Remove the Proxy enumerate trap

test/mjsunit/harmony/proxies-enumerate.js

-// Copyright 2015 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: --harmony-proxies
-
-var target = {
-  "target_one": 1
-};
-target.__proto__ = {
-  "target_two": 2
-};
-var handler = {
-  enumerate: function(target) {
-    function* keys() {
-      yield "foo";
-      yield "bar";
-    }
-    return keys();
-  },
-  // For-in calls "has" on every iteration, so for TestForIn() below to
-  // detect all results of the "enumerate" trap, "has" must return true.
-  has: function(target, name) {
-    return true;
-  }
-}
-
-var proxy = new Proxy(target, handler);
-
-function TestForIn(receiver, expected) {
-  var result = [];
-  for (var k in receiver) {
-    result.push(k);
-  }
-  assertEquals(expected, result);
-}
-
-TestForIn(proxy, ["foo", "bar"]);
-
-// Test revoked proxy.
-var pair = Proxy.revocable(target, handler);
-TestForIn(pair.proxy, ["foo", "bar"]);
-pair.revoke();
-assertThrows(()=>{ TestForIn(pair.proxy, ["foo", "bar"]) }, TypeError);
-
-// Properly call traps on proxies on the prototype chain.
-var receiver = {
-  "receiver_one": 1
-};
-receiver.__proto__ = proxy;
-TestForIn(receiver, ["receiver_one", "foo", "bar"]);
-
-// Fall through to default behavior when trap is undefined.
-handler.enumerate = undefined;
-TestForIn(proxy, ["target_one", "target_two"]);
-delete handler.enumerate;
-TestForIn(proxy, ["target_one", "target_two"]);
-
-// Non-string keys must be filtered.
-function TestNonStringKey(key) {
-  handler.enumerate = function(target) {
-    function* keys() { yield key; }
-    return keys();
-  }
-  assertThrows("for (var k in proxy) {}", TypeError);
-}
-
-TestNonStringKey(1);
-TestNonStringKey(3.14);
-TestNonStringKey(Symbol("foo"));
-TestNonStringKey({bad: "value"});
-TestNonStringKey(null);
-TestNonStringKey(undefined);
-TestNonStringKey(true);
-
-(function testProtoProxyEnumerate() {
-  var keys = ['a', 'b', 'c', 'd'];
-  var handler = {
-   enumerate() { return keys[Symbol.iterator]() },
-   has(target, key) { return false }
-  };
-  var proxy = new Proxy({}, handler);
-  var seen_keys = [];
-  for (var i in proxy) {
-    seen_keys.push(i);
-  }
-  assertEquals([], seen_keys);
-
-  handler.has = function(target, key) { return true };
-  for (var i in proxy) {
-    seen_keys.push(i);
-  }
-  assertEquals(keys, seen_keys);
-
-  o = {__proto__:proxy};
-  handler.has = function(target, key) { return false };
-  seen_keys = [];
-  for (var i in o) {
-    seen_keys.push(i);
-  }
-  assertEquals([], seen_keys);
-
-  handler.has = function(target, key) { return true };
-  seen_keys = [];
-  for (var i in o) {
-    seen_keys.push(i);
-  }
-  assertEquals(keys, seen_keys);
-})();