Update to use the latest analyzer

lib/runtime/dart/async.js

 var async;
 (function(exports) {
   'use strict';
   // Function _invokeErrorHandler: (Function, Object, StackTrace) → dynamic
   function _invokeErrorHandler(errorHandler, error, stackTrace) {
     if (dart.is(errorHandler, ZoneBinaryCallback)) {
       return dart.dinvokef(errorHandler, error, stackTrace);
     } else {
       return dart.dinvokef(errorHandler, error);
     }
@@ skipping 2908 matching lines @@
           result = addState.cancel();
         }
         this[_varData] = null;
         this[_state] = dart.notNull(this[_state]) & ~(dart.notNull(_StreamController[_STATE_SUBSCRIBED]) | dart.notNull(_StreamController[_STATE_ADDSTREAM])) | dart.notNull(_StreamController[_STATE_CANCELED]);
         if (this[_onCancel] != null) {
           if (result == null) {
             try {
               result = dart.as(this[_onCancel](), Future);
             } catch (e) {
               let s = dart.stackTrace(e);
-              result = ((_$) => {
-                _$[_asyncCompleteError](e, s);
-                return _$;
-              })(new _Future());
+              result = new _Future();
+              result[_asyncCompleteError](e, s);
             }
 
           } else {
             result = result.whenComplete(this[_onCancel]);
           }
         }
         // Function complete: () → void
         function complete() {
           if (dart.notNull(this[_doneFuture] != null) && dart.notNull(this[_doneFuture][_mayComplete])) {
             this[_doneFuture][_asyncComplete](null);
@@ skipping 2250 matching lines @@
   exports.ScheduleMicrotaskHandler = ScheduleMicrotaskHandler;
   exports.CreateTimerHandler = CreateTimerHandler;
   exports.CreatePeriodicTimerHandler = CreatePeriodicTimerHandler;
   exports.PrintHandler = PrintHandler;
   exports.ForkHandler = ForkHandler;
   exports.ZoneSpecification = ZoneSpecification;
   exports.ZoneDelegate = ZoneDelegate;
   exports.Zone = Zone;
   exports.runZoned = runZoned;
 })(async || (async = {}));