michael@0: function f(a, b, c, ...rest) {
michael@0:     assertEq(a, 1);
michael@0:     assertEq(b, undefined);
michael@0:     assertEq(c, undefined);
michael@0:     assertEq(Array.isArray(rest), true);
michael@0:     assertEq(rest.length, 0);
michael@0:     assertEq(Object.getPrototypeOf(rest), Array.prototype);
michael@0: }
michael@0: f(1);