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(guile.info)Copying

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Copying Deep Structures
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 - primitive: copy-tree obj
     Recursively copy the data tree that is bound to OBJ, and return a
     pointer to the new data structure.  `copy-tree' recurses down the
     contents of both pairs and vectors (since both cons cells and
     vector cells may point to arbitrary objects), and stops recursing
     when it hits any other object.