Set-iterator-add-1.js

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// set.iterator() is live: entries added during iteration are visited.

var set = new Set([5]);

var log = '';

for (let x of set) {

    log += x + ';';

    if (x > 0)

        set.add(x - 1);

assertEq(log, '5;4;3;2;1;0;');

assertEq(set.size, 6);