anchor.diff:    }
   
     @HostListener('keypress')
  +  @visibleForTemplate
     void handleKeyPress(KeyboardEvent event) {
       if (disabled) return;
       if (event.target != _root) return;
  
positive.code:   /// themeColor is applied to the checkbox even when the box is unchecked,
    /// which deviates from the standard material spec. Use mixin to set
    /// themeColor unless you want this behavior.
    @Input()
    String themeColor;
  
  
negative.code: 
    /// Unimplemented for M1.
    Future focusDelegate;
    void ngOnDestroy() {}
  }
  