anchor.diff:  ?comp(beam_compiler_9).
   ?comp(beam_compiler_10).
   ?comp(beam_compiler_11).
  -?comp(beam_compiler_13).
   
   ?comp(otp_2330).
   ?comp(otp_2380).
  
positive.code: 
  compiler_src() ->
      filelib:wildcard(filename:join([code:lib_dir(compiler), "src", "*.erl"])).
  
  compiler_modules(Dir) ->
      Files = filelib:wildcard(filename:join(Dir, "*.beam")),
      [list_to_atom(filename:rootname(filename:basename(F))) || F <- Files].
  
  make_compiler_dir(Priv, Dir0) ->
      Dir = filename:join(Priv, Dir0),
  
negative.code: -define(comp(N),
  	N(Config) when is_list(Config) -> try_it(N, Config)).
  
  ?comp(compiler_1).
  
  ?comp(beam_compiler_4).
  ?comp(beam_compiler_6).
  