anchor.diff:  
     toString() => annotation.selector;
   }
  -
   
   class _ContainsSelector {
     final Directive annotation;
  
positive.code:  * DirectiveSelector is used by the [Compiler] during the template walking
   * to extract the [DirectiveRef]s.
   *
   * DirectiveSelector can be created using the [directiveSelectorFactory]
   * method.
   *
   * The DirectiveSelector supports CSS selectors which do not cross
   * element boundaries only. The selectors can have any mix of element-name,
  
negative.code:   }
    return parts;
  }
  