src/third_party/v8/test/mjsunit/regress/regress-crbug-624747.js

// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax --es-staging

"use strict";

function bar() {
  try {
    unref;
  } catch (e) {
    return 1 instanceof TypeError && unref();  // Call in tail position!
  }
}

function foo() {
  return bar();  // Call in tail position!
};
%PrepareFunctionForOptimization(foo);
%OptimizeFunctionOnNextCall(foo);
foo();