src/third_party/mozjs-45/js/src/jit-test/tests/ion/bug870328.js

var g = newGlobal("same-compartment");
try {
    evalcx("'use strict'; (function() { x = 33; })()", g);
    assertEq(0, 1);
} catch(e) {
    assertEq(e.toString().includes("variable x"), true);
}