bug-2017622.js - mozsearch

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gczeal(0);

gcparam('perZoneGCEnabled', 1);

const count = 5;

let g = newGlobal({newCompartment: true});

g.evaluate(`symbols = [];`);

function makeList() {

  let element = {};

  for (let i = 0; i < count; i++) {

    let symbol = Symbol();

    g.symbols.push(symbol);

    let wm = new WeakMap();

    wm.set(symbol, element);

    element = wm;

  return element;

function checkList(list) {

  let element = list;

  for (let i = 0; i < count; i++) {

    assertEq(element instanceof WeakMap, true);

    assertEq(nondeterministicGetWeakMapSize(element), 1);

    let key = nondeterministicGetWeakMapKeys(element)[0];

    assertEq(key, g.symbols[count - i - 1]);

    element = element.get(key);

  assertEq(element instanceof WeakMap, false);

let list = makeList();

checkList(list);

gc();

gc();

schedulezone(this);

schedulezone('atoms');

startgc(1);

while (gcstate() !== 'NotActive') { gcslice(1000); }

checkList(list);