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diff --git a/deps/v8/test/mjsunit/string-charcodeat-external.js b/deps/v8/test/mjsunit/string-charcodeat-external.js
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@@ -0,0 +1,17 @@
+// Copyright 2018 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: --expose-externalize-string --expose-gc --allow-natives-syntax
+
+function foo(s) {
+ return s.charCodeAt(12);
+}
+
+var extern = "internalized dummy";
+extern = "1234567890qiaipppiúöäöáœba"+"jalsdjasldjasdlasjdalsdjasldk";
+externalizeString(extern, true /* force two-byte */);
+assertEquals(97, foo(extern));
+assertEquals(97, foo(extern));
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(97, foo(extern));