Cannot access property with a non-sendable type from non-isolated deinit

[xwu (Xiaodi Wu)]

Deinit and MainActor

I've annotated some of my classes that should be run only on the UI thread with @MainActor. However, I'm running into a compiler error when I try to clean up resources in deinit. Here's a stripped-down example of the error, running in Xcode 13.0 beta 2 (13A5155e): [image] Is it possible to clean up resources in the deinit of a @MainActor-annotated class? I did notice that if I inline the cleanup, then it compiles, e.g.: deinit { self.inputStream?.close() self.outputStream?.close(…