code: def p_cellarray(p):
      
      if len(p) == 3:
          p[0] = node.cellarray(op="{}", args=node.expr_list())
      else:
          p[0] = node.cellarray(op="{}", args=p[2])
docs: cellarray : LBRACE RBRACE
                | LBRACE expr_list RBRACE
                | LBRACE concat_list RBRACE
                | LBRACE concat_list SEMI RBRACE