src/third_party/mozjs-45/js/src/jit-test/tests/ion/bug798819.js

if (!this.gcPreserveCode)
    gcPreserveCode = function() {};
this.toString = (function() {
  x.filter(function() {})
});
x = [0, 0, 0, 0, 0, 0, 0];
gcPreserveCode()
print(this)
gc();
this + ''