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 24.4 Copying Deep Structures
 ============================
 
 The procedures for copying lists ( Lists) only produce a flat
 copy of the input list, and currently Guile does not even contain
 procedures for copying vectors.  `copy-tree' can be used for these
 application, as it does not only copy the spine of a list, but also
 copies any pairs in the cars of the input lists.
 
  -- Scheme Procedure: copy-tree obj
  -- C Function: scm_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.
 

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