Getting `Main actor-isolated initializer 'init()' has different actor isolation from nonisolated overridden declaration` issue

[serenatesting]

Summary

I’m seeing the compiler error:

Main actor-isolated initializer 'init()' has different actor isolation from nonisolated overridden declaration

when subclassing NeedleFoundation.Component. happens on a clean build project.

Steps to reproduce

• Needle version: v0.25.1 (SPM)
• Xcode: 26
• Swift: 5
• Platform: iOS

import NeedleFoundation
import UIKit

[jcrookebumble]

This is caused by the fact that approachable concurrency is the default for new Xcode 26 projects. @serenatesting you can simply turn this off to work around the problem. However, in the case here we would like to use approachable concurrency. Right now I'm trying to override the NeedleFoundation module to MainActor isolation, but then I get:

nonisolated deinitializer 'deinit' has different actor isolation from main actor-isolated overridden declaration

For PluginizedComponent.deinit

Edit: it is in fact a possible solution to just mark the subclass as nonisolated, although we're not quite sure of the implications of this yet. It does however compile @serenatesting