Handle for-in loops

lib/runtime/dart/_isolate_helper.js

 var _isolate_helper;
 (function(exports) {
   'use strict';
   // Function _serializeMessage: (dynamic) → dynamic
   function _serializeMessage(message) {
     return new _Serializer().serialize(message);
   }
   // Function _deserializeMessage: (dynamic) → dynamic
   function _deserializeMessage(message) {
     return new _Deserializer().deserialize(message);
@@ skipping 692 matching lines @@
         exports._globalState.isolates.set(this.id, this);
       } else {
         this.kill();
       }
     }
     kill() {
       if (this[_scheduledControlEvents] != null) {
         dart.dinvoke(this[_scheduledControlEvents], 'clear');
       }
       for (let port of this.ports.values) {
-        dart.dinvoke(port, '_close');
+        port._close();
       }
       this.ports.clear();
       this.weakPorts.clear();
       exports._globalState.isolates.remove(this.id);
       this.errorPorts.clear();
       if (this.doneHandlers != null) {
-        for (let port of this.doneHandlers) {
+        for (let port of dart.as(this.doneHandlers, core.Iterable$(isolate.SendPort))) {
           port.send(null);
         }
         this.doneHandlers = null;
       }
     }
     unregister(portId) {
       this.ports.remove(portId);
       this.weakPorts.remove(portId);
       this[_updateGlobalState]();
     }
@@ skipping 641 matching lines @@
   exports.leaveJsAsync = leaveJsAsync;
   exports.isWorker = isWorker;
   exports.startRootIsolate = startRootIsolate;
   exports.IsolateNatives = IsolateNatives;
   exports.RawReceivePortImpl = RawReceivePortImpl;
   exports.ReceivePortImpl = ReceivePortImpl;
   exports.TimerImpl = TimerImpl;
   exports.hasTimer = hasTimer;
   exports.CapabilityImpl = CapabilityImpl;
 })(_isolate_helper || (_isolate_helper = {}));