anchor.diff:  
   wait() ->
       receive
  -		#sched{msg = continue} -> ok
  -    end.
  +	#sched{msg = continue} -> ok
  +    end.
  
positive.code:     Self = self(),
      spawn_link(fun() -> interleave_aux(Target, Options, Self) end),
      receive
  		{interleave_result, Result} -> Result
      end.
  
  interleave_aux(Target, Options, Parent) ->
  
negative.code: 
  %% Special internal message format (fields same as above).
  -record(special, {msg :: atom(),
  		  lid :: lid:lid() | 'not_found',
  		  misc = empty :: term()}).
  
  %%%----------------------------------------------------------------------
  %%% Types
  