code: def p_cellarrayref(p):
      
      args = node.expr_list() if len(p) == 4 else p[3]
      assert isinstance(args, node.expr_list)
      p[0] = node.cellarrayref(func_expr=p[1], args=args)
docs: expr : expr LBRACE expr_list RBRACE
              | expr LBRACE RBRACE