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(() => {
let returnCalled = false;
({}).__proto__.return = () => {
returnCalled = true;
return { value: 3, done: true };
};
assertEq(returnCalled, false);
let [a,b] = [1,2,3];
assertEq(returnCalled, true);
assertEq(a, 1);
assertEq(b, 2);
})();