anchor.diff:  
     @override
     noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
  -
  -  /**
  -   * Throw away any information produced by type inference.
  -   */
  -  void unlink() {
  -    _inferredType = null;
  -  }
   }
   
   /**
  
positive.code: 
    @override
    noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
  
    /**
     * Throw away any information produced by a previous call to [link].
     */
    void unlink();
  }
  
  /**
  
negative.code:   }
  
    /**
     * Throw away any information stored in the summary by a previous call to
     * [link].
     */
    void unlink() {
      for (LibraryElementInBuildUnit library in _librariesInBuildUnit) {
  