this thing where methods can take `self: Box<Self>`: what other types can be used here as wrappers around the Self type? my guess would be anything that implements Deref<Target=Self> ?
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Oh sorry I should have read the whole thread. There's an unstable feature for this, `arbitrary_self_types` which lets you do `self: Rc<Self>`, etc.
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Didn't 1.33 stabilize a bunch of these
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