anchor.diff:      ?line L2 = lists:sort(L2),
       ok.
   
  +%% Test lists:prefix/2.
  +prefix(Config) when is_list(Config) ->
  +    true = lists:prefix([], []),
  +    true = lists:prefix([], lists:seq(1, 10)),
  +    true = lists:prefix([a], [a,b]),
  +    true = lists:prefix(lists:seq(1, 10), lists:seq(1, 100)),
  +
  +    false = lists:prefix([a], []),
  +    false = lists:prefix([a], [b]),
  +    false = lists:prefix([a], [b,a]),
  +
  +    ok.
  +
   %% Test lists:suffix/2.
   suffix(Config) when is_list(Config) ->
       ?line true = lists:suffix([], []),
  
positive.code: 	 zip_unzip/1, zip_unzip3/1, zipwith/1, zipwith3/1,
  	 filter_partition/1, 
  	 otp_5939/1, otp_6023/1, otp_6606/1, otp_7230/1,
  	 suffix/1, subtract/1, droplast/1, hof/1]).
  
  %% Sort randomized lists until stopped.
  %%
  
negative.code:      {tickets, [parallel], [otp_5939, otp_6023, otp_6606, otp_7230]},
       {zip, [parallel], [zip_unzip, zip_unzip3, zipwith, zipwith3]},
       {misc, [parallel], [reverse, member, dropwhile, takewhile,
  			 filter_partition, prefix, suffix, subtract,
  			 hof]}
      ].
  
  