Replace dart_core.js with actual compiled SDK

test/codegen/expect/dart/async.js

Index: test/codegen/expect/dart/async.js
diff --git a/test/codegen/expect/dart/async.js b/test/codegen/expect/dart/async.js
deleted file mode 100644
index 5e48d60feed555dfa4c7a12f14411b980cf063e7..0000000000000000000000000000000000000000
--- a/test/codegen/expect/dart/async.js
+++ /dev/null
@@ -1,4952 +0,0 @@
-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);
-    }
-  }
-  // Function _registerErrorHandler: (Function, Zone) → Function
-  function _registerErrorHandler(errorHandler, zone) {
-    if (dart.is(errorHandler, ZoneBinaryCallback)) {
-      return zone.registerBinaryCallback(errorHandler);
-    } else {
-      return zone.registerUnaryCallback(dart.as(errorHandler, dart.throw_("Unimplemented type (dynamic) → dynamic")));
-    }
-  }
-  let _getBestStackTrace = Symbol('_getBestStackTrace');
-  class AsyncError extends core.Object {
-    AsyncError(error, stackTrace) {
-      this.error = error;
-      this.stackTrace = stackTrace;
-    }
-    toString() {
-      return dart.as(dart.dinvoke(this.error, 'toString'), core.String);
-    }
-  }
-  class _UncaughtAsyncError extends AsyncError {
-    _UncaughtAsyncError(error, stackTrace) {
-      super.AsyncError(error, _getBestStackTrace(error, stackTrace));
-    }
-    static [_getBestStackTrace](error, stackTrace) {
-      if (stackTrace !== null)
-        return stackTrace;
-      if (dart.is(error, core.Error)) {
-        return dart.as(dart.dload(error, 'stackTrace'), core.StackTrace);
-      }
-      return null;
-    }
-    toString() {
-      let result = `Uncaught Error: ${this.error}`;
-      if (this.stackTrace !== null) {
-        result = `\nStack Trace:\n${this.stackTrace}`;
-      }
-      return result;
-    }
-  }
-  let _controller = Symbol('_controller');
-  let _createSubscription = Symbol('_createSubscription');
-  let _onListen = Symbol('_onListen');
-  let _addError = Symbol('_addError');
-  let _completeError = Symbol('_completeError');
-  let _complete = Symbol('_complete');
-  let _sink = Symbol('_sink');
-  let Stream$ = dart.generic(function(T) {
-    class Stream extends core.Object {
-      Stream() {
-      }
-      Stream$fromFuture(future) {
-        let controller = dart.as(new StreamController({sync: true}), _StreamController$(T));
-        future.then(dart.closureWrap(((value) => {
-          controller._add(dart.as(value, T));
-          controller._closeUnchecked();
-        }).bind(this), "(T) → dynamic"), {onError: ((error, stackTrace) => {
-            controller._addError(error, dart.as(stackTrace, core.StackTrace));
-            controller._closeUnchecked();
-          }).bind(this)});
-        return controller.stream;
-      }
-      Stream$fromIterable(data) {
-        return new _GeneratedStreamImpl(() => new _IterablePendingEvents(data));
-      }
-      Stream$periodic(period, computation) {
-        if (computation === void 0)
-          computation = null;
-        if (computation === null)
-          computation = dart.closureWrap((i) => null, "(int) → T");
-        let timer = null;
-        let computationCount = 0;
-        let controller = null;
-        let watch = new core.Stopwatch();
-        // Function sendEvent: () → void
-        function sendEvent() {
-          watch.reset();
-          let data = computation((($tmp) => computationCount = dart.notNull($tmp) + 1, $tmp)(computationCount));
-          controller.add(data);
-        }
-        // Function startPeriodicTimer: () → void
-        function startPeriodicTimer() {
-          dart.assert(timer === null);
-          timer = new Timer.periodic(period, (timer) => {
-            sendEvent();
-          });
-        }
-        controller = new StreamController({sync: true, onListen: (() => {
-            watch.start();
-            startPeriodicTimer();
-          }).bind(this), onPause: (() => {
-            timer.cancel();
-            timer = null;
-            watch.stop();
-          }).bind(this), onResume: (() => {
-            dart.assert(timer === null);
-            let elapsed = watch.elapsed;
-            watch.start();
-            timer = new Timer(period['-'](elapsed), () => {
-              timer = null;
-              startPeriodicTimer();
-              sendEvent();
-            });
-          }).bind(this), onCancel: (() => {
-            if (timer !== null)
-              timer.cancel();
-            timer = null;
-          }).bind(this)});
-        return controller.stream;
-      }
-      Stream$eventTransformed(source, mapSink) {
-        return dart.as(new _BoundSinkStream(source, dart.closureWrap(mapSink, "(EventSink<dynamic>) → EventSink")), Stream$(T));
-      }
-      get isBroadcast() {
-        return false;
-      }
-      asBroadcastStream(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        return new _AsBroadcastStream(this, dart.closureWrap(onListen, "(StreamSubscription<dynamic>) → void"), dart.closureWrap(onCancel, "(StreamSubscription<dynamic>) → void"));
-      }
-      where(test) {
-        return new _WhereStream(this, test);
-      }
-      map(convert) {
-        return new _MapStream(this, convert);
-      }
-      asyncMap(convert) {
-        let controller = null;
-        let subscription = null;
-        // Function onListen: () → void
-        function onListen() {
-          let add = controller.add;
-          dart.assert(dart.notNull(dart.is(controller, _StreamController)) || dart.notNull(dart.is(controller, _BroadcastStreamController)));
-          let eventSink = controller;
-          let addError = eventSink[_addError];
-          subscription = this.listen(((event) => {
-            let newValue = null;
-            try {
-              newValue = convert(event);
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              controller.addError(e, s);
-              return;
-            }
-
-            if (dart.is(newValue, Future)) {
-              subscription.pause();
-              dart.dinvoke(dart.dinvoke(newValue, 'then', add, {onError: addError}), 'whenComplete', subscription.resume);
-            } else {
-              controller.add(newValue);
-            }
-          }).bind(this), {onError: dart.as(addError, core.Function), onDone: controller.close});
-        }
-        if (this.isBroadcast) {
-          controller = new StreamController.broadcast({onListen: onListen, onCancel: (() => {
-              subscription.cancel();
-            }).bind(this), sync: true});
-        } else {
-          controller = new StreamController({onListen: onListen, onPause: (() => {
-              subscription.pause();
-            }).bind(this), onResume: (() => {
-              subscription.resume();
-            }).bind(this), onCancel: (() => {
-              subscription.cancel();
-            }).bind(this), sync: true});
-        }
-        return controller.stream;
-      }
-      asyncExpand(convert) {
-        let controller = null;
-        let subscription = null;
-        // Function onListen: () → void
-        function onListen() {
-          dart.assert(dart.notNull(dart.is(controller, _StreamController)) || dart.notNull(dart.is(controller, _BroadcastStreamController)));
-          let eventSink = controller;
-          subscription = this.listen(((event) => {
-            let newStream = null;
-            try {
-              newStream = convert(event);
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              controller.addError(e, s);
-              return;
-            }
-
-            if (newStream !== null) {
-              subscription.pause();
-              controller.addStream(newStream).whenComplete(subscription.resume);
-            }
-          }).bind(this), {onError: dart.as(eventSink[_addError], core.Function), onDone: controller.close});
-        }
-        if (this.isBroadcast) {
-          controller = new StreamController.broadcast({onListen: onListen, onCancel: (() => {
-              subscription.cancel();
-            }).bind(this), sync: true});
-        } else {
-          controller = new StreamController({onListen: onListen, onPause: (() => {
-              subscription.pause();
-            }).bind(this), onResume: (() => {
-              subscription.resume();
-            }).bind(this), onCancel: (() => {
-              subscription.cancel();
-            }).bind(this), sync: true});
-        }
-        return controller.stream;
-      }
-      handleError(onError, opt$) {
-        let test = opt$.test === void 0 ? null : opt$.test;
-        return new _HandleErrorStream(this, onError, test);
-      }
-      expand(convert) {
-        return new _ExpandStream(this, convert);
-      }
-      pipe(streamConsumer) {
-        return streamConsumer.addStream(this).then(((_) => streamConsumer.close()).bind(this));
-      }
-      transform(streamTransformer) {
-        return streamTransformer.bind(this);
-      }
-      reduce(combine) {
-        let result = new _Future();
-        let seenFirst = false;
-        let value = null;
-        let subscription = null;
-        subscription = this.listen((element) => {
-          if (seenFirst) {
-            _runUserCode(() => combine(value, element), (newValue) => {
-              value = newValue;
-            }, dart.as(_cancelAndErrorClosure(subscription, result), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-          } else {
-            value = element;
-            seenFirst = true;
-          }
-        }, {onError: result[_completeError], onDone: (() => {
-            if (!dart.notNull(seenFirst)) {
-              try {
-                throw _internal.IterableElementError.noElement();
-              } catch (e) {
-                let s = dart.stackTrace(e);
-                _completeWithErrorCallback(result, e, s);
-              }
-
-            } else {
-              result._complete(value);
-            }
-          }).bind(this), cancelOnError: true});
-        return result;
-      }
-      fold(initialValue, combine) {
-        let result = new _Future();
-        let value = initialValue;
-        let subscription = null;
-        subscription = this.listen((element) => {
-          _runUserCode(() => dart.dinvokef(combine, value, element), (newValue) => {
-            value = newValue;
-          }, dart.as(_cancelAndErrorClosure(subscription, result), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: ((e, st) => {
-            result._completeError(e, dart.as(st, core.StackTrace));
-          }).bind(this), onDone: (() => {
-            result._complete(value);
-          }).bind(this), cancelOnError: true});
-        return result;
-      }
-      join(separator) {
-        if (separator === void 0)
-          separator = "";
-        let result = new _Future();
-        let buffer = new core.StringBuffer();
-        let subscription = null;
-        let first = true;
-        subscription = this.listen(((element) => {
-          if (!dart.notNull(first)) {
-            buffer.write(separator);
-          }
-          first = false;
-          try {
-            buffer.write(element);
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _cancelAndErrorWithReplacement(subscription, result, e, s);
-          }
-
-        }).bind(this), {onError: ((e) => {
-            result._completeError(e);
-          }).bind(this), onDone: (() => {
-            result._complete(buffer.toString());
-          }).bind(this), cancelOnError: true});
-        return result;
-      }
-      contains(needle) {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((element) => {
-          _runUserCode(() => dart.equals(element, needle), (isMatch) => {
-            if (isMatch) {
-              _cancelAndValue(subscription, future, true);
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            future._complete(false);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      forEach(action) {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((element) => {
-          _runUserCode(() => action(element), (_) => {
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            future._complete(null);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      every(test) {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((element) => {
-          _runUserCode(() => test(element), (isMatch) => {
-            if (!dart.notNull(isMatch)) {
-              _cancelAndValue(subscription, future, false);
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            future._complete(true);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      any(test) {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((element) => {
-          _runUserCode(() => test(element), (isMatch) => {
-            if (isMatch) {
-              _cancelAndValue(subscription, future, true);
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            future._complete(false);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      get length() {
-        let future = new _Future();
-        let count = 0;
-        this.listen(dart.closureWrap((_) => {
-          count = dart.notNull(count) + 1;
-        }, "(T) → void"), {onError: future[_completeError], onDone: (() => {
-            future._complete(count);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      get isEmpty() {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen(dart.closureWrap((_) => {
-          _cancelAndValue(subscription, future, false);
-        }, "(T) → void"), {onError: future[_completeError], onDone: (() => {
