Sequence ignored when it used in extends of unused class

[L2jLiga]

Bug report or Feature request?

Bug

Version (complete output of terser -V or specific git commit)

latest master

Complete CLI command or minify() options used

npx terser issue.js -c --toplevel

terser input

let x = "FAIL";
class A extends(x = "PASS", Object){}
console.log(x); // PASS

terser output or error

let x = "FAIL";
console.log(x); // FAIL

Expected result

let x = "FAIL";
x = "PASS";
console.log(x); // PASS

or

let x = "PASS";
console.log(x); // PASS

or

console.log("PASS"); // PASS

[fabiosantoscode]

Interesting corner case. Maybe this is a more general problem. Can you find more instances of sequences being ignored? Maybe sequences within AST_Export or AST_DefaultAssign?

[fabiosantoscode]

Maybe inside AST_Expansion too

[L2jLiga]

I'll try my best

[fabiosantoscode]

Just closed it @L2jLiga :)

[L2jLiga]

@fabiosantoscode very nice fix! But I see couple of todos 😉

[fabiosantoscode]

I probably forgot them there lol