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The
Node
trait currently is the only way to interact with any element in the tree in a type-safe manner viaBox<dyn Node>
. This PR adds new behaviors to theNode
trait and its implementation generators that allow it to:dyn Node
is, though not via the Rust type system.dyn Node
immutably or mutably.While it would be possible to do this cleanly, I suspect it'd be difficult to do without breaking things.