implement opassign, fix bugs in pre/postfix, introduce a let* helper

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 340 matching lines @@
   }
   // Function _callInIsolate: (_IsolateContext, Function) → dynamic
   function _callInIsolate(isolate, function$0) {
     let result = isolate.eval(function$0);
     exports._globalState.topEventLoop.run();
     return result;
   }
   let _activeJsAsyncCount = Symbol('_activeJsAsyncCount');
   // Function enterJsAsync: () → dynamic
   function enterJsAsync() {
-    exports._globalState.topEventLoop[_activeJsAsyncCount] = dart.notNull(exports._globalState.topEventLoop[_activeJsAsyncCount]) + 1;
+    let o$ = exports._globalState.topEventLoop;
+    o$[_activeJsAsyncCount] = dart.notNull(o$[_activeJsAsyncCount]) + 1;
   }
   // Function leaveJsAsync: () → dynamic
   function leaveJsAsync() {
-    exports._globalState.topEventLoop[_activeJsAsyncCount] = dart.notNull(exports._globalState.topEventLoop[_activeJsAsyncCount]) - 1;
+    let o$ = exports._globalState.topEventLoop;
+    o$[_activeJsAsyncCount] = dart.notNull(o$[_activeJsAsyncCount]) - 1;
     dart.assert(dart.notNull(exports._globalState.topEventLoop[_activeJsAsyncCount]) >= 0);
   }
   // Function isWorker: () → bool
   function isWorker() {
     return exports._globalState.isWorker;
   }
   // Function _currentIsolate: () → _IsolateContext
   function _currentIsolate() {
     return exports._globalState.currentContext;
   }
@@ skipping 98 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');
   let _close = Symbol('_close');
   class _IsolateContext extends core.Object {
     _IsolateContext() {
-      this.id = ((x$) => exports._globalState.nextIsolateId = dart.notNull(x$) + 1, x$)(exports._globalState.nextIsolateId);
+      this.id = ((o$, x$) => {
+        o$ = exports._globalState;
+        x$ = o$.nextIsolateId;
+        o$.nextIsolateId = dart.notNull(x$) + 1;
+        return x$;
+      })();
       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$(isolate.SendPort));
       this.initialized = false;
@@ skipping 503 matching lines @@
       let isSpawnUri = false;
       return IsolateNatives.spawn(name, null, null, message, isLight, isSpawnUri, startPaused);
     }
     static spawnUri(uri, args, message, startPaused) {
       IsolateNatives.enableSpawnWorker = true;
       let isLight = false;
       let isSpawnUri = true;
       return IsolateNatives.spawn(null, uri.toString(), args, message, isLight, isSpawnUri, startPaused);
     }
     static spawn(functionName, uri, args, message, isLight, isSpawnUri, startPaused) {
-      if (dart.notNull(uri != null) && dart.notNull(uri.endsWith(".dart")))
-        uri = ".js";
+      if (dart.notNull(uri != null) && dart.notNull(uri.endsWith(".dart"))) {
+        uri = core.String['+'](uri, ".js");
+      }
       let port = new isolate.ReceivePort();
       let completer = dart.as(new async.Completer(), async.Completer$(core.List));
       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));
         }
       });
@@ skipping 64 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$)(exports._globalState.nextManagerId);
+      let o$ = exports._globalState;
+      let workerId = o$.nextManagerId;
+      o$.nextManagerId = dart.notNull(workerId) + 1;
       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 ${uri}`;
       } else {
@@ skipping 80 matching lines @@
     get hashCode() {
       return dart.notNull(this[_workerId]) << 16 ^ dart.notNull(this[_isolateId]) << 8 ^ dart.notNull(this[_receivePortId]);
     }
   }
   _WorkerSendPort[dart.implements] = () => [isolate.SendPort];
   let _handler = Symbol('_handler');
   let _nextFreeId = Symbol('_nextFreeId');
   class RawReceivePortImpl extends core.Object {
     RawReceivePortImpl(handler) {
       this[_handler] = handler;
-      this[_id] = ((x$) => RawReceivePortImpl[_nextFreeId] = dart.notNull(x$) + 1, x$)(RawReceivePortImpl[_nextFreeId]);
+      this[_id] = ((x$) => (x$ = RawReceivePortImpl[_nextFreeId], RawReceivePortImpl[_nextFreeId] = dart.notNull(x$) + 1, x$))();
       this[_isClosed] = false;
       exports._globalState.currentContext.register(this[_id], this);
     }
     weak(handler) {
       this[_handler] = handler;
-      this[_id] = ((x$) => RawReceivePortImpl[_nextFreeId] = dart.notNull(x$) + 1, x$)(RawReceivePortImpl[_nextFreeId]);
+      this[_id] = ((x$) => (x$ = RawReceivePortImpl[_nextFreeId], RawReceivePortImpl[_nextFreeId] = dart.notNull(x$) + 1, x$))();
       this[_isClosed] = false;
       exports._globalState.currentContext.registerWeak(this[_id], this);
     }
     [_controlPort]() {
       this[_handler] = null;
       this[_id] = 0;
       this[_isClosed] = false;
     }
     set handler(newHandler) {
       this[_handler] = newHandler;
@@ skipping 133 matching lines @@
     CapabilityImpl() {
       this[_internal](_js_helper.random64());
     }
     [_internal](id) {
       this[_id] = id;
     }
     get hashCode() {
       let hash = this[_id];
       hash = dart.notNull(hash) >> 0 ^ (dart.notNull(hash) / 4294967296).truncate();
       hash = ~dart.notNull(hash) + (dart.notNull(hash) << 15) & 4294967295;
-      hash = dart.notNull(hash) >> 12;
+      hash = dart.notNull(hash) ^ dart.notNull(hash) >> 12;
       hash = dart.notNull(hash) * 5 & 4294967295;
-      hash = dart.notNull(hash) >> 4;
+      hash = dart.notNull(hash) ^ dart.notNull(hash) >> 4;
       hash = dart.notNull(hash) * 2057 & 4294967295;
-      hash = dart.notNull(hash) >> 16;
+      hash = dart.notNull(hash) ^ dart.notNull(hash) >> 16;
       return hash;
     }
     ['=='](other) {
       if (core.identical(other, this))
         return true;
       if (dart.is(other, CapabilityImpl)) {
         return core.identical(this[_id], other[_id]);
       }
       return false;
     }
   }
   CapabilityImpl[dart.implements] = () => [isolate.Capability];
   dart.defineNamedConstructor(CapabilityImpl, _internal);
   // Exports:
   exports.enterJsAsync = enterJsAsync;
   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 = {}));