Description

The below code results in the following error on the "print(foo)" line:

Sending 'self' risks causing data races
Task-isolated 'self' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses

despite the issue being that "object" is being captured in the main actors closure, not the fact self is being referenced in this closure. Indeed, when I move the guard line out of the main actor, the code compiles fine.

Reproduction

import UIKit

public class SomeClass : UIView {
    let foo = 16092022
    
    public override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
            
        Task { @MainActor in
            guard let boo = object as? UIScrollView else {
                return
            }

            print(foo)
        }
    }
}

Expected behavior

The error should be clear about what the issue is which is that object is being captured in a main-actor isolated closure.

Environment

Apple Swift version 6.1 (swift-6.1-RELEASE)
Target: arm64-apple-macosx15.0

Additional information

No response