-            future._complete(true);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      toList() {
-        let result = new List.from([]);
-        let future = new _Future();
-        this.listen(((data) => {
-          result.add(data);
-        }).bind(this), {onError: future[_completeError], onDone: (() => {
-            future._complete(result);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      toSet() {
-        let result = new core.Set();
-        let future = new _Future();
-        this.listen(((data) => {
-          result.add(data);
-        }).bind(this), {onError: future[_completeError], onDone: (() => {
-            future._complete(result);
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      drain(futureValue) {
-        if (futureValue === void 0)
-          futureValue = null;
-        return this.listen(null, {cancelOnError: true}).asFuture(futureValue);
-      }
-      take(count) {
-        return dart.as(new _TakeStream(this, count), Stream$(T));
-      }
-      takeWhile(test) {
-        return dart.as(new _TakeWhileStream(this, test), Stream$(T));
-      }
-      skip(count) {
-        return dart.as(new _SkipStream(this, count), Stream$(T));
-      }
-      skipWhile(test) {
-        return dart.as(new _SkipWhileStream(this, test), Stream$(T));
-      }
-      distinct(equals) {
-        if (equals === void 0)
-          equals = null;
-        return dart.as(new _DistinctStream(this, equals), Stream$(T));
-      }
-      get first() {
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((value) => {
-          _cancelAndValue(subscription, future, value);
-        }, {
-          onError: future[_completeError],
-          onDone: () => {
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          },
-          cancelOnError: true
-        });
-        return future;
-      }
-      get last() {
-        let future = new _Future();
-        let result = null;
-        let foundResult = false;
-        let subscription = null;
-        subscription = this.listen((value) => {
-          foundResult = true;
-          result = value;
-        }, {onError: future[_completeError], onDone: (() => {
-            if (foundResult) {
-              future._complete(result);
-              return;
-            }
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      get single() {
-        let future = new _Future();
-        let result = null;
-        let foundResult = false;
-        let subscription = null;
-        subscription = this.listen((value) => {
-          if (foundResult) {
-            try {
-              throw _internal.IterableElementError.tooMany();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _cancelAndErrorWithReplacement(subscription, future, e, s);
-            }
-
-            return;
-          }
-          foundResult = true;
-          result = value;
-        }, {onError: future[_completeError], onDone: (() => {
-            if (foundResult) {
-              future._complete(result);
-              return;
-            }
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      firstWhere(test, opt$) {
-        let defaultValue = opt$.defaultValue === void 0 ? null : opt$.defaultValue;
-        let future = new _Future();
-        let subscription = null;
-        subscription = this.listen((value) => {
-          _runUserCode(() => test(value), (isMatch) => {
-            if (isMatch) {
-              _cancelAndValue(subscription, future, value);
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            if (defaultValue !== null) {
-              _runUserCode(defaultValue, future[_complete], future[_completeError]);
-              return;
-            }
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      lastWhere(test, opt$) {
-        let defaultValue = opt$.defaultValue === void 0 ? null : opt$.defaultValue;
-        let future = new _Future();
-        let result = null;
-        let foundResult = false;
-        let subscription = null;
-        subscription = this.listen((value) => {
-          _runUserCode(() => true === test(value), (isMatch) => {
-            if (isMatch) {
-              foundResult = true;
-              result = value;
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            if (foundResult) {
-              future._complete(result);
-              return;
-            }
-            if (defaultValue !== null) {
-              _runUserCode(defaultValue, future[_complete], future[_completeError]);
-              return;
-            }
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      singleWhere(test) {
-        let future = new _Future();
-        let result = null;
-        let foundResult = false;
-        let subscription = null;
-        subscription = this.listen((value) => {
-          _runUserCode(() => true === test(value), (isMatch) => {
-            if (isMatch) {
-              if (foundResult) {
-                try {
-                  throw _internal.IterableElementError.tooMany();
-                } catch (e) {
-                  let s = dart.stackTrace(e);
-                  _cancelAndErrorWithReplacement(subscription, future, e, s);
-                }
-
-                return;
-              }
-              foundResult = true;
-              result = value;
-            }
-          }, dart.as(_cancelAndErrorClosure(subscription, future), dart.throw_("Unimplemented type (dynamic, StackTrace) → dynamic")));
-        }, {onError: future[_completeError], onDone: (() => {
-            if (foundResult) {
-              future._complete(result);
-              return;
-            }
-            try {
-              throw _internal.IterableElementError.noElement();
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              _completeWithErrorCallback(future, e, s);
-            }
-
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      elementAt(index) {
-        if (dart.notNull(!(typeof index == number)) || dart.notNull(index) < 0)
-          throw new core.ArgumentError(index);
-        let future = new _Future();
-        let subscription = null;
-        let elementIndex = 0;
-        subscription = this.listen((value) => {
-          if (index === elementIndex) {
-            _cancelAndValue(subscription, future, value);
-            return;
-          }
-          elementIndex = 1;
-        }, {onError: future[_completeError], onDone: (() => {
-            future._completeError(new core.RangeError.index(index, this, "index", null, elementIndex));
-          }).bind(this), cancelOnError: true});
-        return future;
-      }
-      timeout(timeLimit, opt$) {
-        let onTimeout = opt$.onTimeout === void 0 ? null : opt$.onTimeout;
-        let controller = null;
-        let subscription = null;
-        let timer = null;
-        let zone = null;
-        let timeout = null;
-        // Function onData: (T) → void
-        function onData(event) {
-          timer.cancel();
-          controller.add(event);
-          timer = zone.createTimer(timeLimit, dart.as(timeout, dart.throw_("Unimplemented type () → void")));
-        }
-        // Function onError: (dynamic, StackTrace) → void
-        function onError(error, stackTrace) {
-          timer.cancel();
-          dart.assert(dart.notNull(dart.is(controller, _StreamController)) || dart.notNull(dart.is(controller, _BroadcastStreamController)));
-          let eventSink = controller;
-          dart.dinvoke(eventSink, '_addError', error, stackTrace);
-          timer = zone.createTimer(timeLimit, dart.as(timeout, dart.throw_("Unimplemented type () → void")));
-        }
-        // Function onDone: () → void
-        function onDone() {
-          timer.cancel();
-          controller.close();
-        }
-        // Function onListen: () → void
-        function onListen() {
-          zone = Zone.current;
-          if (onTimeout === null) {
-            timeout = (() => {
-              controller.addError(new TimeoutException("No stream event", timeLimit), null);
-            }).bind(this);
-          } else {
-            onTimeout = dart.closureWrap(zone.registerUnaryCallback(onTimeout), "(EventSink<dynamic>) → void");
-            let wrapper = new _ControllerEventSinkWrapper(null);
-            timeout = (() => {
-              wrapper[_sink] = controller;
-              zone.runUnaryGuarded(onTimeout, wrapper);
-              wrapper[_sink] = null;
-            }).bind(this);
-          }
-          subscription = this.listen(onData, {onError: onError, onDone: onDone});
-          timer = zone.createTimer(timeLimit, dart.as(timeout, dart.throw_("Unimplemented type () → void")));
-        }
-        // Function onCancel: () → Future<dynamic>
-        function onCancel() {
-          timer.cancel();
-          let result = subscription.cancel();
-          subscription = null;
-          return result;
-        }
-        controller = this.isBroadcast ? new _SyncBroadcastStreamController(onListen, onCancel) : new _SyncStreamController(onListen, (() => {
-          timer.cancel();
-          subscription.pause();
-        }).bind(this), (() => {
-          subscription.resume();
-          timer = zone.createTimer(timeLimit, dart.as(timeout, dart.throw_("Unimplemented type () → void")));
-        }).bind(this), onCancel);
-        return controller.stream;
-      }
-    }
-    dart.defineNamedConstructor(Stream, 'fromFuture');
-    dart.defineNamedConstructor(Stream, 'fromIterable');
-    dart.defineNamedConstructor(Stream, 'periodic');
-    dart.defineNamedConstructor(Stream, 'eventTransformed');
-    return Stream;
-  });
-  let Stream = Stream$(dart.dynamic);
-  let _StreamImpl$ = dart.generic(function(T) {
-    class _StreamImpl extends Stream$(T) {
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        cancelOnError = core.identical(true, cancelOnError);
-        let subscription = this[_createSubscription](onData, onError, onDone, cancelOnError);
-        this[_onListen](subscription);
-        return dart.as(subscription, StreamSubscription$(T));
-      }
-      [_createSubscription](onData, onError, onDone, cancelOnError) {
-        return new _BufferingStreamSubscription(onData, onError, onDone, cancelOnError);
-      }
-      [_onListen](subscription) {}
-    }
-    return _StreamImpl;
-  });
-  let _StreamImpl = _StreamImpl$(dart.dynamic);
-  let _ControllerStream$ = dart.generic(function(T) {
-    class _ControllerStream extends _StreamImpl$(T) {
-      _ControllerStream($_controller) {
-        this[_controller] = $_controller;
-        super._StreamImpl();
-      }
-      [_createSubscription](onData, onError, onDone, cancelOnError) {
-        return this[_controller]._subscribe(onData, onError, onDone, cancelOnError);
-      }
-      get hashCode() {
-        return dart.notNull(this[_controller].hashCode) ^ 892482866;
-      }
-      ['=='](other) {
-        if (core.identical(this, other))
-          return true;
-        if (!dart.is(other, _ControllerStream))
-          return false;
-        let otherStream = dart.as(other, _ControllerStream);
-        return core.identical(otherStream[_controller], this[_controller]);
-      }
-    }
-    return _ControllerStream;
-  });
-  let _ControllerStream = _ControllerStream$(dart.dynamic);
-  let _BroadcastStream$ = dart.generic(function(T) {
-    class _BroadcastStream extends _ControllerStream$(T) {
-      _BroadcastStream(controller) {
-        super._ControllerStream(dart.as(controller, _StreamControllerLifecycle$(T)));
-      }
-      get isBroadcast() {
-        return true;
-      }
-    }
-    return _BroadcastStream;
-  });
-  let _BroadcastStream = _BroadcastStream$(dart.dynamic);
-  let _next = Symbol('_next');
-  let _previous = Symbol('_previous');
-  class _BroadcastSubscriptionLink extends core.Object {
-    _BroadcastSubscriptionLink() {
-      this[_next] = null;
-      this[_previous] = null;
-    }
-  }
-  let _eventState = Symbol('_eventState');
-  let _expectsEvent = Symbol('_expectsEvent');
-  let _toggleEventId = Symbol('_toggleEventId');
-  let _isFiring = Symbol('_isFiring');
-  let _setRemoveAfterFiring = Symbol('_setRemoveAfterFiring');
-  let _removeAfterFiring = Symbol('_removeAfterFiring');
-  let _onPause = Symbol('_onPause');
-  let _onResume = Symbol('_onResume');
-  let _onCancel = Symbol('_onCancel');
-  let _zone = Symbol('_zone');
-  let _state = Symbol('_state');
-  let _onData = Symbol('_onData');
-  let _onError = Symbol('_onError');
-  let _onDone = Symbol('_onDone');
-  let _cancelFuture = Symbol('_cancelFuture');
-  let _pending = Symbol('_pending');
-  let _setPendingEvents = Symbol('_setPendingEvents');
-  let _extractPending = Symbol('_extractPending');
-  let _isCanceled = Symbol('_isCanceled');
-  let _isPaused = Symbol('_isPaused');
-  let _isInputPaused = Symbol('_isInputPaused');
-  let _inCallback = Symbol('_inCallback');
-  let _guardCallback = Symbol('_guardCallback');
-  let _decrementPauseCount = Symbol('_decrementPauseCount');
-  let _hasPending = Symbol('_hasPending');
-  let _mayResumeInput = Symbol('_mayResumeInput');
-  let _cancel = Symbol('_cancel');
-  let _isClosed = Symbol('_isClosed');
-  let _waitsForCancel = Symbol('_waitsForCancel');
-  let _canFire = Symbol('_canFire');
-  let _cancelOnError = Symbol('_cancelOnError');
-  let _incrementPauseCount = Symbol('_incrementPauseCount');
-  let _add = Symbol('_add');
-  let _sendData = Symbol('_sendData');
-  let _addPending = Symbol('_addPending');
-  let _sendError = Symbol('_sendError');
