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[lambda.git] / exercises / assignment5_hint3.mdwn

Consider this pattern:

    # let rec enumerate_from (t:'a color_tree) counter = match t with
      | Leaf x -> (Leaf counter, counter+1)
      | Branch (left,col,right) -> let (left',counter') = ... in
                                   let (right',counter'') = ... in
                                   ...
      ;;