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deps/v8/test/mjsunit/ignition/string-concat-external-thin-string.js

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+// 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 --expose-externalize-string
+
+// Calculate string so that it isn't internalized.
+var string = createExternalizableString(((a, b) => {
+  return a + b;
+})('foo', 'bar'));
+
+// Now externalize it.
+externalizeString(string);
+
+// Then internalize it by using it as a keyed property name
+// to turn it a thin string.
+var obj = {};
+obj[string];
+
+// Perform a string concatination.
+assertEquals('"' + string + '"', '"foobar"');