-  let _close = Symbol('_close');
-  let _sendDone = Symbol('_sendDone');
-  let _checkState = Symbol('_checkState');
-  let _BufferingStreamSubscription$ = dart.generic(function(T) {
-    class _BufferingStreamSubscription extends core.Object {
-      _BufferingStreamSubscription(onData, onError, onDone, cancelOnError) {
-        this[_zone] = Zone.current;
-        this[_state] = cancelOnError ? _BufferingStreamSubscription._STATE_CANCEL_ON_ERROR : 0;
-        this[_onData] = null;
-        this[_onError] = null;
-        this[_onDone] = null;
-        this[_cancelFuture] = null;
-        this[_pending] = null;
-        this.onData(onData);
-        this.onError(onError);
-        this.onDone(onDone);
-      }
-      [_setPendingEvents](pendingEvents) {
-        dart.assert(this[_pending] === null);
-        if (pendingEvents === null)
-          return;
-        this[_pending] = pendingEvents;
-        if (!dart.notNull(pendingEvents.isEmpty)) {
-          this[_state] = _BufferingStreamSubscription._STATE_HAS_PENDING;
-          this[_pending].schedule(this);
-        }
-      }
-      [_extractPending]() {
-        dart.assert(this[_isCanceled]);
-        let events = this[_pending];
-        this[_pending] = null;
-        return events;
-      }
-      onData(handleData) {
-        if (handleData === null)
-          handleData = dart.closureWrap(_nullDataHandler, "(T) → void");
-        this[_onData] = dart.closureWrap(this[_zone].registerUnaryCallback(handleData), "(T) → void");
-      }
-      onError(handleError) {
-        if (handleError === null)
-          handleError = _nullErrorHandler;
-        this[_onError] = _registerErrorHandler(handleError, this[_zone]);
-      }
-      onDone(handleDone) {
-        if (handleDone === null)
-          handleDone = _nullDoneHandler;
-        this[_onDone] = this[_zone].registerCallback(handleDone);
-      }
-      pause(resumeSignal) {
-        if (resumeSignal === void 0)
-          resumeSignal = null;
-        if (this[_isCanceled])
-          return;
-        let wasPaused = this[_isPaused];
-        let wasInputPaused = this[_isInputPaused];
-        this[_state] = dart.notNull(this[_state]) + dart.notNull(_BufferingStreamSubscription._STATE_PAUSE_COUNT) | dart.notNull(_BufferingStreamSubscription._STATE_INPUT_PAUSED);
-        if (resumeSignal !== null)
-          resumeSignal.whenComplete(this.resume);
-        if (!dart.notNull(wasPaused) && dart.notNull(this[_pending] !== null))
-          this[_pending].cancelSchedule();
-        if (!dart.notNull(wasInputPaused) && !dart.notNull(this[_inCallback]))
-          this[_guardCallback](this[_onPause]);
-      }
-      resume() {
-        if (this[_isCanceled])
-          return;
-        if (this[_isPaused]) {
-          this[_decrementPauseCount]();
-          if (!dart.notNull(this[_isPaused])) {
-            if (dart.notNull(this[_hasPending]) && !dart.notNull(this[_pending].isEmpty)) {
-              this[_pending].schedule(this);
-            } else {
-              dart.assert(this[_mayResumeInput]);
-              this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_INPUT_PAUSED);
-              if (!dart.notNull(this[_inCallback]))
-                this[_guardCallback](this[_onResume]);
-            }
-          }
-        }
-      }
-      cancel() {
-        this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_WAIT_FOR_CANCEL);
-        if (this[_isCanceled])
-          return this[_cancelFuture];
-        this[_cancel]();
-        return this[_cancelFuture];
-      }
-      asFuture(futureValue) {
-        if (futureValue === void 0)
-          futureValue = null;
-        let result = new _Future();
-        this[_onDone] = (() => {
-          result._complete(futureValue);
-        }).bind(this);
-        this[_onError] = ((error, stackTrace) => {
-          this.cancel();
-          result._completeError(error, dart.as(stackTrace, core.StackTrace));
-        }).bind(this);
-        return result;
-      }
-      get [_isInputPaused]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_INPUT_PAUSED)) !== 0;
-      }
-      get [_isClosed]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_CLOSED)) !== 0;
-      }
-      get [_isCanceled]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_CANCELED)) !== 0;
-      }
-      get [_waitsForCancel]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_WAIT_FOR_CANCEL)) !== 0;
-      }
-      get [_inCallback]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK)) !== 0;
-      }
-      get [_hasPending]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_HAS_PENDING)) !== 0;
-      }
-      get [_isPaused]() {
-        return dart.notNull(this[_state]) >= dart.notNull(_BufferingStreamSubscription._STATE_PAUSE_COUNT);
-      }
-      get [_canFire]() {
-        return dart.notNull(this[_state]) < dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-      }
-      get [_mayResumeInput]() {
-        return !dart.notNull(this[_isPaused]) && (dart.notNull(this[_pending] === null) || dart.notNull(this[_pending].isEmpty));
-      }
-      get [_cancelOnError]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BufferingStreamSubscription._STATE_CANCEL_ON_ERROR)) !== 0;
-      }
-      get isPaused() {
-        return this[_isPaused];
-      }
-      [_cancel]() {
-        this[_state] = _BufferingStreamSubscription._STATE_CANCELED;
-        if (this[_hasPending]) {
-          this[_pending].cancelSchedule();
-        }
-        if (!dart.notNull(this[_inCallback]))
-          this[_pending] = null;
-        this[_cancelFuture] = this[_onCancel]();
-      }
-      [_incrementPauseCount]() {
-        this[_state] = dart.notNull(this[_state]) + dart.notNull(_BufferingStreamSubscription._STATE_PAUSE_COUNT) | dart.notNull(_BufferingStreamSubscription._STATE_INPUT_PAUSED);
-      }
-      [_decrementPauseCount]() {
-        dart.assert(this[_isPaused]);
-        this[_state] = _BufferingStreamSubscription._STATE_PAUSE_COUNT;
-      }
-      [_add](data) {
-        dart.assert(!dart.notNull(this[_isClosed]));
-        if (this[_isCanceled])
-          return;
-        if (this[_canFire]) {
-          this[_sendData](data);
-        } else {
-          this[_addPending](new _DelayedData(data));
-        }
-      }
-      [_addError](error, stackTrace) {
-        if (this[_isCanceled])
-          return;
-        if (this[_canFire]) {
-          this[_sendError](error, stackTrace);
-        } else {
-          this[_addPending](new _DelayedError(error, stackTrace));
-        }
-      }
-      [_close]() {
-        dart.assert(!dart.notNull(this[_isClosed]));
-        if (this[_isCanceled])
-          return;
-        this[_state] = _BufferingStreamSubscription._STATE_CLOSED;
-        if (this[_canFire]) {
-          this[_sendDone]();
-        } else {
-          this[_addPending](new _DelayedDone());
-        }
-      }
-      [_onPause]() {
-        dart.assert(this[_isInputPaused]);
-      }
-      [_onResume]() {
-        dart.assert(!dart.notNull(this[_isInputPaused]));
-      }
-      [_onCancel]() {
-        dart.assert(this[_isCanceled]);
-        return null;
-      }
-      [_addPending](event) {
-        let pending = dart.as(this[_pending], _StreamImplEvents);
-        if (this[_pending] === null)
-          pending = this[_pending] = new _StreamImplEvents();
-        pending.add(event);
-        if (!dart.notNull(this[_hasPending])) {
-          this[_state] = _BufferingStreamSubscription._STATE_HAS_PENDING;
-          if (!dart.notNull(this[_isPaused])) {
-            this[_pending].schedule(this);
-          }
-        }
-      }
-      [_sendData](data) {
-        dart.assert(!dart.notNull(this[_isCanceled]));
-        dart.assert(!dart.notNull(this[_isPaused]));
-        dart.assert(!dart.notNull(this[_inCallback]));
-        let wasInputPaused = this[_isInputPaused];
-        this[_state] = _BufferingStreamSubscription._STATE_IN_CALLBACK;
-        this[_zone].runUnaryGuarded(this[_onData], data);
-        this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-        this[_checkState](wasInputPaused);
-      }
-      [_sendError](error, stackTrace) {
-        dart.assert(!dart.notNull(this[_isCanceled]));
-        dart.assert(!dart.notNull(this[_isPaused]));
-        dart.assert(!dart.notNull(this[_inCallback]));
-        let wasInputPaused = this[_isInputPaused];
-        // Function sendError: () → void
-        function sendError() {
-          if (dart.notNull(this[_isCanceled]) && !dart.notNull(this[_waitsForCancel]))
-            return;
-          this[_state] = _BufferingStreamSubscription._STATE_IN_CALLBACK;
-          if (dart.is(this[_onError], ZoneBinaryCallback)) {
-            this[_zone].runBinaryGuarded(dart.as(this[_onError], dart.throw_("Unimplemented type (dynamic, dynamic) → dynamic")), error, stackTrace);
-          } else {
-            this[_zone].runUnaryGuarded(dart.as(this[_onError], dart.throw_("Unimplemented type (dynamic) → dynamic")), error);
-          }
-          this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-        }
-        if (this[_cancelOnError]) {
-          this[_state] = _BufferingStreamSubscription._STATE_WAIT_FOR_CANCEL;
-          this[_cancel]();
-          if (dart.is(this[_cancelFuture], Future)) {
-            this[_cancelFuture].whenComplete(sendError);
-          } else {
-            sendError();
-          }
-        } else {
-          sendError();
-          this[_checkState](wasInputPaused);
-        }
-      }
-      [_sendDone]() {
-        dart.assert(!dart.notNull(this[_isCanceled]));
-        dart.assert(!dart.notNull(this[_isPaused]));
-        dart.assert(!dart.notNull(this[_inCallback]));
-        // Function sendDone: () → void
-        function sendDone() {
-          if (!dart.notNull(this[_waitsForCancel]))
-            return;
-          this[_state] = dart.notNull(_BufferingStreamSubscription._STATE_CANCELED) | dart.notNull(_BufferingStreamSubscription._STATE_CLOSED) | dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-          this[_zone].runGuarded(this[_onDone]);
-          this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-        }
-        this[_cancel]();
-        this[_state] = _BufferingStreamSubscription._STATE_WAIT_FOR_CANCEL;
-        if (dart.is(this[_cancelFuture], Future)) {
-          this[_cancelFuture].whenComplete(sendDone);
-        } else {
-          sendDone();
-        }
-      }
-      [_guardCallback](callback) {
-        dart.assert(!dart.notNull(this[_inCallback]));
-        let wasInputPaused = this[_isInputPaused];
-        this[_state] = _BufferingStreamSubscription._STATE_IN_CALLBACK;
-        dart.dinvokef(callback);
-        this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-        this[_checkState](wasInputPaused);
-      }
-      [_checkState](wasInputPaused) {
-        dart.assert(!dart.notNull(this[_inCallback]));
-        if (dart.notNull(this[_hasPending]) && dart.notNull(this[_pending].isEmpty)) {
-          this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_HAS_PENDING);
-          if (dart.notNull(this[_isInputPaused]) && dart.notNull(this[_mayResumeInput])) {
-            this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_INPUT_PAUSED);
-          }
-        }
-        while (true) {
-          if (this[_isCanceled]) {
-            this[_pending] = null;
-            return;
-          }
-          let isInputPaused = this[_isInputPaused];
-          if (wasInputPaused === isInputPaused)
-            break;
-          this[_state] = _BufferingStreamSubscription._STATE_IN_CALLBACK;
-          if (isInputPaused) {
-            this[_onPause]();
-          } else {
-            this[_onResume]();
-          }
-          this[_state] = ~dart.notNull(_BufferingStreamSubscription._STATE_IN_CALLBACK);
-          wasInputPaused = isInputPaused;
-        }
-        if (dart.notNull(this[_hasPending]) && !dart.notNull(this[_isPaused])) {
-          this[_pending].schedule(this);
-        }
-      }
-    }
-    _BufferingStreamSubscription._STATE_CANCEL_ON_ERROR = 1;
-    _BufferingStreamSubscription._STATE_CLOSED = 2;
-    _BufferingStreamSubscription._STATE_INPUT_PAUSED = 4;
-    _BufferingStreamSubscription._STATE_CANCELED = 8;
-    _BufferingStreamSubscription._STATE_WAIT_FOR_CANCEL = 16;
-    _BufferingStreamSubscription._STATE_IN_CALLBACK = 32;
-    _BufferingStreamSubscription._STATE_HAS_PENDING = 64;
-    _BufferingStreamSubscription._STATE_PAUSE_COUNT = 128;
-    _BufferingStreamSubscription._STATE_PAUSE_COUNT_SHIFT = 7;
-    return _BufferingStreamSubscription;
-  });
-  let _BufferingStreamSubscription = _BufferingStreamSubscription$(dart.dynamic);
-  let _ControllerSubscription$ = dart.generic(function(T) {
-    class _ControllerSubscription extends _BufferingStreamSubscription$(T) {
-      _ControllerSubscription($_controller, onData, onError, onDone, cancelOnError) {
-        this[_controller] = $_controller;
-        super._BufferingStreamSubscription(onData, onError, onDone, cancelOnError);
-      }
-      [_onCancel]() {
-        return this[_controller]._recordCancel(this);
-      }
-      [_onPause]() {
-        this[_controller]._recordPause(this);
-      }
-      [_onResume]() {
-        this[_controller]._recordResume(this);
-      }
-    }
-    return _ControllerSubscription;
-  });
-  let _ControllerSubscription = _ControllerSubscription$(dart.dynamic);
-  let _BroadcastSubscription$ = dart.generic(function(T) {
