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// https://github.com/tc39/proposal-weakrefs/issues/39
// Weakref should keep the target until the end of current Job, that includes
// microtask(Promise).
let wr;
{
let obj = {};
wr = new WeakRef(obj);
obj = null;
}
// obj is out of block scope now, should be GCed.
gc();
assertEq(undefined == wr.deref(), false);
Promise.resolve().then(() => {
assertEq(undefined == wr.deref(), false);
});
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