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The probably most well thought out approach for handling complicated mutable trees (with parent-references) in Rust is Rowan with red/green nodes as popularized by the Roslyn project, though its particular implementation has a few rough edges (doesn't use the type system to denote whether a node is mutable or not). The core idea is to have "green nodes" that form an ordinary immutable tree to store actual data, and on-demand "red nodes" that serve as a kind of cursor and offer a richer view, for example tracking parent–child relationships as the tree is traversed.
