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function f(useArg2, arg2, expect) {
var args = arguments;
if (useArg2)
args = arg2;
print(args)
assertEq(args.length, expect);
}
// Generate a PIC for arguments.
f(false, 0, 3);
f(false, 0, 3);
f(false, 0, 3);
// Now call it with a slow array.
var a = [1, 2, 3];
a.x = 9;
f(true, a, 3);