LiveData.Tracked.FlatAst.Pass.RewriteAst.ExpandDependencies (live_data v0.1.0-alpha0)
Second subpass of rewriting.
Given a set of initial nodes, will collect a set of all cumulative dependencies these involves.
This has the effect of doing dead code elimination, and duplicating any expressions that are used in both the return value position and regular value positions.
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child_exprs_without_traversed(expr)
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expand_dependencies(to_visit, data, ast)
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expand_dependencies_inner(list, original, visited, data, ast)
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