src/third_party/mozjs-45/js/src/jit-test/tests/ion/bug827659-1.js

function f() {
    return y.byteOffset;
}
var y;
for (var j = 0; j < 1; ++j) {
    y = new Float32Array();
}
f();
y = 0;
assertEq(f(), undefined);
assertEq(f(), undefined);