anchor.diff:       {zip, [parallel], [zip_unzip, zip_unzip3, zipwith, zipwith3]},
        {misc, [parallel], [reverse, member, dropwhile, takewhile,
   			 filter_partition, prefix, suffix, subtract,
  -			 hof, split]}
  +			 hof, split, concat]}
       ].
   
   init_per_suite(Config) ->
  
positive.code: 	 filter_partition/1, 
  	 otp_5939/1, otp_6023/1, otp_6606/1, otp_7230/1,
  	 prefix/1, suffix/1, subtract/1, droplast/1, hof/1,
  	 split/1]).
  
  %% Sort randomized lists until stopped.
  %%
  
negative.code:     LenB = length(B),
      LenB = Len - N,
      do_split_1(N+1, Len, List).
  
  %% Test lists:concat/1 mainly for coverage.
  concat(Config) when is_list(Config) ->
      S = integer_to_list(42) ++ "pi: " ++ float_to_list(math:pi()),
      S = lists:concat([42,pi,": ",math:pi()]),
      ok.
  