minifier: dce + var hosting edge cases #7209
Description
Input
if (false) {
for (var a; unknownGlobal && true; unknownGlobal && true) var b;
} else {
console.log(a, b);
}
if (((() => console.log('effect'))(), true)) {
} else {
var c = 1;
for (var c; unknownGlobal && true; unknownGlobal && true) var d;
}
console.log(c, d);Output
console.log(a, b);
console.log(c, d);Expected
var b, a; {
console.log(a, b);
}
var c, d; if (((() => console.log('effect'))(), true)) ;
console.log(c, d);The a,b,c,d need to hosted, the ((() => console.log('effect'))() need to preserve.
Found the case at https://github.com/rollup/rollup/blob/master/test/form/samples/hoisted-vars-in-dead-branches/main.js