-    class _BroadcastSubscription extends _ControllerSubscription$(T) {
-      _BroadcastSubscription(controller, onData, onError, onDone, cancelOnError) {
-        this[_eventState] = null;
-        this[_next] = null;
-        this[_previous] = null;
-        super._ControllerSubscription(dart.as(controller, _StreamControllerLifecycle$(T)), onData, onError, onDone, cancelOnError);
-        this[_next] = this[_previous] = this;
-      }
-      get [_controller]() {
-        return dart.as(super[_controller], _BroadcastStreamController);
-      }
-      [_expectsEvent](eventId) {
-        return (dart.notNull(this[_eventState]) & dart.notNull(_BroadcastSubscription._STATE_EVENT_ID)) === eventId;
-      }
-      [_toggleEventId]() {
-        this[_eventState] = _BroadcastSubscription._STATE_EVENT_ID;
-      }
-      get [_isFiring]() {
-        return (dart.notNull(this[_eventState]) & dart.notNull(_BroadcastSubscription._STATE_FIRING)) !== 0;
-      }
-      [_setRemoveAfterFiring]() {
-        dart.assert(this[_isFiring]);
-        this[_eventState] = _BroadcastSubscription._STATE_REMOVE_AFTER_FIRING;
-      }
-      get [_removeAfterFiring]() {
-        return (dart.notNull(this[_eventState]) & dart.notNull(_BroadcastSubscription._STATE_REMOVE_AFTER_FIRING)) !== 0;
-      }
-      [_onPause]() {}
-      [_onResume]() {}
-    }
-    _BroadcastSubscription._STATE_EVENT_ID = 1;
-    _BroadcastSubscription._STATE_FIRING = 2;
-    _BroadcastSubscription._STATE_REMOVE_AFTER_FIRING = 4;
-    return _BroadcastSubscription;
-  });
-  let _BroadcastSubscription = _BroadcastSubscription$(dart.dynamic);
-  let _addStreamState = Symbol('_addStreamState');
-  let _doneFuture = Symbol('_doneFuture');
-  let _isEmpty = Symbol('_isEmpty');
-  let _hasOneListener = Symbol('_hasOneListener');
-  let _isAddingStream = Symbol('_isAddingStream');
-  let _mayAddEvent = Symbol('_mayAddEvent');
-  let _ensureDoneFuture = Symbol('_ensureDoneFuture');
-  let _addListener = Symbol('_addListener');
-  let _removeListener = Symbol('_removeListener');
-  let _subscribe = Symbol('_subscribe');
-  let _recordCancel = Symbol('_recordCancel');
-  let _callOnCancel = Symbol('_callOnCancel');
-  let _recordPause = Symbol('_recordPause');
-  let _recordResume = Symbol('_recordResume');
-  let _addEventError = Symbol('_addEventError');
-  let _forEachListener = Symbol('_forEachListener');
-  let _STATE_FIRING = Symbol('_STATE_FIRING');
-  let _mayComplete = Symbol('_mayComplete');
-  let _BroadcastStreamController$ = dart.generic(function(T) {
-    class _BroadcastStreamController extends core.Object {
-      _BroadcastStreamController($_onListen, $_onCancel) {
-        this[_onListen] = $_onListen;
-        this[_onCancel] = $_onCancel;
-        this[_state] = _BroadcastStreamController._STATE_INITIAL;
-        this[_next] = null;
-        this[_previous] = null;
-        this[_addStreamState] = null;
-        this[_doneFuture] = null;
-        this[_next] = this[_previous] = this;
-      }
-      get stream() {
-        return new _BroadcastStream(this);
-      }
-      get sink() {
-        return new _StreamSinkWrapper(this);
-      }
-      get isClosed() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BroadcastStreamController._STATE_CLOSED)) !== 0;
-      }
-      get isPaused() {
-        return false;
-      }
-      get hasListener() {
-        return !dart.notNull(this[_isEmpty]);
-      }
-      get [_hasOneListener]() {
-        dart.assert(!dart.notNull(this[_isEmpty]));
-        return core.identical(this[_next][_next], this);
-      }
-      get [_isFiring]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BroadcastStreamController._STATE_FIRING)) !== 0;
-      }
-      get [_isAddingStream]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_BroadcastStreamController._STATE_ADDSTREAM)) !== 0;
-      }
-      get [_mayAddEvent]() {
-        return dart.notNull(this[_state]) < dart.notNull(_BroadcastStreamController._STATE_CLOSED);
-      }
-      [_ensureDoneFuture]() {
-        if (this[_doneFuture] !== null)
-          return this[_doneFuture];
-        return this[_doneFuture] = new _Future();
-      }
-      get [_isEmpty]() {
-        return core.identical(this[_next], this);
-      }
-      [_addListener](subscription) {
-        dart.assert(core.identical(subscription[_next], subscription));
-        subscription[_previous] = this[_previous];
-        subscription[_next] = this;
-        this[_previous][_next] = subscription;
-        this[_previous] = subscription;
-        subscription[_eventState] = dart.notNull(this[_state]) & dart.notNull(_BroadcastStreamController._STATE_EVENT_ID);
-      }
-      [_removeListener](subscription) {
-        dart.assert(core.identical(subscription[_controller], this));
-        dart.assert(!dart.notNull(core.identical(subscription[_next], subscription)));
-        let previous = subscription[_previous];
-        let next = subscription[_next];
-        previous[_next] = next;
-        next[_previous] = previous;
-        subscription[_next] = subscription[_previous] = subscription;
-      }
-      [_subscribe](onData, onError, onDone, cancelOnError) {
-        if (this.isClosed) {
-          if (onDone === null)
-            onDone = _nullDoneHandler;
-          return new _DoneStreamSubscription(onDone);
-        }
-        let subscription = new _BroadcastSubscription(this, onData, onError, onDone, cancelOnError);
-        this[_addListener](dart.as(subscription, _BroadcastSubscription$(T)));
-        if (core.identical(this[_next], this[_previous])) {
-          _runGuarded(this[_onListen]);
-        }
-        return dart.as(subscription, StreamSubscription$(T));
-      }
-      [_recordCancel](subscription) {
-        if (core.identical(subscription[_next], subscription))
-          return null;
-        dart.assert(!dart.notNull(core.identical(subscription[_next], subscription)));
-        if (subscription[_isFiring]) {
-          subscription._setRemoveAfterFiring();
-        } else {
-          dart.assert(!dart.notNull(core.identical(subscription[_next], subscription)));
-          this[_removeListener](subscription);
-          if (!dart.notNull(this[_isFiring]) && dart.notNull(this[_isEmpty])) {
-            this[_callOnCancel]();
-          }
-        }
-        return null;
-      }
-      [_recordPause](subscription) {}
-      [_recordResume](subscription) {}
-      [_addEventError]() {
-        if (this.isClosed) {
-          return new core.StateError("Cannot add new events after calling close");
-        }
-        dart.assert(this[_isAddingStream]);
-        return new core.StateError("Cannot add new events while doing an addStream");
-      }
-      add(data) {
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_addEventError]();
-        this[_sendData](data);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        error = _nonNullError(error);
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_addEventError]();
-        let replacement = Zone.current.errorCallback(error, stackTrace);
-        if (replacement !== null) {
-          error = _nonNullError(replacement.error);
-          stackTrace = replacement.stackTrace;
-        }
-        this[_sendError](error, stackTrace);
-      }
-      close() {
-        if (this.isClosed) {
-          dart.assert(this[_doneFuture] !== null);
-          return this[_doneFuture];
-        }
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_addEventError]();
-        this[_state] = _BroadcastStreamController._STATE_CLOSED;
-        let doneFuture = this[_ensureDoneFuture]();
-        this[_sendDone]();
-        return doneFuture;
-      }
-      get done() {
-        return this[_ensureDoneFuture]();
-      }
-      addStream(stream, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_addEventError]();
-        this[_state] = _BroadcastStreamController._STATE_ADDSTREAM;
-        this[_addStreamState] = dart.as(new _AddStreamState(this, stream, cancelOnError), _AddStreamState$(T));
-        return this[_addStreamState].addStreamFuture;
-      }
-      [_add](data) {
-        this[_sendData](data);
-      }
-      [_addError](error, stackTrace) {
-        this[_sendError](error, stackTrace);
-      }
-      [_close]() {
-        dart.assert(this[_isAddingStream]);
-        let addState = this[_addStreamState];
-        this[_addStreamState] = null;
-        this[_state] = ~dart.notNull(_BroadcastStreamController._STATE_ADDSTREAM);
-        addState.complete();
-      }
-      [_forEachListener](action) {
-        if (this[_isFiring]) {
-          throw new core.StateError("Cannot fire new event. Controller is already firing an event");
-        }
-        if (this[_isEmpty])
-          return;
-        let id = dart.notNull(this[_state]) & dart.notNull(_BroadcastStreamController._STATE_EVENT_ID);
-        this[_state] = dart.notNull(_BroadcastStreamController._STATE_EVENT_ID) | dart.notNull(_BroadcastStreamController._STATE_FIRING);
-        let link = this[_next];
-        while (!dart.notNull(core.identical(link, this))) {
-          let subscription = dart.as(link, _BroadcastSubscription$(T));
-          if (subscription._expectsEvent(id)) {
-            subscription[_eventState] = _BroadcastSubscription[_STATE_FIRING];
-            action(subscription);
-            subscription._toggleEventId();
-            link = subscription[_next];
-            if (subscription[_removeAfterFiring]) {
-              this[_removeListener](subscription);
-            }
-            subscription[_eventState] = ~dart.notNull(_BroadcastSubscription[_STATE_FIRING]);
-          } else {
-            link = subscription[_next];
-          }
-        }
-        this[_state] = ~dart.notNull(_BroadcastStreamController._STATE_FIRING);
-        if (this[_isEmpty]) {
-          this[_callOnCancel]();
-        }
-      }
-      [_callOnCancel]() {
-        dart.assert(this[_isEmpty]);
-        if (dart.notNull(this.isClosed) && dart.notNull(this[_doneFuture][_mayComplete])) {
-          this[_doneFuture]._asyncComplete(null);
-        }
-        _runGuarded(this[_onCancel]);
-      }
-    }
-    _BroadcastStreamController._STATE_INITIAL = 0;
-    _BroadcastStreamController._STATE_EVENT_ID = 1;
-    _BroadcastStreamController._STATE_FIRING = 2;
-    _BroadcastStreamController._STATE_CLOSED = 4;
-    _BroadcastStreamController._STATE_ADDSTREAM = 8;
-    return _BroadcastStreamController;
-  });
-  let _BroadcastStreamController = _BroadcastStreamController$(dart.dynamic);
-  let _SyncBroadcastStreamController$ = dart.generic(function(T) {
-    class _SyncBroadcastStreamController extends _BroadcastStreamController$(T) {
-      _SyncBroadcastStreamController(onListen, onCancel) {
-        super._BroadcastStreamController(onListen, onCancel);
-      }
-      [_sendData](data) {
-        if (this[_isEmpty])
-          return;
-        if (this[_hasOneListener]) {
-          this[_state] = _BroadcastStreamController[_STATE_FIRING];
-          let subscription = dart.as(this[_next], _BroadcastSubscription);
-          subscription._add(data);
-          this[_state] = ~dart.notNull(_BroadcastStreamController[_STATE_FIRING]);
-          if (this[_isEmpty]) {
-            this[_callOnCancel]();
-          }
-          return;
-        }
-        this[_forEachListener](((subscription) => {
-          subscription._add(data);
-        }).bind(this));
-      }
-      [_sendError](error, stackTrace) {
-        if (this[_isEmpty])
-          return;
-        this[_forEachListener](((subscription) => {
-          subscription._addError(error, stackTrace);
-        }).bind(this));
-      }
-      [_sendDone]() {
-        if (!dart.notNull(this[_isEmpty])) {
-          this[_forEachListener](dart.closureWrap(((subscription) => {
-            subscription._close();
-          }).bind(this), "(_BufferingStreamSubscription<T>) → void"));
-        } else {
-          dart.assert(this[_doneFuture] !== null);
-          dart.assert(this[_doneFuture][_mayComplete]);
-          this[_doneFuture]._asyncComplete(null);
-        }
-      }
-    }
-    return _SyncBroadcastStreamController;
-  });
-  let _SyncBroadcastStreamController = _SyncBroadcastStreamController$(dart.dynamic);
-  let _AsyncBroadcastStreamController$ = dart.generic(function(T) {
-    class _AsyncBroadcastStreamController extends _BroadcastStreamController$(T) {
-      _AsyncBroadcastStreamController(onListen, onCancel) {
-        super._BroadcastStreamController(onListen, onCancel);
-      }
-      [_sendData](data) {
-        for (let link = this[_next]; !dart.notNull(core.identical(link, this)); link = link[_next]) {
-          let subscription = dart.as(link, _BroadcastSubscription$(T));
-          subscription._addPending(new _DelayedData(data));
-        }
-      }
-      [_sendError](error, stackTrace) {
-        for (let link = this[_next]; !dart.notNull(core.identical(link, this)); link = link[_next]) {
-          let subscription = dart.as(link, _BroadcastSubscription$(T));
-          subscription._addPending(new _DelayedError(error, stackTrace));
-        }
-      }
-      [_sendDone]() {
-        if (!dart.notNull(this[_isEmpty])) {
-          for (let link = this[_next]; !dart.notNull(core.identical(link, this)); link = link[_next]) {
-            let subscription = dart.as(link, _BroadcastSubscription$(T));
-            subscription._addPending(new _DelayedDone());
-          }
-        } else {
-          dart.assert(this[_doneFuture] !== null);
-          dart.assert(this[_doneFuture][_mayComplete]);
