All private symbols are own symbols

test/mjsunit/harmony/private.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 223 matching lines @@
   for (var i = 1; i < symbols.length; i += 2) {
     Object.defineProperty(obj, symbols[i], {value: i, configurable: true})
   }
 }
 
 
 function TestKeyGet(obj) {
   var obj2 = Object.create(obj)
   for (var i in symbols) {
     assertEquals(i|0, obj[symbols[i]])
-    assertEquals(i|0, obj2[symbols[i]])
+    // Private symbols key own-properties.
+    assertEquals(undefined, obj2[symbols[i]])
   }
 }
 
 
 function TestKeyHas() {
   for (var i in symbols) {
     assertTrue(symbols[i] in obj)
     assertTrue(Object.hasOwnProperty.call(obj, symbols[i]))
   }
 }
@@ skipping 90 matching lines @@
   obj[sym] = 1
   freeze(obj)
   obj[sym] = 2
   assertEquals(2, obj[sym])
   assertTrue(delete obj[sym])
   assertEquals(undefined, obj[sym])
 }
 TestSealAndFreeze(Object.seal)
 TestSealAndFreeze(Object.freeze)
 TestSealAndFreeze(Object.preventExtensions)
+
+
+var s = %CreatePrivateSymbol("s");
+var s1 = %CreatePrivateSymbol("s1");
+
+function TestSimple() {
+  var p = {}
+  p[s] = "moo";
+
+  var o = Object.create(p);
+
+  assertEquals(undefined, o[s]);
+  assertEquals("moo", p[s]);
+
+  o[s] = "bow-wow";
+  assertEquals("bow-wow", o[s]);
+  assertEquals("moo", p[s]);
+}
+TestSimple();
+
+
+function TestICs() {
+  var p = {}
+  p[s] = "moo";
+
+
+  var o = Object.create(p);
+  o[s1] = "bow-wow";
+  function checkNonOwn(o) {
+    assertEquals(undefined, o[s]);
+    assertEquals("bow-wow", o[s1]);
+  }
+
+  checkNonOwn(o);
+
+  // Test monomorphic/optimized.
+  for (var i = 0; i < 1000; i++) {
+    checkNonOwn(o);
+  }
+
+  // Test non-monomorphic.
+  for (var i = 0; i < 1000; i++) {
+    var oNew = Object.create(p);
+    oNew["s" + i] = i;
+    oNew[s1] = "bow-wow";
+    checkNonOwn(oNew);
+  }
+}
+TestICs();