pattern matching - how to to do the "noop but return unit" in OCaml -

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I want to print a list of stars after matching a pattern to join this powerful function

How can I show "nothing but the return unit" operation?

What do I mean: 

  print_node node = with match nodes [] - & gt; (* * I want to do noop * here). S :: t - & gt; Print_string; You can only write  () .

/ P>

Look in the manual: () how do you create the unit value.


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