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This allows deref patterns to move out of boxes. Implementation-wise, I've opted to put the information of whether a deref pattern uses a built-in deref or a method call in the THIR. It'd be a bit less code to check `.is_box()` everywhere, but I think this way feels more robust (and we don't have a `mutability` field in the THIR that we ignore when the smart pointer's a box). I'm not sure about the naming (or using `ByRef`), though.