For/of mangling produces duplicated const names

[TrySound]

Bug report or Feature request?

Bug

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

terser 5.5.1

Complete CLI command or minify() options used

terser --module --mangle -o output.js input.js

terser input

export function Stave() {
    const beams = [];
    for (const [key, notes] of []) {
        const isUp = true;
        beams.push(isUp);
    }
}

terser output or error

// prettified output
export function Stave() {
  const o = [];
  for (const [t, n] of []) {
    const t = true;
    o.push(t);
  }
}

Expected result

Without conflicting consts

[fabiosantoscode]

Hey there @TrySound :)

Thanks for this report!

[fabiosantoscode]

Closing as the conversation on the other ticket didn't really find a bug. (for future reference, a duplicate t is fine in this case because the scope of const [t is not the same as the loop body's scope)