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[SR-15694] @MainActor doesn't cascade to init in class #57973

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keith opened this issue Jan 6, 2022 · 2 comments
Closed

[SR-15694] @MainActor doesn't cascade to init in class #57973

keith opened this issue Jan 6, 2022 · 2 comments
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@kavon
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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@keith
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keith commented Jan 6, 2022

Previous ID SR-15694
Radar rdar://problem/87217618
Original Reporter @keith
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s
Labels Bug
Assignee @kavon
Priority Medium

md5: df5f376c11c24d77b7e241a9c0d14f7a

Issue Description:

With this source:

import Foundation
import UIKit

@MainActor
class Foo: UIView {
    init() {
        super.init(frame: .zero)
    }

    required init?(coder: NSCoder) {
        fatalError()
    }
}

I would expect that everything in `Foo` was constrained to the `MainActor`, but this produces this error with the 2021-12-23 main snapshot (org.swift.50202112231a):

% TOOLCHAINS=org.swift.50202112231a xcrun swiftc /tmp/foo2.swift -sdk /Applications/Xcode-13.0.0-RC1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator15.0.sdk -target x86_64-apple-ios12.0-simulator
/tmp/foo2.swift:7:15: error: call to main actor-isolated initializer 'init(frame:)' in a synchronous nonisolated context
        super.init(frame: .zero)
              ^
UIKit.UIView:4:12: note: calls to initializer 'init(frame:)' from outside of its actor context are implicitly asynchronous
    public init(frame: CGRect)
           ^

Marking the `init` function with `MainActor` as well as the class fixes this
@kavon
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kavon commented Jan 6, 2022

@swift-ci create

@kavon
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kavon commented Mar 30, 2022

resolved in #41662

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@kavon kavon

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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