move => bind this workaround to js_ast

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 460 matching lines @@
     }
   }
   let _controlPort = Symbol('_controlPort');
   let _scheduledControlEvents = Symbol('_scheduledControlEvents');
   let _isExecutingEvent = Symbol('_isExecutingEvent');
   let _updateGlobalState = Symbol('_updateGlobalState');
   let _setGlobals = Symbol('_setGlobals');
   let _addRegistration = Symbol('_addRegistration');
   class _IsolateContext extends core.Object {
     _IsolateContext() {
-      this.id = ((x$) => exports._globalState.nextIsolateId = dart.notNull(x$) + 1, x$).bind(this)(exports._globalState.nextIsolateId);
+      this.id = ((x$) => exports._globalState.nextIsolateId = dart.notNull(x$) + 1, x$)(exports._globalState.nextIsolateId);
       this.ports = new (core.Map$(core.int, RawReceivePortImpl))();
       this.weakPorts = new (core.Set$(core.int))();
       this.isolateStatics = _foreign_helper.JS_CREATE_ISOLATE();
       this.controlPort = new RawReceivePortImpl[_controlPort]();
       this.pauseCapability = new isolate.Capability();
       this.terminateCapability = new isolate.Capability();
       this.delayedEvents = dart.as(new core.List.from([]), core.List$(_IsolateEvent));
       this.pauseTokens = dart.as(new core.Set(), core.Set$(isolate.Capability));
       this.errorPorts = dart.as(new core.Set(), core.Set$(isolate.SendPort));
       this.initialized = false;
@@ skipping 506 matching lines @@
       IsolateNatives.enableSpawnWorker = true;
       let isLight = false;
       let isSpawnUri = true;
       return IsolateNatives.spawn(null, uri.toString(), args, message, isLight, isSpawnUri, startPaused);
     }
     static spawn(functionName, uri, args, message, isLight, isSpawnUri, startPaused) {
       if (dart.notNull(uri != null) && dart.notNull(uri.endsWith(".dart")))
         uri = ".js";
       let port = new isolate.ReceivePort();
       let completer = dart.as(new async.Completer(), async.Completer$(core.List));
-      port.first.then(((msg) => {
+      port.first.then((msg) => {
         if (dart.equals(dart.dindex(msg, 0), _SPAWNED_SIGNAL)) {
           completer.complete(msg);
         } else {
           dart.assert(dart.equals(dart.dindex(msg, 0), _SPAWN_FAILED_SIGNAL));
           completer.completeError(dart.dindex(msg, 1));
         }
-      }).bind(this));
+      });
       let signalReply = port.sendPort;
       if (dart.notNull(exports._globalState.useWorkers) && !dart.notNull(isLight)) {
-        IsolateNatives[_startWorker](functionName, uri, args, message, isSpawnUri, startPaused, signalReply, ((message) => completer.completeError(message)).bind(this));
+        IsolateNatives[_startWorker](functionName, uri, args, message, isSpawnUri, startPaused, signalReply, (message) => completer.completeError(message));
       } else {
         IsolateNatives[_startNonWorker](functionName, uri, args, message, isSpawnUri, startPaused, signalReply);
       }
       return completer.future;
     }
     static [_startWorker](functionName, uri, args, message, isSpawnUri, startPaused, replyPort, onError) {
       if (args != null)
         args = new core.List$(core.String).from(args);
       if (exports._globalState.isWorker) {
         exports._globalState.mainManager.postMessage(_serializeMessage(dart.map({command: 'spawn-worker', functionName: functionName, args: args, msg: message, uri: uri, isSpawnUri: isSpawnUri, startPaused: startPaused, replyPort: replyPort})));
@@ skipping 51 matching lines @@
         };
       }(_foreign_helper.DART_CLOSURE_TO_JS(IsolateNatives.workerOnError), uri, onError);
       worker.onerror = onerrorTrampoline;
       let processWorkerMessageTrampoline = function(f, a) {
         return function(e) {
           e.onerror = null;
           return f(a, e);
         };
       }(_foreign_helper.DART_CLOSURE_TO_JS(IsolateNatives[_processWorkerMessage]), worker);
       worker.onmessage = processWorkerMessageTrampoline;
-      let workerId = ((x$) => exports._globalState.nextManagerId = dart.notNull(x$) + 1, x$).bind(this)(exports._globalState.nextManagerId);
+      let workerId = ((x$) => exports._globalState.nextManagerId = dart.notNull(x$) + 1, x$)(exports._globalState.nextManagerId);
       IsolateNatives.workerIds.set(worker, workerId);
       exports._globalState.managers.set(workerId, worker);
       worker.postMessage(_serializeMessage(dart.map({command: 'start', id: workerId, replyTo: _serializeMessage(replyPort), args: args, msg: _serializeMessage(message), isSpawnUri: isSpawnUri, startPaused: startPaused, functionName: functionName})));
     }
     static workerOnError(event, uri, onError) {
       event.preventDefault();
       let message = dart.as(event.message, core.String);
       if (message == null) {
         message = `Error spawning worker for ${uri}`;
       } else {
@@ skipping 271 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 = {}));