
Resolution Duplicate

Attachment: Download

Environment

Xcode 7.3b5 with swift-DEVELOPMENT-SNAPSHOT-2016-03-01-a

Additional Detail from JIRA
Votes 0
Component/s
Labels Bug
Assignee None
Priority Medium

md5: 7e5f065cdfa911edc13afa2e01139a07

duplicates:

  • SR-492 Protocol extenstion methods aren't exposed to Objective-C

Issue Description:

If you have an @objc protocol, provide a default implementation of methods in it via an extension, and then conform to that protocol in an @objc class, the compiler emits errors about the methods being not-@objc.

It seems like since the extension is on an @objc protocol, the methods defined in the extension should be @objc and the compiler should clone them into the conforming class when the conformance is declared (last line in the sample).

This seems possibly related to https://bugs.swift.org/browse/SR-492 but in my case the protocol and class involved are already marked as @objc.
@belkadan
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It is the same as SR-492, and there's unfortunately not much we can do about it.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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@tjw @belkadan