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function f(a) {
assertEq(arguments[0], 1);
Object.defineProperty(arguments, 0, {value: 23, writable: true, configurable: true});
assertEq(arguments[0], 23);
assertEq(a, 23);
a = 12;
assertEq(a, 12);
assertEq(arguments[0], 12);
Object.defineProperty(arguments, 0, {value: 9, writable: false, configurable: false});
assertEq(arguments[0], 9);
assertEq(a, 9);
a = 4;
assertEq(arguments[0], 9);
assertEq(a, 4);
}
f(1);
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