anchor.diff:      ensure_started(compiler),
       ensure_started(syntax_tools),
       ensure_started(mochiweb),
  -    application:set_env(webmachine, webmachine_logger_module,
  -                       webmachine_logger),
  +    application:set_env(webmachine, webmachine_logger_module, webmachine_logger),
       ensure_started(webmachine),
       application:start(engine).
   
  
positive.code:     ensure_started(compiler),
      ensure_started(syntax_tools),
      ensure_started(mochiweb),
      application:set_env(webmachine, webmachine_logger_module,
                          webmachine_logger),
      ensure_started(webmachine),
      engine_sup:start_link().
  
  
negative.code: 
  ensure_started(App) ->
      case application:start(App) of
          ok -> ok;
          {error, {already_started, App}} -> ok
      end.
  
  %% @spec start_link() -> {ok,Pid::pid()}
  