anchor.diff:    Scope _currentScope;
   
     /**
  -   * true or false depending on if stopPropagation() was executed.
  +   * true or false depending on if [stopPropagation] was executed.
      */
     bool get propagationStopped => _propagationStopped;
     bool _propagationStopped = false;
   
     /**
  -   * true or false depending on if preventDefault() was executed.
  +   * true or false depending on if [preventDefault] was executed.
      */
     bool get defaultPrevented => _defaultPrevented;
     bool _defaultPrevented = false;
   
     /**
  -   ** [name] - The name of the scope event.
  -   ** [targetScope] - The destination scope that is listening on the event.
  +   * [name] - The name of the scope event.
  +   * [targetScope] - The destination scope that is listening on the event.
      */
     ScopeEvent(this.name, this.targetScope, this.data);
   
  
positive.code:    */
    bool get isDestroyed {
      var scope = this;
      var root = rootScope;
      while(scope != null) {
        if (scope == root) {
          return false;
        }
        scope = scope._parentScope;
      }
      return true;
  
negative.code:         };
        } else if (expression.startsWith(':')) {
          expression = expression.substring(1);
          fn = (value, last) => value == null ? null : reactionFn(value, last);
        }
        ast = rootScope._astParser(expression, context: context, filters: filters);
      } else {
  