-          this[_doneFuture]._asyncComplete(null);
-        }
-      }
-    }
-    return _AsyncBroadcastStreamController;
-  });
-  let _AsyncBroadcastStreamController = _AsyncBroadcastStreamController$(dart.dynamic);
-  let _addPendingEvent = Symbol('_addPendingEvent');
-  let _STATE_CLOSED = Symbol('_STATE_CLOSED');
-  let _AsBroadcastStreamController$ = dart.generic(function(T) {
-    class _AsBroadcastStreamController extends _SyncBroadcastStreamController$(T) {
-      _AsBroadcastStreamController(onListen, onCancel) {
-        this[_pending] = null;
-        super._SyncBroadcastStreamController(onListen, onCancel);
-      }
-      get [_hasPending]() {
-        return dart.notNull(this[_pending] !== null) && !dart.notNull(this[_pending].isEmpty);
-      }
-      [_addPendingEvent](event) {
-        if (this[_pending] === null) {
-          this[_pending] = new _StreamImplEvents();
-        }
-        this[_pending].add(event);
-      }
-      add(data) {
-        if (!dart.notNull(this.isClosed) && dart.notNull(this[_isFiring])) {
-          this[_addPendingEvent](new _DelayedData(data));
-          return;
-        }
-        super.add(data);
-        while (this[_hasPending]) {
-          this[_pending].handleNext(this);
-        }
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        if (!dart.notNull(this.isClosed) && dart.notNull(this[_isFiring])) {
-          this[_addPendingEvent](new _DelayedError(error, stackTrace));
-          return;
-        }
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_addEventError]();
-        this[_sendError](error, stackTrace);
-        while (this[_hasPending]) {
-          this[_pending].handleNext(this);
-        }
-      }
-      close() {
-        if (!dart.notNull(this.isClosed) && dart.notNull(this[_isFiring])) {
-          this[_addPendingEvent](new _DelayedDone());
-          this[_state] = _BroadcastStreamController[_STATE_CLOSED];
-          return super.done;
-        }
-        let result = super.close();
-        dart.assert(!dart.notNull(this[_hasPending]));
-        return result;
-      }
-      [_callOnCancel]() {
-        if (this[_hasPending]) {
-          this[_pending].clear();
-          this[_pending] = null;
-        }
-        super._callOnCancel();
-      }
-    }
-    return _AsBroadcastStreamController;
-  });
-  let _AsBroadcastStreamController = _AsBroadcastStreamController$(dart.dynamic);
-  let _pauseCount = Symbol('_pauseCount');
-  let _resume = Symbol('_resume');
-  let _DoneSubscription$ = dart.generic(function(T) {
-    class _DoneSubscription extends core.Object {
-      _DoneSubscription() {
-        this[_pauseCount] = 0;
-      }
-      onData(handleData) {}
-      onError(handleError) {}
-      onDone(handleDone) {}
-      pause(resumeSignal) {
-        if (resumeSignal === void 0)
-          resumeSignal = null;
-        if (resumeSignal !== null)
-          resumeSignal.then(this[_resume]);
-        this[_pauseCount] = dart.notNull(this[_pauseCount]) + 1;
-      }
-      resume() {
-        this[_resume](null);
-      }
-      [_resume](_) {
-        if (dart.notNull(this[_pauseCount]) > 0)
-          this[_pauseCount] = dart.notNull(this[_pauseCount]) - 1;
-      }
-      cancel() {
-        return new _Future.immediate(null);
-      }
-      get isPaused() {
-        return dart.notNull(this[_pauseCount]) > 0;
-      }
-      asFuture(value) {
-        if (value === void 0)
-          value = null;
-        return new _Future();
-      }
-    }
-    return _DoneSubscription;
-  });
-  let _DoneSubscription = _DoneSubscription$(dart.dynamic);
-  class DeferredLibrary extends core.Object {
-    DeferredLibrary(libraryName, opt$) {
-      let uri = opt$.uri === void 0 ? null : opt$.uri;
-      this.libraryName = libraryName;
-      this.uri = uri;
-    }
-    load() {
-      throw 'DeferredLibrary not supported. ' + 'please use the `import "lib.dart" deferred as lib` syntax.';
-    }
-  }
-  let _s = Symbol('_s');
-  class DeferredLoadException extends core.Object {
-    DeferredLoadException($_s) {
-      this[_s] = $_s;
-    }
-    toString() {
-      return `DeferredLoadException: '${this[_s]}'`;
-    }
-  }
-  let Future$ = dart.generic(function(T) {
-    class Future extends core.Object {
-      Future(computation) {
-        let result = new _Future();
-        Timer.run((() => {
-          try {
-            result._complete(computation());
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _completeWithErrorCallback(result, e, s);
-          }
-
-        }).bind(this));
-        return dart.as(result, Future$(T));
-      }
-      Future$microtask(computation) {
-        let result = new _Future();
-        scheduleMicrotask((() => {
-          try {
-            result._complete(computation());
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _completeWithErrorCallback(result, e, s);
-          }
-
-        }).bind(this));
-        return dart.as(result, Future$(T));
-      }
-      Future$sync(computation) {
-        try {
-          let result = computation();
-          return new Future.value(result);
-        } catch (error) {
-          let stackTrace = dart.stackTrace(error);
-          return new Future.error(error, stackTrace);
-        }
-
-      }
-      Future$value(value) {
-        if (value === void 0)
-          value = null;
-        return new _Future.immediate(value);
-      }
-      Future$error(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        error = _nonNullError(error);
-        if (!dart.notNull(core.identical(Zone.current, _ROOT_ZONE))) {
-          let replacement = Zone.current.errorCallback(error, stackTrace);
-          if (replacement !== null) {
-            error = _nonNullError(replacement.error);
-            stackTrace = replacement.stackTrace;
-          }
-        }
-        return new _Future.immediateError(error, stackTrace);
-      }
-      Future$delayed(duration, computation) {
-        if (computation === void 0)
-          computation = null;
-        let result = new _Future();
-        new Timer(duration, (() => {
-          try {
-            result._complete(computation === null ? null : computation());
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _completeWithErrorCallback(result, e, s);
-          }
-
-        }).bind(this));
-        return dart.as(result, Future$(T));
-      }
-      static wait(futures, opt$) {
-        let eagerError = opt$.eagerError === void 0 ? false : opt$.eagerError;
-        let cleanUp = opt$.cleanUp === void 0 ? null : opt$.cleanUp;
-        let result = new _Future();
-        let values = null;
-        let remaining = 0;
-        let error = null;
-        let stackTrace = null;
-        // Function handleError: (dynamic, dynamic) → void
-        function handleError(theError, theStackTrace) {
-          remaining = dart.notNull(remaining) - 1;
-          if (values !== null) {
-            if (cleanUp !== null) {
-              for (let value of values) {
-                if (value !== null) {
-                  new Future.sync(() => {
-                    dart.dinvokef(cleanUp, value);
-                  });
-                }
-              }
-            }
-            values = null;
-            if (remaining === 0 || dart.notNull(eagerError)) {
-              result._completeError(theError, dart.as(theStackTrace, core.StackTrace));
-            } else {
-              error = theError;
-              stackTrace = dart.as(theStackTrace, core.StackTrace);
-            }
-          } else if (remaining === 0 && !dart.notNull(eagerError)) {
-            result._completeError(error, stackTrace);
-          }
-        }
-        for (let future of futures) {
-          let pos = (($tmp) => remaining = dart.notNull($tmp) + 1, $tmp)(remaining);
-          future.then(((value) => {
-            remaining = dart.notNull(remaining) - 1;
-            if (values !== null) {
-              values.set(pos, value);
-              if (remaining === 0) {
-                result._completeWithValue(values);
-              }
-            } else {
-              if (dart.notNull(cleanUp !== null) && dart.notNull(value !== null)) {
-                new Future.sync(() => {
-                  dart.dinvokef(cleanUp, value);
-                });
-              }
-              if (remaining === 0 && !dart.notNull(eagerError)) {
-                result._completeError(error, stackTrace);
-              }
-            }
-          }).bind(this), {onError: handleError});
-        }
-        if (remaining === 0) {
-          return dart.as(new Future.value(/* Unimplemented const */new List.from([])), Future$(core.List));
-        }
-        values = new core.List(remaining);
-        return result;
-      }
-      static forEach(input, f) {
-        let iterator = input.iterator;
-        return doWhile((() => {
-          if (!dart.notNull(iterator.moveNext()))
-            return false;
-          return new Future.sync((() => dart.dinvokef(f, iterator.current)).bind(this)).then((_) => true);
-        }).bind(this));
-      }
-      static doWhile(f) {
-        let doneSignal = new _Future();
-        let nextIteration = null;
-        nextIteration = Zone.current.bindUnaryCallback(((keepGoing) => {
-          if (keepGoing) {
-            new Future.sync(f).then(dart.as(nextIteration, dart.throw_("Unimplemented type (dynamic) → dynamic")), {onError: doneSignal[_completeError]});
-          } else {
-            doneSignal._complete(null);
-          }
-        }).bind(this), {runGuarded: true});
-        dart.dinvokef(nextIteration, true);
-        return doneSignal;
-      }
-    }
-    dart.defineNamedConstructor(Future, 'microtask');
-    dart.defineNamedConstructor(Future, 'sync');
-    dart.defineNamedConstructor(Future, 'value');
-    dart.defineNamedConstructor(Future, 'error');
-    dart.defineNamedConstructor(Future, 'delayed');
-    dart.defineLazyProperties(Future, {
-      get _nullFuture() {
-        return dart.as(new Future.value(null), _Future);
-      }
-    });
-    return Future;
-  });
-  let Future = Future$(dart.dynamic);
-  class TimeoutException extends core.Object {
-    TimeoutException(message, duration) {
-      if (duration === void 0)
-        duration = null;
-      this.message = message;
-      this.duration = duration;
-    }
-    toString() {
-      let result = "TimeoutException";
-      if (this.duration !== null)
-        result = `TimeoutException after ${this.duration}`;
-      if (this.message !== null)
-        result = `${result}: ${this.message}`;
-      return result;
-    }
-  }
-  let Completer$ = dart.generic(function(T) {
-    class Completer extends core.Object {
-      Completer() {
-        return new _AsyncCompleter();
-      }
-      Completer$sync() {
-        return new _SyncCompleter();
-      }
-    }
-    dart.defineNamedConstructor(Completer, 'sync');
-    return Completer;
-  });
-  let Completer = Completer$(dart.dynamic);
-  // Function _completeWithErrorCallback: (_Future<dynamic>, dynamic, dynamic) → void
-  function _completeWithErrorCallback(result, error, stackTrace) {
-    let replacement = Zone.current.errorCallback(error, dart.as(stackTrace, core.StackTrace));
-    if (replacement !== null) {
-      error = _nonNullError(replacement.error);
-      stackTrace = replacement.stackTrace;
-    }
-    result._completeError(error, dart.as(stackTrace, core.StackTrace));
-  }
-  // Function _nonNullError: (Object) → Object
-  function _nonNullError(error) {
-    return error !== null ? error : new core.NullThrownError();
-  }
-  let _Completer$ = dart.generic(function(T) {
-    class _Completer extends core.Object {
-      _Completer() {
-        this.future = new _Future();
-      }
-      completeError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        error = _nonNullError(error);
-        if (!dart.notNull(this.future[_mayComplete]))
-          throw new core.StateError("Future already completed");
-        let replacement = Zone.current.errorCallback(error, stackTrace);
-        if (replacement !== null) {
-          error = _nonNullError(replacement.error);
-          stackTrace = replacement.stackTrace;
-        }
-        this[_completeError](error, stackTrace);
-      }
-      get isCompleted() {
-        return !dart.notNull(this.future[_mayComplete]);
-      }
-    }
-    return _Completer;
-  });
-  let _Completer = _Completer$(dart.dynamic);
-  let _AsyncCompleter$ = dart.generic(function(T) {
-    class _AsyncCompleter extends _Completer$(T) {
-      complete(value) {
-        if (value === void 0)
-          value = null;
-        if (!dart.notNull(this.future[_mayComplete]))
-          throw new core.StateError("Future already completed");
-        this.future._asyncComplete(value);
-      }
-      [_completeError](error, stackTrace) {
-        this.future._asyncCompleteError(error, stackTrace);
-      }
-    }
-    return _AsyncCompleter;
-  });
-  let _AsyncCompleter = _AsyncCompleter$(dart.dynamic);
-  let _SyncCompleter$ = dart.generic(function(T) {
-    class _SyncCompleter extends _Completer$(T) {
-      complete(value) {
-        if (value === void 0)
-          value = null;
-        if (!dart.notNull(this.future[_mayComplete]))
-          throw new core.StateError("Future already completed");
-        this.future._complete(value);
-      }
-      [_completeError](error, stackTrace) {
-        this.future._completeError(error, stackTrace);
-      }
-    }
-    return _SyncCompleter;
-  });
