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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does this also mean you can't do Rc<dyn Trait> like you can with Box
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You can do `Rc<dyn Trait>`. To be able to wrap a trait object, the struct needs to be defined as `struct Something<T: ?Sized>`, which means that `T` can only be stored behind a pointer. Anything that acts like a pointer will be defined that way
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ah right I'd made a guess at what ?Sized means but I've not met it in the book yet
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