@propertyWrapper value in actor-isolated property 'home' can not be mutated from a non-isolated context

[m1entus]

Describe the bug Compiler shows warnings about can not be mutated from a non-isolated context in Xcode 14.0 when assigning value when using custom @propertyWrapper .

Steps To Reproduce

public struct Home {
}

@propertyWrapper
public final class MyPropertyWrapper<Value: Sendable>: @unchecked Sendable {
    public var wrappedValue: Value

    public init(wrappedValue: Value) {
        self.wrappedValue = wrappedValue
    }
}

public actor MyActor {

    @MyPropertyWrapper
    private var home: Home

    public init(home: Home) {
        self.home = home // Actor-isolated property 'home' can not be mutated from a non-isolated context; this is an error in Swift 6
    }
}

as a workaround it is possible to use MyPropertyWrapper<Home> and then warning dissapears.

public actor MyActor {

    private var home: MyPropertyWrapper<Home>

    public init(home: Home) {
        self.home = MyPropertyWrapper<Home>(wrappedValue: home)
    }
}

Expected behavior There should not be warning about Actor-isolated property 'home' can not be mutated from a non-isolated context when using @MyPropertyWrapper Warning not appear in Xcode 13.4.0.

Screenshots

Environment (please fill out the following information)

• Xcode Version/Tag/Branch: Xcode 14.0.0 beta 6

Additional context Add any other context about the problem here.

[theblixguy]

Reduced:

public struct Home {}

public actor MyActor {

  private var home: Home {
    get { Home() }
    set { }
  }

  public init(home: Home) {
    self.home = home
  }
}

[m1entus]

Reduced:

public struct Home {}

public actor MyActor {

  private var home: Home {
    get { Home() }
    set { }
  }

  public init(home: Home) {
    self.home = home
  }
}

???

[theblixguy]

It’s a smaller version of the code that triggers the same warning. It’s nothing to do with property wrappers specifically, but with using a computed property.

[m1entus]

Aaa okay make sense now - thanks for explanation.

[m1entus]

Found out that this workaround works for me (instead of using computed property i use reference to propertyWrapper):

public actor MyActor {

    @MyPropertyWrapper
    private var home: Home

    public init(home: Home) {
        _home = MyPropertyWrapper<Home>(wrappedValue: home)
    }
}

[MilezHigh]

You need to make sure home is a published property

@Published var home: Home? = nil