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Object.prototype.prototype = {};
assertEq(Object.getPrototypeOf([].concat()), Array.prototype);
assertEq(Object.getPrototypeOf([].map(x => x)), Array.prototype);
assertEq(Object.getPrototypeOf([].filter(x => x)), Array.prototype);
assertEq(Object.getPrototypeOf([].slice()), Array.prototype);
assertEq(Object.getPrototypeOf([].splice()), Array.prototype);