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(() => {
let nextCalled = 0;
([])[Symbol.iterator]().__proto__.next = () => {
nextCalled++;
return {value: nextCalled, done: false};
};
assertEq(nextCalled, 0);
let [a,b] = [1,2,3];
assertEq(nextCalled, 2);
assertEq(a, 1);
assertEq(b, 2);
})();