I have a tree of widgets that I'm currently managing with Rc. I wanted to experiment with SlotMap and put some things connected to these objects in a central owner/context (struct Window), but then I wonder how to cleanup. With plain Rc, when the last ref is dropped, the memory gets cleaned up. But what if my Window has a field like:

struct Window {
    ...
    things: SlotMap<WidgetId, Stuff>

}

I'd need to somehow get an &mut Window in the drop method for my widgets, so I could remove the entry in the SlotMap.

Is there a pattern for handling this?

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