anchor.diff:      {NewConfig, Plt}.
   
   plt_dir(Config, Opts) ->
  -    Location = proplists:get_value(plt_location, Opts, shared),
  +    Location = proplists:get_value(plt_location, Opts, local),
       plt_dir1(Config, Location).
   
   plt_dir1(_Config, Location) when is_list(Location) ->
  
positive.code:         true ->
              Location
      end;
  plt_dir1(_Config, shared) ->
      {ok, Home} = init:get_argument(home),
      filename:join([Home, ".rebar", "plt"]);
  plt_dir1(Config, local) ->
      BaseDir = rebar_utils:base_dir(Config),
      filename:join([BaseDir, ".rebar"]).
  
  check_plt_existence(Plt) ->
      case filelib:is_regular(Plt) of
  
negative.code:         Description,
          {dialyzer,
           [
            {plt_location, local},
            {plt_location, shared},
            {plt_location, "custom_dir"},
            {plt_extra_apps, [app1, app2]},
            {warnings, [unmatched_returns, error_handling]}
  