src/third_party/mozjs-45/js/src/jit-test/tests/basic/testAccessCanonicalArgInGetElem.js

var o = {x:42};

function f(index,param) {
    arguments[1] = 0;
    var ret = 0;
    for (var i = 0; i < 5; ++i)
        ret = arguments[index].x;
    return ret;
}

assertEq(f(2,o,o), 42);
assertEq(f(1,o,o), undefined);