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(() => { var returnCalled = false; Object.defineProperty(globalThis, 'x', { get() { return 42; }, set(value) { ({}).__proto__.return = () => { returnCalled = true; return { value: 3, done: true }; }; } }); [x] = [1, 2]; assertEq(x, 42); assertEq(returnCalled, true); })();