kntk

@swift-main

struct Hoge { @discardableResult static func doSomething(handler block: @isolated(any) @escaping () -> Void) -> Any? { print(block.isolation) return nil } } actor SomeService { func subscribe1() { Hoge.doSomething { [weak self] in guard let self = self else { return } } } } let someService = SomeService() await someService.subscribe1()

(edited)

nil

<stdin>:4:15: warning: expression implicitly coerced from '(any Actor)?' to 'Any' 2 | @discardableResult 3 | static func doSomething(handler block: @isolated(any) @escaping () -> Void) -> Any? { 4 | print(block.isolation) | |- warning: expression implicitly coerced from '(any Actor)?' to 'Any' | |- note: provide a default value to avoid this warning | |- note: force-unwrap the value to avoid this warning | `- note: explicitly cast to 'Any' with 'as Any' to silence this warning 5 | return nil 6 | }