v8/test/mjsunit/compiler/osr-block-scope-func.js

// Copyright 2015 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 --use-osr

"use strict";

function foo() {
  var result;
  {
    let sum = 0;
    for (var i = 0; i < 100; i++) {
      if (i == 50) %OptimizeOsr();
      sum += i;
    }
    result = ret;
    function ret() {
      return sum;
    }
  }
  return result;
}

%PrepareFunctionForOptimization(foo);
assertEquals(4950, foo()());
%PrepareFunctionForOptimization(foo);
assertEquals(4950, foo()());
%PrepareFunctionForOptimization(foo);
assertEquals(4950, foo()());