使用import() 时，解析出错；

代码中有用到 import() 语句。但是转化为AST时报错；
"recast": "^0.20.5"
`
const { parse } = require('recast');

const ast = parse('import(./a.js)');
`


Start by reproducing the reported parse call with recast ^0.20.5 and verify whether the import() example is valid JavaScript syntax. Then inspect the parser entry point used by recast and define done as correctly parsing a valid dynamic import without an AST error, with the expected behavior covered by a regression test.

Written by the indexing model from the issue text.