cellarray : LBRACE RBRACE
              | LBRACE expr_list RBRACE
              | LBRACE concat_list RBRACE
              | LBRACE concat_list SEMI RBRACE

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