anchor.diff:      }
     }
     
  -  void _setBackup () {
  +  void _setLastRunCondition () {
       _lastRun = new Map<_FileType, String>();
       _lastRun[_FileType.DART] = context.dartSource;
       _lastRun[_FileType.HTML] = context.htmlSource;
  
positive.code:  
    void _storePreviousResult() {
      var input = new CompileRequest()..source = context.dartSource;
      _setBackup();
      dartServices
          .compile(input)
          .timeout(longServiceCallTimeout)
  
negative.code:     }
  
      var input = new CompileRequest()..source = context.dartSource;
      _setLastRunCondition();
      _cachedCompile = null;
      dartServices
          .compile(input)
  