diff --git a/test/mjsunit/es6/proxies-for.js b/test/mjsunit/es6/proxies-for.js
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+++ b/test/mjsunit/es6/proxies-for.js
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+// Copyright 2011 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Helper.
+
+function TestWithProxies(test, x, y, z) {
+  test(function(h){ return new Proxy({}, h) }, x, y, z)
+}
+
+
+// Iterate over a proxy.
+
+function TestForIn(properties, handler) {
+  TestWithProxies(TestForIn2, properties, handler)
+}
+
+function TestForIn2(create, properties, handler) {
+  var p = create(handler)
+  var found = []
+  for (var x in p) found.push(x)
+  assertArrayEquals(properties, found)
+}
+
+TestForIn(["0", "a"], {
+  ownKeys() { return ["0", "a"] },
+  has(target, property) { return true },
+  getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
+})
+
+TestForIn(["null", "a"], {
+  ownKeys() { return this.enumerate() },
+  enumerate() { return ["null", "a"] },
+  has(target, property) { return true },
+  getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
+})
+
+
+// Iterate over an object with a proxy prototype.
+
+function TestForInDerived(properties, handler) {
+  TestWithProxies(TestForInDerived2, properties, handler)
+}
+
+function TestForInDerived2(create, properties, handler) {
+  var p = create(handler)
+  var o = Object.create(p)
+  o.z = 0
+  var found = []
+  for (var x in o) found.push(x)
+  assertArrayEquals(["z"].concat(properties), found)
+
+  var oo = Object.create(o)
+  oo.y = 0
+  var found = []
+  for (var x in oo) found.push(x)
+  assertArrayEquals(["y", "z"].concat(properties), found)
+}
+
+TestForInDerived(["0", "a"], {
+  ownKeys: function() { return ["0", "a"] },
+  has: function(t, k) { return k == "0" || k == "a" },
+  getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
+})
+
+TestForInDerived(["null", "a"], {
+  ownKeys: function() { return this.enumerate() },
+  enumerate: function() { return ["null", "a"] },
+  has: function(t, k) { return k == "null" || k == "a" },
+  getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
+})
+
+
+
+// Throw exception in ownKeys trap.
+
+function TestForInThrow(handler) {
+  TestWithProxies(TestForInThrow2, handler)
+}
+
+function TestForInThrow2(create, handler) {
+  var p = create(handler)
+  var o = Object.create(p)
+  assertThrowsEquals(function(){ for (var x in p) {} }, "myexn")
+  assertThrowsEquals(function(){ for (var x in o) {} }, "myexn")
+}
+
+TestForInThrow({
+  ownKeys: function() { throw "myexn" }
+})
+
+TestForInThrow({
+  ownKeys: function() { return this.enumerate() },
+  enumerate: function() { throw "myexn" }
+})
+
+TestForInThrow(new Proxy({}, {
+  get: function(pr, pk) {
+    return function() { throw "myexn" }
+  }
+}));
+
+
+function keys(object) {
+  var keys = [];
+  for (var k in object) {
+    keys.push(k);
+  }
+  return keys;
+}
+
+(function testKeysProxyOnProtoEmpty() {
+  var p = new Proxy({}, {
+    ownKeys() { return []; },
+  });
+  var o = [0];
+  o.__proto__ = p;
+  assertEquals(["0"], keys(o));
+
+  delete o[0];
+  assertEquals([], keys(o));
+})();
+
+(function testKeysProxyOnProto() {
+  var handler = {ownKeys() { return ["0"]; }};
+  var proxy = new Proxy({}, handler);
+  var object = [0];
+  object.__proto__ = proxy;
+  assertEquals(["0"], keys(object));
+
+  // The Proxy doesn't set his ownKeys enumerable.
+  delete object[0];
+  assertEquals([], keys(object));
+
+  // The [[Has]] trap has no influence on which are enumerable properties are
+  // shown in for-in.
+  handler.has = function() { return true };
+  assertEquals([], keys(object));
+
+  handler.getOwnPropertyDescriptor = function() {
+    return {enumerable: true, configurable: true}
+  }
+  assertEquals(["0"], keys(object));
+})();
+
+(function testKeysProxyProto() {
+  var target = {t1:true, t2:true};
+  var handler = {};
+  var proxy = new Proxy(target, handler);
+
+  assertEquals(["t1", "t2"], keys(proxy));
+
+  target.__proto__ = {p1:true, p2:true};
+  assertEquals(["t1", "t2", "p1", "p2"], keys(proxy));
+
+  handler.getPrototypeOf = function(target) {
+    return {p3:true, p4:true};
+  };
+  // for-in walks the prototype chain for the [[Has]] / Enumerable check.
+  assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
+
+  // [[Has]] is not used in for-in.
+  handler.has = function() { return false };
+  assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
+
+  // Proxy intercepts enumerability check.
+  handler.getOwnPropertyDescriptor = function() {
+    return {enumerable: false, configurable: true}
+  }
+  assertEquals([], keys(proxy));
+
+  handler.getOwnPropertyDescriptor = function() {
+    return {enumerable: true, configurable: true}
+  }
+  assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
+
+  handler.getOwnPropertyDescriptor = function(target, key) {
+    return {
+      enumerable: key in target,
+      configurable: true
+    }
+  }
+  assertEquals(["t1", "t2"], keys(proxy));
+
+  handler.getPrototypeOf = function() { throw "error" };
+  assertThrowsEquals(() => {keys(proxy)}, "error");
+})();
+
+
+(function () {
+  var symbol = Symbol();
+  var p = new Proxy({}, {ownKeys() { return ["1", symbol, "2"] }});
+  assertEquals(["1","2"], Object.getOwnPropertyNames(p));
+  assertEquals([symbol], Object.getOwnPropertySymbols(p));
+})();