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deps/v8/test/mjsunit/es9/object-spread-ic-dontenum-transition.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 testMegamorphicWithDontEnumTransition() {
+  function spread(o) { return { ...o }; }
+
+  // Set up transition tree
+  let obj = { ...{}, a: 0, b: 1, c: 2, };
+  Object.defineProperty(obj, "boom", { enumerable: false, configurable: true,
+                                       writable: true });
+
+  // make CloneObjectIC MEGAMORPHIC
+  spread(new Proxy({}, {}));
+
+  // Ensure we don't crash, and create the correct object
+  let result = spread({ a: 0, b: 1, c: 2, boom: 3 });
+
+  assertEquals({ a: 0, b: 1, c: 2, boom: 3 }, result);
+  assertEquals({
+    enumerable: true,
+    writable: true,
+    configurable: true,
+    value: 3,
+  }, Object.getOwnPropertyDescriptor(result, "boom"));
+})();