src/third_party/mozjs-45/js/src/jit-test/tests/ion/bug780842.js

// |jit-test| ion-eager;error:TypeError

function testUKeyUObject(a, key1, key2, key3) {
    assertEq(a[-1](), "hi");
}
for (var i = 0; i < 5; i++) {
    testUKeyUObject({}, "a", "b", "c");
}