| // Copyright 2017 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([x]) { yield x } | |
| // No warm-up of {f} to trigger soft deopt. | |
| %OptimizeFunctionOnNextCall(f); | |
| var gen = f([23]); | |
| assertEquals("[object Generator]", gen.toString()); | |
| assertEquals({ done:false, value:23 }, gen.next()); | |
| assertEquals({ done:true, value:undefined }, gen.next()); |