src/v8/test/mjsunit/regress/string-fromcharcode-sideeffect.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.

var counter = 0;
var a = { valueOf: function() { counter++; return 0x100; } };
assertEquals("A\u0100\u0100\u0100", String.fromCharCode(65, a, a, a));
assertEquals(3, counter);