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Adds a replace_X method for every AST node type on VisitorMut (e.g. replace_local_assignment, replace_expression). Returning Some(replacement) substitutes the node and skips it entirely — visit_X, visit_X_end, and recursion into both the original node and the replacement's own children are all skipped. Returning None (the default) falls through to the normal visit_X / recurse / visit_X_end flow.
This is something I wanted for a project I was working on. I fully understand if this isn't something you want upstream, but also happy to adjust the design/implementation if it is something you'd be interested in.