-  let _SyncCompleter = _SyncCompleter$(dart.dynamic);
-  let _nextListener = Symbol('_nextListener');
-  let _onValue = Symbol('_onValue');
-  let _errorTest = Symbol('_errorTest');
-  let _whenCompleteAction = Symbol('_whenCompleteAction');
-  class _FutureListener extends core.Object {
-    _FutureListener$then(result, onValue, errorCallback) {
-      this.result = result;
-      this.callback = onValue;
-      this.errorCallback = errorCallback;
-      this.state = errorCallback === null ? _FutureListener.STATE_THEN : _FutureListener.STATE_THEN_ONERROR;
-      this[_nextListener] = null;
-    }
-    _FutureListener$catchError(result, errorCallback, test) {
-      this.result = result;
-      this.errorCallback = errorCallback;
-      this.callback = test;
-      this.state = test === null ? _FutureListener.STATE_CATCHERROR : _FutureListener.STATE_CATCHERROR_TEST;
-      this[_nextListener] = null;
-    }
-    _FutureListener$whenComplete(result, onComplete) {
-      this.result = result;
-      this.callback = onComplete;
-      this.errorCallback = null;
-      this.state = _FutureListener.STATE_WHENCOMPLETE;
-      this[_nextListener] = null;
-    }
-    _FutureListener$chain(result) {
-      this.result = result;
-      this.callback = null;
-      this.errorCallback = null;
-      this.state = _FutureListener.STATE_CHAIN;
-      this[_nextListener] = null;
-    }
-    get [_zone]() {
-      return this.result[_zone];
-    }
-    get handlesValue() {
-      return (dart.notNull(this.state) & dart.notNull(_FutureListener.MASK_VALUE)) !== 0;
-    }
-    get handlesError() {
-      return (dart.notNull(this.state) & dart.notNull(_FutureListener.MASK_ERROR)) !== 0;
-    }
-    get hasErrorTest() {
-      return this.state === _FutureListener.STATE_CATCHERROR_TEST;
-    }
-    get handlesComplete() {
-      return this.state === _FutureListener.STATE_WHENCOMPLETE;
-    }
-    get [_onValue]() {
-      dart.assert(this.handlesValue);
-      return dart.as(this.callback, _FutureOnValue);
-    }
-    get [_onError]() {
-      return this.errorCallback;
-    }
-    get [_errorTest]() {
-      dart.assert(this.hasErrorTest);
-      return dart.as(this.callback, _FutureErrorTest);
-    }
-    get [_whenCompleteAction]() {
-      dart.assert(this.handlesComplete);
-      return dart.as(this.callback, _FutureAction);
-    }
-  }
-  dart.defineNamedConstructor(_FutureListener, 'then');
-  dart.defineNamedConstructor(_FutureListener, 'catchError');
-  dart.defineNamedConstructor(_FutureListener, 'whenComplete');
-  dart.defineNamedConstructor(_FutureListener, 'chain');
-  _FutureListener.MASK_VALUE = 1;
-  _FutureListener.MASK_ERROR = 2;
-  _FutureListener.MASK_TEST_ERROR = 4;
-  _FutureListener.MASK_WHENCOMPLETE = 8;
-  _FutureListener.STATE_CHAIN = 0;
-  _FutureListener.STATE_THEN = _FutureListener.MASK_VALUE;
-  _FutureListener.STATE_THEN_ONERROR = dart.notNull(_FutureListener.MASK_VALUE) | dart.notNull(_FutureListener.MASK_ERROR);
-  _FutureListener.STATE_CATCHERROR = _FutureListener.MASK_ERROR;
-  _FutureListener.STATE_CATCHERROR_TEST = dart.notNull(_FutureListener.MASK_ERROR) | dart.notNull(_FutureListener.MASK_TEST_ERROR);
-  _FutureListener.STATE_WHENCOMPLETE = _FutureListener.MASK_WHENCOMPLETE;
-  let _resultOrListeners = Symbol('_resultOrListeners');
-  let _asyncComplete = Symbol('_asyncComplete');
-  let _asyncCompleteError = Symbol('_asyncCompleteError');
-  let _isChained = Symbol('_isChained');
-  let _isComplete = Symbol('_isComplete');
-  let _hasValue = Symbol('_hasValue');
-  let _hasError = Symbol('_hasError');
-  let _markPendingCompletion = Symbol('_markPendingCompletion');
-  let _value = Symbol('_value');
-  let _error = Symbol('_error');
-  let _setValue = Symbol('_setValue');
-  let _setErrorObject = Symbol('_setErrorObject');
-  let _setError = Symbol('_setError');
-  let _removeListeners = Symbol('_removeListeners');
-  let _chainForeignFuture = Symbol('_chainForeignFuture');
-  let _chainCoreFuture = Symbol('_chainCoreFuture');
-  let _completeWithValue = Symbol('_completeWithValue');
-  let _propagateToListeners = Symbol('_propagateToListeners');
-  let _Future$ = dart.generic(function(T) {
-    class _Future extends core.Object {
-      _Future() {
-        this[_zone] = Zone.current;
-        this[_state] = _Future._INCOMPLETE;
-        this[_resultOrListeners] = null;
-      }
-      _Future$immediate(value) {
-        this[_zone] = Zone.current;
-        this[_state] = _Future._INCOMPLETE;
-        this[_resultOrListeners] = null;
-        this[_asyncComplete](value);
-      }
-      _Future$immediateError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        this[_zone] = Zone.current;
-        this[_state] = _Future._INCOMPLETE;
-        this[_resultOrListeners] = null;
-        this[_asyncCompleteError](error, stackTrace);
-      }
-      get [_mayComplete]() {
-        return this[_state] === _Future._INCOMPLETE;
-      }
-      get [_isChained]() {
-        return this[_state] === _Future._CHAINED;
-      }
-      get [_isComplete]() {
-        return dart.notNull(this[_state]) >= dart.notNull(_Future._VALUE);
-      }
-      get [_hasValue]() {
-        return this[_state] === _Future._VALUE;
-      }
-      get [_hasError]() {
-        return this[_state] === _Future._ERROR;
-      }
-      set [_isChained](value) {
-        if (value) {
-          dart.assert(!dart.notNull(this[_isComplete]));
-          this[_state] = _Future._CHAINED;
-        } else {
-          dart.assert(this[_isChained]);
-          this[_state] = _Future._INCOMPLETE;
-        }
-      }
-      then(f, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let result = new _Future();
-        if (!dart.notNull(core.identical(result[_zone], _ROOT_ZONE))) {
-          f = dart.closureWrap(result[_zone].registerUnaryCallback(f), "(T) → dynamic");
-          if (onError !== null) {
-            onError = _registerErrorHandler(onError, result[_zone]);
-          }
-        }
-        this[_addListener](new _FutureListener.then(result, f, onError));
-        return result;
-      }
-      catchError(onError, opt$) {
-        let test = opt$.test === void 0 ? null : opt$.test;
-        let result = new _Future();
-        if (!dart.notNull(core.identical(result[_zone], _ROOT_ZONE))) {
-          onError = _registerErrorHandler(onError, result[_zone]);
-          if (test !== null)
-            test = dart.closureWrap(result[_zone].registerUnaryCallback(test), "(dynamic) → bool");
-        }
-        this[_addListener](new _FutureListener.catchError(result, onError, test));
-        return result;
-      }
-      whenComplete(action) {
-        let result = new _Future();
-        if (!dart.notNull(core.identical(result[_zone], _ROOT_ZONE))) {
-          action = result[_zone].registerCallback(action);
-        }
-        this[_addListener](new _FutureListener.whenComplete(result, action));
-        return dart.as(result, Future$(T));
-      }
-      asStream() {
-        return dart.as(new Stream.fromFuture(this), Stream$(T));
-      }
-      [_markPendingCompletion]() {
-        if (!dart.notNull(this[_mayComplete]))
-          throw new core.StateError("Future already completed");
-        this[_state] = _Future._PENDING_COMPLETE;
-      }
-      get [_value]() {
-        dart.assert(dart.notNull(this[_isComplete]) && dart.notNull(this[_hasValue]));
-        return dart.as(this[_resultOrListeners], T);
-      }
-      get [_error]() {
-        dart.assert(dart.notNull(this[_isComplete]) && dart.notNull(this[_hasError]));
-        return dart.as(this[_resultOrListeners], AsyncError);
-      }
-      [_setValue](value) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        this[_state] = _Future._VALUE;
-        this[_resultOrListeners] = value;
-      }
-      [_setErrorObject](error) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        this[_state] = _Future._ERROR;
-        this[_resultOrListeners] = error;
-      }
-      [_setError](error, stackTrace) {
-        this[_setErrorObject](new AsyncError(error, stackTrace));
-      }
-      [_addListener](listener) {
-        dart.assert(listener[_nextListener] === null);
-        if (this[_isComplete]) {
-          this[_zone].scheduleMicrotask((() => {
-            _propagateToListeners(this, listener);
-          }).bind(this));
-        } else {
-          listener[_nextListener] = dart.as(this[_resultOrListeners], _FutureListener);
-          this[_resultOrListeners] = listener;
-        }
-      }
-      [_removeListeners]() {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        let current = dart.as(this[_resultOrListeners], _FutureListener);
-        this[_resultOrListeners] = null;
-        let prev = null;
-        while (current !== null) {
-          let next = current[_nextListener];
-          current[_nextListener] = prev;
-          prev = current;
-          current = next;
-        }
-        return prev;
-      }
-      static [_chainForeignFuture](source, target) {
-        dart.assert(!dart.notNull(target[_isComplete]));
-        dart.assert(!dart.is(source, _Future));
-        target[_isChained] = true;
-        source.then(((value) => {
-          dart.assert(target[_isChained]);
-          target._completeWithValue(value);
-        }).bind(this), {onError: ((error, stackTrace) => {
-            if (stackTrace === void 0)
-              stackTrace = null;
-            dart.assert(target[_isChained]);
-            target._completeError(error, dart.as(stackTrace, core.StackTrace));
-          }).bind(this)});
-      }
-      static [_chainCoreFuture](source, target) {
-        dart.assert(!dart.notNull(target[_isComplete]));
-        dart.assert(dart.is(source, _Future));
-        target[_isChained] = true;
-        let listener = new _FutureListener.chain(target);
-        if (source[_isComplete]) {
-          _propagateToListeners(source, listener);
-        } else {
-          source._addListener(listener);
-        }
-      }
-      [_complete](value) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        if (dart.is(value, Future)) {
-          if (dart.is(value, _Future)) {
-            _chainCoreFuture(dart.as(value, _Future), this);
-          } else {
-            _chainForeignFuture(dart.as(value, Future), this);
-          }
-        } else {
-          let listeners = this[_removeListeners]();
-          this[_setValue](dart.as(value, T));
-          _propagateToListeners(this, listeners);
-        }
-      }
-      [_completeWithValue](value) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        dart.assert(!dart.is(value, Future));
-        let listeners = this[_removeListeners]();
-        this[_setValue](dart.as(value, T));
-        _propagateToListeners(this, listeners);
-      }
-      [_completeError](error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        dart.assert(!dart.notNull(this[_isComplete]));
-        let listeners = this[_removeListeners]();
-        this[_setError](error, stackTrace);
-        _propagateToListeners(this, listeners);
-      }
-      [_asyncComplete](value) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        if (value === null) {
-        } else if (dart.is(value, Future)) {
-          let typedFuture = dart.as(value, Future$(T));
-          if (dart.is(typedFuture, _Future)) {
-            let coreFuture = dart.as(typedFuture, _Future$(T));
-            if (dart.notNull(coreFuture[_isComplete]) && dart.notNull(coreFuture[_hasError])) {
-              this[_markPendingCompletion]();
-              this[_zone].scheduleMicrotask((() => {
-                _chainCoreFuture(coreFuture, this);
-              }).bind(this));
-            } else {
-              _chainCoreFuture(coreFuture, this);
-            }
-          } else {
-            _chainForeignFuture(typedFuture, this);
-          }
-          return;
-        } else {
-          let typedValue = dart.as(value, T);
-        }
-        this[_markPendingCompletion]();
-        this[_zone].scheduleMicrotask((() => {
-          this[_completeWithValue](value);
-        }).bind(this));
-      }
-      [_asyncCompleteError](error, stackTrace) {
-        dart.assert(!dart.notNull(this[_isComplete]));
-        this[_markPendingCompletion]();
-        this[_zone].scheduleMicrotask((() => {
-          this[_completeError](error, stackTrace);
-        }).bind(this));
-      }
-      static [_propagateToListeners](source, listeners) {
-        while (true) {
-          dart.assert(source[_isComplete]);
-          let hasError = source[_hasError];
-          if (listeners === null) {
-            if (hasError) {
-              let asyncError = source[_error];
-              source[_zone].handleUncaughtError(asyncError.error, asyncError.stackTrace);
-            }
-            return;
-          }
-          while (listeners[_nextListener] !== null) {
-            let listener = listeners;
-            listeners = listener[_nextListener];
-            listener[_nextListener] = null;
-            _propagateToListeners(source, listener);
-          }
-          let listener = listeners;
-          let listenerHasValue = true;
-          let sourceValue = hasError ? null : source[_value];
-          let listenerValueOrError = sourceValue;
-          let isPropagationAborted = false;
-          if (dart.notNull(hasError) || dart.notNull(listener.handlesValue) || dart.notNull(listener.handlesComplete)) {
-            let zone = listener[_zone];
-            if (dart.notNull(hasError) && !dart.notNull(source[_zone].inSameErrorZone(zone))) {
