Important Semicolon Is Removed

[anliting]

With these files:

a.mjs:

import rollup from 'rollup'
;(async()=>{
    let
        bundle=await rollup.rollup({input:'b.mjs'}),
        {code}=await bundle.generate({format:'iife'})
    console.log(code)
})()

b.mjs:

import c from './c.mjs'
;(()=>{
    console.log(c)
})()

c.mjs:

export default 0

Run: $ node --experimental a.mjs

Output:

(function () {
    'use strict';

    var c = 0

    (()=>{
        console.log(c);
    })();

}());

Expected: At least one semicolon between var c = 0 and (()=>{.

$ node -v: v9.10.1
$ npm -v rollup: 5.8.0

[guybedford]

I can confirm this with replication at - https://rollupjs.org/repl?version=0.58.0&shareable=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