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function f() {
var a = arguments;
eval("assertEq(arguments[0], 42)");
eval("assertEq(arguments, a)");
arguments = undefined;
eval("assertEq(arguments, undefined)");
arguments = a;
eval("assertEq(arguments[0], 42)");
eval("assertEq(arguments, a)");
}
f(42);
function f(z) {
var a = arguments;
eval("assertEq(arguments[0], 42)");
eval("assertEq(arguments, a)");
arguments = undefined;
eval("assertEq(arguments, undefined)");
z = 17;
eval("assertEq(a[0], 17)");
a[0] = 'ponies';
eval("assertEq(z, 'ponies')");
}
f(42);