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deps/v8/test/mjsunit/es9/object-spread-ic-multiple-transitions.js

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+// 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.
+
+(function testMegamorphicWithNonSimpleTransitionHandler() {
+  function spread(o) { return { ...o }; }
+
+  // Set up transition tree
+  let obj = { ...{}, a: 0, b: 1, boom: 2};
+
+  // make CloneObjectIC MEGAMORPHIC
+  spread(new Proxy({}, {}));
+
+  // Ensure we don't crash, and create the correct object
+  assertEquals({ a: 0, b: 1, c: 2 }, spread({ a: 0, b: 1, c: 2 }));
+})();