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let obj = { a: 1, b: 2, c: 3 };
let { a, ...rest } = obj;
assertEq(Object.keys(rest).length, 2);
let obj1 = { a: 1, b: 2, c: 3 };
let { ...rest1 } = obj;
assertEq(Object.keys(rest1).length, 3);