@Override
  public ASTNode findChildByRole(int role) {
    LOG.assertTrue(ChildRole.isUnique(role));
    switch (role) {
      case ChildRole.BREAK_KEYWORD: return findChildByType(JavaTokenType.BREAK_KEYWORD);
      case ChildRole.LABEL: return findChildByType(ElementType.EXPRESSION_BIT_SET);
      case ChildRole.CLOSING_SEMICOLON: return TreeUtil.findChildBackward(this, JavaTokenType.SEMICOLON);
      default: return null;
    }
  }
@Override
  public ASTNode findChildByRole(int role)