weakRef_in_promise.js

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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);

});