michael@0: var g = newGlobal();
michael@0: var k = g.eval('var u = new Object(); u');
michael@0: var m = new WeakMap();
michael@0: m.set(k, {});
michael@0: k = null;
michael@0: gc();
michael@0: k = g.eval('u');
michael@0: assertEq(m.has(k), true);