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[SR-15351] curious case of defer MainActor call in a Task #57673

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mattneub opened this issue Oct 18, 2021 · 0 comments · Fixed by #60688
Closed

[SR-15351] curious case of defer MainActor call in a Task #57673

mattneub opened this issue Oct 18, 2021 · 0 comments · Fixed by #60688
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@etcwilde
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself concurrency Feature: umbrella label for concurrency language features

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@mattneub
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Previous ID SR-15351
Radar rdar://80799233
Original Reporter @mattneub
Type Bug
Environment

Xcode 13

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee @etcwilde
Priority Medium

md5: 10c8f8913a8f1abbe13d1d31c412ddd3

Issue Description:

Consider:

    @MainActor func foo() {}
    override func viewDidLoad() {
        super.viewDidLoad()
        Task {
            do {
                self.foo() // ok
                defer {
                    self.foo() // compile error
                }
                print("dummy")
            }
        }
    }

The second call to `self.foo()` is a compile error, but the first is not. That seems incoherent, as they are both called from within exactly the same context. The `defer` shouldn't make a difference.
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@etcwilde etcwilde

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself concurrency Feature: umbrella label for concurrency language features
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[Concurrency] Handle actor isolation for defers in closures theblixguy/swift
2 participants
@mattneub @AnthonyLatsis