|  | // Copyright 2019 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 | 
|  | function f() { | 
|  | // Loop with a body that's not wrapped in a block. | 
|  | for (i = 0; i < 2; i++) | 
|  | var x = i, // var x that's assigned on each iteration | 
|  | y = y||(()=>x), // single arrow function that returns x | 
|  | z0 = (%PrepareFunctionForOptimization(y)), // prepare function for optimization | 
|  | z = (%OptimizeFunctionOnNextCall(y), y()); // optimize y on first iteration | 
|  | return y() | 
|  | }; | 
|  | assertEquals(1, f()) |