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  1. type i_or_f = Int of int | Float of float;;
  2. let conv x = match x with Int i -> float_of_int i | Float f -> f;;
  3.  
  4. utop # conv (Int 4);;
  5. - : float = 4.
  6. utop # conv (Float 4.);;
  7. - : float = 4.
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