anchor.diff:      case needs_compile(Source, Target, []) of
           true ->
               case Mod:file(Source, Opts) of
  -                {ok, _, []} ->
  +                {ok, _} ->
                       ok;
  -                {ok, _, _Warnings} ->
  -                    %% TODO: remove once R14B04 is released
  -                    case lists:member(fail_on_warning, Opts) of
  -                        true ->
  -                            ?FAIL;
  -                        false ->
  -                            ok
  -                    end;
                   _X ->
                       ?FAIL
               end;
  
positive.code: -spec compile_xrl(Source::file:filename(), Target::file:filename(),
                    Config::rebar_config:config()) -> 'ok'.
  compile_xrl(Source, Target, Config) ->
      Opts = [{scannerfile, Target}, {return, true}
              | rebar_config:get(Config, xrl_opts, [])],
      compile_xrl_yrl(Source, Target, Opts, leex).
  
  -spec compile_yrl(Source::file:filename(), Target::file:filename(),
                    Config::rebar_config:config()) -> 'ok'.
  compile_yrl(Source, Target, Config) ->
      Opts = [{parserfile, Target}, {return, true}
              | rebar_config:get(Config, yrl_opts, [])],
      compile_xrl_yrl(Source, Target, Opts, yecc).
  
  -spec compile_xrl_yrl(Source::file:filename(), Target::file:filename(),
  
negative.code: 
  -spec compile(Config::rebar_config:config(), AppFile::file:filename()) -> 'ok'.
  compile(Config, _AppFile) ->
      rebar_base_compiler:run(Config,
                              check_files(rebar_config:get_local(
                                            Config, xrl_first_files, [])),
  