-              let asyncError = source[_error];
-              source[_zone].handleUncaughtError(asyncError.error, asyncError.stackTrace);
-              return;
-            }
-            let oldZone = null;
-            if (!dart.notNull(core.identical(Zone.current, zone))) {
-              oldZone = Zone._enter(zone);
-            }
-            // Function handleValueCallback: () → bool
-            function handleValueCallback() {
-              try {
-                listenerValueOrError = zone.runUnary(listener[_onValue], sourceValue);
-                return true;
-              } catch (e) {
-                let s = dart.stackTrace(e);
-                listenerValueOrError = new AsyncError(e, s);
-                return false;
-              }
-
-            }
-            // Function handleError: () → void
-            function handleError() {
-              let asyncError = source[_error];
-              let matchesTest = true;
-              if (listener.hasErrorTest) {
-                let test = listener[_errorTest];
-                try {
-                  matchesTest = dart.as(zone.runUnary(test, asyncError.error), core.bool);
-                } catch (e) {
-                  let s = dart.stackTrace(e);
-                  listenerValueOrError = core.identical(asyncError.error, e) ? asyncError : new AsyncError(e, s);
-                  listenerHasValue = false;
-                  return;
-                }
-
-              }
-              let errorCallback = listener[_onError];
-              if (dart.notNull(matchesTest) && dart.notNull(errorCallback !== null)) {
-                try {
-                  if (dart.is(errorCallback, ZoneBinaryCallback)) {
-                    listenerValueOrError = zone.runBinary(errorCallback, asyncError.error, asyncError.stackTrace);
-                  } else {
-                    listenerValueOrError = zone.runUnary(dart.as(errorCallback, dart.throw_("Unimplemented type (dynamic) → dynamic")), asyncError.error);
-                  }
-                } catch (e) {
-                  let s = dart.stackTrace(e);
-                  listenerValueOrError = core.identical(asyncError.error, e) ? asyncError : new AsyncError(e, s);
-                  listenerHasValue = false;
-                  return;
-                }
-
-                listenerHasValue = true;
-              } else {
-                listenerValueOrError = asyncError;
-                listenerHasValue = false;
-              }
-            }
-            // Function handleWhenCompleteCallback: () → void
-            function handleWhenCompleteCallback() {
-              let completeResult = null;
-              try {
-                completeResult = zone.run(listener[_whenCompleteAction]);
-              } catch (e) {
-                let s = dart.stackTrace(e);
-                if (dart.notNull(hasError) && dart.notNull(core.identical(source[_error].error, e))) {
-                  listenerValueOrError = source[_error];
-                } else {
-                  listenerValueOrError = new AsyncError(e, s);
-                }
-                listenerHasValue = false;
-                return;
-              }
-
-              if (dart.is(completeResult, Future)) {
-                let result = listener.result;
-                result[_isChained] = true;
-                isPropagationAborted = true;
-                dart.dinvoke(completeResult, 'then', (ignored) => {
-                  _propagateToListeners(source, new _FutureListener.chain(result));
-                }, {
-                  onError: (error, stackTrace) => {
-                    if (stackTrace === void 0)
-                      stackTrace = null;
-                    if (!dart.is(completeResult, _Future)) {
-                      completeResult = new _Future();
-                      dart.dinvoke(completeResult, '_setError', error, stackTrace);
-                    }
-                    _propagateToListeners(dart.as(completeResult, _Future), new _FutureListener.chain(result));
-                  }
-                });
-              }
-            }
-            if (!dart.notNull(hasError)) {
-              if (listener.handlesValue) {
-                listenerHasValue = handleValueCallback();
-              }
-            } else {
-              handleError();
-            }
-            if (listener.handlesComplete) {
-              handleWhenCompleteCallback();
-            }
-            if (oldZone !== null)
-              Zone._leave(oldZone);
-            if (isPropagationAborted)
-              return;
-            if (dart.notNull(listenerHasValue) && !dart.notNull(core.identical(sourceValue, listenerValueOrError)) && dart.notNull(dart.is(listenerValueOrError, Future))) {
-              let chainSource = dart.as(listenerValueOrError, Future);
-              let result = listener.result;
-              if (dart.is(chainSource, _Future)) {
-                if (chainSource[_isComplete]) {
-                  result[_isChained] = true;
-                  source = chainSource;
-                  listeners = new _FutureListener.chain(result);
-                  continue;
-                } else {
-                  _chainCoreFuture(chainSource, result);
-                }
-              } else {
-                _chainForeignFuture(chainSource, result);
-              }
-              return;
-            }
-          }
-          let result = listener.result;
-          listeners = result._removeListeners();
-          if (listenerHasValue) {
-            result._setValue(listenerValueOrError);
-          } else {
-            let asyncError = dart.as(listenerValueOrError, AsyncError);
-            result._setErrorObject(asyncError);
-          }
-          source = result;
-        }
-      }
-      timeout(timeLimit, opt$) {
-        let onTimeout = opt$.onTimeout === void 0 ? null : opt$.onTimeout;
-        if (this[_isComplete])
-          return new _Future.immediate(this);
-        let result = new _Future();
-        let timer = null;
-        if (onTimeout === null) {
-          timer = new Timer(timeLimit, (() => {
-            result._completeError(new TimeoutException("Future not completed", timeLimit));
-          }).bind(this));
-        } else {
-          let zone = Zone.current;
-          onTimeout = zone.registerCallback(onTimeout);
-          timer = new Timer(timeLimit, (() => {
-            try {
-              result._complete(zone.run(onTimeout));
-            } catch (e) {
-              let s = dart.stackTrace(e);
-              result._completeError(e, s);
-            }
-
-          }).bind(this));
-        }
-        this.then(((v) => {
-          if (timer.isActive) {
-            timer.cancel();
-            result._completeWithValue(v);
-          }
-        }).bind(this), {onError: ((e, s) => {
-            if (timer.isActive) {
-              timer.cancel();
-              result._completeError(e, dart.as(s, core.StackTrace));
-            }
-          }).bind(this)});
-        return result;
-      }
-    }
-    dart.defineNamedConstructor(_Future, 'immediate');
-    dart.defineNamedConstructor(_Future, 'immediateError');
-    _Future._INCOMPLETE = 0;
-    _Future._PENDING_COMPLETE = 1;
-    _Future._CHAINED = 2;
-    _Future._VALUE = 4;
-    _Future._ERROR = 8;
-    return _Future;
-  });
-  let _Future = _Future$(dart.dynamic);
-  class _AsyncCallbackEntry extends core.Object {
-    _AsyncCallbackEntry(callback) {
-      this.callback = callback;
-      this.next = null;
-    }
-  }
-  exports._nextCallback = null;
-  exports._lastCallback = null;
-  exports._lastPriorityCallback = null;
-  exports._isInCallbackLoop = false;
-  // Function _asyncRunCallbackLoop: () → void
-  function _asyncRunCallbackLoop() {
-    while (exports._nextCallback !== null) {
-      exports._lastPriorityCallback = null;
-      let entry = exports._nextCallback;
-      exports._nextCallback = entry.next;
-      if (exports._nextCallback === null)
-        exports._lastCallback = null;
-      entry.callback();
-    }
-  }
-  // Function _asyncRunCallback: () → void
-  function _asyncRunCallback() {
-    exports._isInCallbackLoop = true;
-    try {
-      _asyncRunCallbackLoop();
-    } finally {
-      exports._lastPriorityCallback = null;
-      exports._isInCallbackLoop = false;
-      if (exports._nextCallback !== null)
-        _AsyncRun._scheduleImmediate(_asyncRunCallback);
-    }
-  }
-  // Function _scheduleAsyncCallback: (dynamic) → void
-  function _scheduleAsyncCallback(callback) {
-    if (exports._nextCallback === null) {
-      exports._nextCallback = exports._lastCallback = new _AsyncCallbackEntry(dart.as(callback, _AsyncCallback));
-      if (!dart.notNull(exports._isInCallbackLoop)) {
-        _AsyncRun._scheduleImmediate(_asyncRunCallback);
-      }
-    } else {
-      let newEntry = new _AsyncCallbackEntry(dart.as(callback, _AsyncCallback));
-      exports._lastCallback.next = newEntry;
-      exports._lastCallback = newEntry;
-    }
-  }
-  // Function _schedulePriorityAsyncCallback: (dynamic) → void
-  function _schedulePriorityAsyncCallback(callback) {
-    let entry = new _AsyncCallbackEntry(dart.as(callback, _AsyncCallback));
-    if (exports._nextCallback === null) {
-      _scheduleAsyncCallback(callback);
-      exports._lastPriorityCallback = exports._lastCallback;
-    } else if (exports._lastPriorityCallback === null) {
-      entry.next = exports._nextCallback;
-      exports._nextCallback = exports._lastPriorityCallback = entry;
-    } else {
-      entry.next = exports._lastPriorityCallback.next;
-      exports._lastPriorityCallback.next = entry;
-      exports._lastPriorityCallback = entry;
-      if (entry.next === null) {
-        exports._lastCallback = entry;
-      }
-    }
-  }
-  // Function scheduleMicrotask: (() → void) → void
-  function scheduleMicrotask(callback) {
-    if (core.identical(_ROOT_ZONE, Zone.current)) {
-      _rootScheduleMicrotask(null, null, _ROOT_ZONE, callback);
-      return;
-    }
-    Zone.current.scheduleMicrotask(Zone.current.bindCallback(callback, {runGuarded: true}));
-  }
-  let _scheduleImmediate = Symbol('_scheduleImmediate');
-  let _initializeScheduleImmediate = Symbol('_initializeScheduleImmediate');
-  let _scheduleImmediateJsOverride = Symbol('_scheduleImmediateJsOverride');
-  let _scheduleImmediateWithSetImmediate = Symbol('_scheduleImmediateWithSetImmediate');
-  let _scheduleImmediateWithTimer = Symbol('_scheduleImmediateWithTimer');
-  class _AsyncRun extends core.Object {
-    static [_scheduleImmediate](callback) {
-      dart.dinvokef(scheduleImmediateClosure, callback);
-    }
-    static [_initializeScheduleImmediate]() {
-      _js_helper.requiresPreamble();
-      if (self.scheduleImmediate !== null) {
-        return _scheduleImmediateJsOverride;
-      }
-      if (dart.notNull(self.MutationObserver !== null) && dart.notNull(self.document !== null)) {
-        let div = self.document.createElement("div");
-        let span = self.document.createElement("span");
-        let storedCallback = null;
-        // Function internalCallback: (dynamic) → dynamic
-        function internalCallback(_) {
-          _isolate_helper.leaveJsAsync();
-          let f = storedCallback;
-          storedCallback = null;
-          dart.dinvokef(f);
-        }
-        ;
-        let observer = new self.MutationObserver(_js_helper.convertDartClosureToJS(internalCallback, 1));
-        observer.observe(div, {childList: true});
-        return (callback) => {
-          dart.assert(storedCallback === null);
-          _isolate_helper.enterJsAsync();
-          storedCallback = callback;
-          div.firstChild ? div.removeChild(span) : div.appendChild(span);
-        };
-      } else if (self.setImmediate !== null) {
-        return _scheduleImmediateWithSetImmediate;
-      }
-      return _scheduleImmediateWithTimer;
-    }
-    static [_scheduleImmediateJsOverride](callback) {
-      // Function internalCallback: () → dynamic
-      function internalCallback() {
-        _isolate_helper.leaveJsAsync();
-        callback();
-      }
-      ;
-      _isolate_helper.enterJsAsync();
-      self.scheduleImmediate(_js_helper.convertDartClosureToJS(internalCallback, 0));
-    }
-    static [_scheduleImmediateWithSetImmediate](callback) {
-      // Function internalCallback: () → dynamic
-      function internalCallback() {
-        _isolate_helper.leaveJsAsync();
-        callback();
-      }
-      ;
-      _isolate_helper.enterJsAsync();
-      self.setImmediate(_js_helper.convertDartClosureToJS(internalCallback, 0));
-    }
-    static [_scheduleImmediateWithTimer](callback) {
-      Timer._createTimer(core.Duration.ZERO, callback);
-    }
-  }
-  dart.defineLazyProperties(_AsyncRun, {
-    get scheduleImmediateClosure() {
-      return _initializeScheduleImmediate();
-    }
-  });
-  let StreamSubscription$ = dart.generic(function(T) {
-    class StreamSubscription extends core.Object {
-    }
-    return StreamSubscription;
-  });
-  let StreamSubscription = StreamSubscription$(dart.dynamic);
-  let EventSink$ = dart.generic(function(T) {
-    class EventSink extends core.Object {
-    }
-    return EventSink;
-  });
-  let EventSink = EventSink$(dart.dynamic);
-  let _stream = Symbol('_stream');
-  let StreamView$ = dart.generic(function(T) {
-    class StreamView extends Stream$(T) {
-      StreamView($_stream) {
-        this[_stream] = $_stream;
-        super.Stream();
-      }
