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deps/v8/test/mjsunit/compiler/regress-377213712-3.js

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+// Copyright 2024 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) {
+  o.x = 42;
+}
+
+%PrepareFunctionForOptimization(foo);
+let o1 = new String("abc");
+foo(o1);
+assertEquals(42, o1.x);
+
+let o2 = new String("def");
+o2.y = 17;
+foo(o2);
+assertEquals(42, o2.x);
+
+%OptimizeFunctionOnNextCall(foo);
+let o3 = new String("ghi");
+foo(o3);
+assertEquals(42, o3.x);