src/third_party/mozjs-45/js/src/jit-test/tests/basic/testGlobalOptimize-5.js

var test;
function f() {
  {
    let a = 5;
    with ({a: 2}) {
      test = (function () { return a;} )();
    }
  }
}
f();
assertEq(test, 2);