File: no_3.erl

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erlang 1%3A19.2.1%2Bdfsg-2%2Bdeb9u3
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-module(no_3).
-compile(export_all).

?MODULE() ->
    ok.

f(X) ->
    Ref = case X of
	      false -> ref;
	      true -> make_ref()
	  end,
    receive
	Ref -> ok
    end.