// 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 foo(o) { try { for (var x in o) {} return false; } catch (e) { return true; } } %PrepareFunctionForOptimization(foo); var o = new Proxy({a:1},{ getOwnPropertyDescriptor(target, property) { throw target; } }); assertTrue(foo(o)); assertTrue(foo(o)); %OptimizeFunctionOnNextCall(foo); assertTrue(foo(o));