-      get isBroadcast() {
-        return this[_stream].isBroadcast;
-      }
-      asBroadcastStream(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        return this[_stream].asBroadcastStream({onListen: onListen, onCancel: onCancel});
-      }
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        return this[_stream].listen(onData, {onError: onError, onDone: onDone, cancelOnError: cancelOnError});
-      }
-    }
-    return StreamView;
-  });
-  let StreamView = StreamView$(dart.dynamic);
-  let StreamConsumer$ = dart.generic(function(S) {
-    class StreamConsumer extends core.Object {
-    }
-    return StreamConsumer;
-  });
-  let StreamConsumer = StreamConsumer$(dart.dynamic);
-  let StreamSink$ = dart.generic(function(S) {
-    class StreamSink extends core.Object {
-    }
-    return StreamSink;
-  });
-  let StreamSink = StreamSink$(dart.dynamic);
-  let StreamTransformer$ = dart.generic(function(S, T) {
-    class StreamTransformer extends core.Object {
-      StreamTransformer(transformer) {
-        return new _StreamSubscriptionTransformer(transformer);
-      }
-      StreamTransformer$fromHandlers(opt$) {
-        return new _StreamHandlerTransformer(opt$);
-      }
-    }
-    dart.defineNamedConstructor(StreamTransformer, 'fromHandlers');
-    return StreamTransformer;
-  });
-  let StreamTransformer = StreamTransformer$(dart.dynamic, dart.dynamic);
-  let StreamIterator$ = dart.generic(function(T) {
-    class StreamIterator extends core.Object {
-      StreamIterator(stream) {
-        return new _StreamIteratorImpl(stream);
-      }
-    }
-    return StreamIterator;
-  });
-  let StreamIterator = StreamIterator$(dart.dynamic);
-  let _ControllerEventSinkWrapper$ = dart.generic(function(T) {
-    class _ControllerEventSinkWrapper extends core.Object {
-      _ControllerEventSinkWrapper($_sink) {
-        this[_sink] = $_sink;
-      }
-      add(data) {
-        this[_sink].add(data);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        this[_sink].addError(error, stackTrace);
-      }
-      close() {
-        this[_sink].close();
-      }
-    }
-    return _ControllerEventSinkWrapper;
-  });
-  let _ControllerEventSinkWrapper = _ControllerEventSinkWrapper$(dart.dynamic);
-  let StreamController$ = dart.generic(function(T) {
-    class StreamController extends core.Object {
-      StreamController(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onPause = opt$.onPause === void 0 ? null : opt$.onPause;
-        let onResume = opt$.onResume === void 0 ? null : opt$.onResume;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        let sync = opt$.sync === void 0 ? false : opt$.sync;
-        if (dart.notNull(onListen === null) && dart.notNull(onPause === null) && dart.notNull(onResume === null) && dart.notNull(onCancel === null)) {
-          return dart.as(sync ? new _NoCallbackSyncStreamController() : new _NoCallbackAsyncStreamController(), StreamController$(T));
-        }
-        return sync ? new _SyncStreamController(onListen, onPause, onResume, onCancel) : new _AsyncStreamController(onListen, onPause, onResume, onCancel);
-      }
-      StreamController$broadcast(opt$) {
-        let onListen = opt$.onListen === void 0 ? null : opt$.onListen;
-        let onCancel = opt$.onCancel === void 0 ? null : opt$.onCancel;
-        let sync = opt$.sync === void 0 ? false : opt$.sync;
-        return sync ? new _SyncBroadcastStreamController(onListen, onCancel) : new _AsyncBroadcastStreamController(onListen, onCancel);
-      }
-    }
-    dart.defineNamedConstructor(StreamController, 'broadcast');
-    return StreamController;
-  });
-  let StreamController = StreamController$(dart.dynamic);
-  let _StreamControllerLifecycle$ = dart.generic(function(T) {
-    class _StreamControllerLifecycle extends core.Object {
-      [_recordPause](subscription) {}
-      [_recordResume](subscription) {}
-      [_recordCancel](subscription) {
-        return null;
-      }
-    }
-    return _StreamControllerLifecycle;
-  });
-  let _StreamControllerLifecycle = _StreamControllerLifecycle$(dart.dynamic);
-  let _varData = Symbol('_varData');
-  let _isInitialState = Symbol('_isInitialState');
-  let _subscription = Symbol('_subscription');
-  let _pendingEvents = Symbol('_pendingEvents');
-  let _ensurePendingEvents = Symbol('_ensurePendingEvents');
-  let _badEventState = Symbol('_badEventState');
-  let _nullFuture = Symbol('_nullFuture');
-  let _closeUnchecked = Symbol('_closeUnchecked');
-  let _StreamController$ = dart.generic(function(T) {
-    class _StreamController extends core.Object {
-      _StreamController() {
-        this[_varData] = null;
-        this[_state] = _StreamController._STATE_INITIAL;
-        this[_doneFuture] = null;
-      }
-      get stream() {
-        return dart.as(new _ControllerStream(this), Stream$(T));
-      }
-      get sink() {
-        return new _StreamSinkWrapper(this);
-      }
-      get [_isCanceled]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_StreamController._STATE_CANCELED)) !== 0;
-      }
-      get hasListener() {
-        return (dart.notNull(this[_state]) & dart.notNull(_StreamController._STATE_SUBSCRIBED)) !== 0;
-      }
-      get [_isInitialState]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_StreamController._STATE_SUBSCRIPTION_MASK)) === _StreamController._STATE_INITIAL;
-      }
-      get isClosed() {
-        return (dart.notNull(this[_state]) & dart.notNull(_StreamController._STATE_CLOSED)) !== 0;
-      }
-      get isPaused() {
-        return this.hasListener ? this[_subscription][_isInputPaused] : !dart.notNull(this[_isCanceled]);
-      }
-      get [_isAddingStream]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_StreamController._STATE_ADDSTREAM)) !== 0;
-      }
-      get [_mayAddEvent]() {
-        return dart.notNull(this[_state]) < dart.notNull(_StreamController._STATE_CLOSED);
-      }
-      get [_pendingEvents]() {
-        dart.assert(this[_isInitialState]);
-        if (!dart.notNull(this[_isAddingStream])) {
-          return dart.as(this[_varData], _PendingEvents);
-        }
-        let state = dart.as(this[_varData], _StreamControllerAddStreamState);
-        return dart.as(state.varData, _PendingEvents);
-      }
-      [_ensurePendingEvents]() {
-        dart.assert(this[_isInitialState]);
-        if (!dart.notNull(this[_isAddingStream])) {
-          if (this[_varData] === null)
-            this[_varData] = new _StreamImplEvents();
-          return dart.as(this[_varData], _StreamImplEvents);
-        }
-        let state = dart.as(this[_varData], _StreamControllerAddStreamState);
-        if (state.varData === null)
-          state.varData = new _StreamImplEvents();
-        return dart.as(state.varData, _StreamImplEvents);
-      }
-      get [_subscription]() {
-        dart.assert(this.hasListener);
-        if (this[_isAddingStream]) {
-          let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-          return dart.as(addState.varData, _ControllerSubscription);
-        }
-        return dart.as(this[_varData], _ControllerSubscription);
-      }
-      [_badEventState]() {
-        if (this.isClosed) {
-          return new core.StateError("Cannot add event after closing");
-        }
-        dart.assert(this[_isAddingStream]);
-        return new core.StateError("Cannot add event while adding a stream");
-      }
-      addStream(source, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_badEventState]();
-        if (this[_isCanceled])
-          return new _Future.immediate(null);
-        let addState = new _StreamControllerAddStreamState(this, this[_varData], source, cancelOnError);
-        this[_varData] = addState;
-        this[_state] = _StreamController._STATE_ADDSTREAM;
-        return addState.addStreamFuture;
-      }
-      get done() {
-        return this[_ensureDoneFuture]();
-      }
-      [_ensureDoneFuture]() {
-        if (this[_doneFuture] === null) {
-          this[_doneFuture] = this[_isCanceled] ? Future[_nullFuture] : new _Future();
-        }
-        return this[_doneFuture];
-      }
-      add(value) {
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_badEventState]();
-        this[_add](value);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        error = _nonNullError(error);
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_badEventState]();
-        let replacement = Zone.current.errorCallback(error, stackTrace);
-        if (replacement !== null) {
-          error = _nonNullError(replacement.error);
-          stackTrace = replacement.stackTrace;
-        }
-        this[_addError](error, stackTrace);
-      }
-      close() {
-        if (this.isClosed) {
-          return this[_ensureDoneFuture]();
-        }
-        if (!dart.notNull(this[_mayAddEvent]))
-          throw this[_badEventState]();
-        this[_closeUnchecked]();
-        return this[_ensureDoneFuture]();
-      }
-      [_closeUnchecked]() {
-        this[_state] = _StreamController._STATE_CLOSED;
-        if (this.hasListener) {
-          this[_sendDone]();
-        } else if (this[_isInitialState]) {
-          this[_ensurePendingEvents]().add(new _DelayedDone());
-        }
-      }
-      [_add](value) {
-        if (this.hasListener) {
-          this[_sendData](value);
-        } else if (this[_isInitialState]) {
-          this[_ensurePendingEvents]().add(new _DelayedData(value));
-        }
-      }
-      [_addError](error, stackTrace) {
-        if (this.hasListener) {
-          this[_sendError](error, stackTrace);
-        } else if (this[_isInitialState]) {
-          this[_ensurePendingEvents]().add(new _DelayedError(error, stackTrace));
-        }
-      }
-      [_close]() {
-        dart.assert(this[_isAddingStream]);
-        let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-        this[_varData] = addState.varData;
-        this[_state] = ~dart.notNull(_StreamController._STATE_ADDSTREAM);
-        addState.complete();
-      }
-      [_subscribe](onData, onError, onDone, cancelOnError) {
-        if (!dart.notNull(this[_isInitialState])) {
-          throw new core.StateError("Stream has already been listened to.");
-        }
-        let subscription = new _ControllerSubscription(this, onData, onError, onDone, cancelOnError);
-        let pendingEvents = this[_pendingEvents];
-        this[_state] = _StreamController._STATE_SUBSCRIBED;
-        if (this[_isAddingStream]) {
-          let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-          addState.varData = subscription;
-          addState.resume();
-        } else {
-          this[_varData] = subscription;
-        }
-        subscription._setPendingEvents(pendingEvents);
-        subscription._guardCallback((() => {
-          _runGuarded(this[_onListen]);
-        }).bind(this));
-        return dart.as(subscription, StreamSubscription$(T));
-      }
-      [_recordCancel](subscription) {
-        let result = null;
-        if (this[_isAddingStream]) {
-          let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-          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 _;
-              }).bind(this)(new _Future());
-            }
-
-          } 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);
-          }
-        }
-        if (result !== null) {
-          result = result.whenComplete(complete);
-        } else {
-          complete();
-        }
-        return result;
-      }
-      [_recordPause](subscription) {
-        if (this[_isAddingStream]) {
-          let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-          addState.pause();
-        }
-        _runGuarded(this[_onPause]);
-      }
-      [_recordResume](subscription) {
-        if (this[_isAddingStream]) {
-          let addState = dart.as(this[_varData], _StreamControllerAddStreamState);
-          addState.resume();
-        }
-        _runGuarded(this[_onResume]);
-      }
-    }
-    _StreamController._STATE_INITIAL = 0;
-    _StreamController._STATE_SUBSCRIBED = 1;
-    _StreamController._STATE_CANCELED = 2;
-    _StreamController._STATE_SUBSCRIPTION_MASK = 3;
-    _StreamController._STATE_CLOSED = 4;
-    _StreamController._STATE_ADDSTREAM = 8;
-    return _StreamController;
-  });
-  let _StreamController = _StreamController$(dart.dynamic);
-  let _SyncStreamControllerDispatch$ = dart.generic(function(T) {
-    class _SyncStreamControllerDispatch extends core.Object {
-      [_sendData](data) {
-        this[_subscription]._add(data);
-      }
-      [_sendError](error, stackTrace) {
-        this[_subscription]._addError(error, stackTrace);
-      }
-      [_sendDone]() {
-        this[_subscription]._close();
-      }
-    }
-    return _SyncStreamControllerDispatch;
-  });
-  let _SyncStreamControllerDispatch = _SyncStreamControllerDispatch$(dart.dynamic);
-  let _AsyncStreamControllerDispatch$ = dart.generic(function(T) {
-    class _AsyncStreamControllerDispatch extends core.Object {
-      [_sendData](data) {
-        this[_subscription]._addPending(new _DelayedData(data));
-      }
-      [_sendError](error, stackTrace) {
-        this[_subscription]._addPending(new _DelayedError(error, stackTrace));
-      }
-      [_sendDone]() {
-        this[_subscription]._addPending(new _DelayedDone());
-      }
-    }
-    return _AsyncStreamControllerDispatch;
-  });
-  let _AsyncStreamControllerDispatch = _AsyncStreamControllerDispatch$(dart.dynamic);
-  let _AsyncStreamController$ = dart.generic(function(T) {
-    class _AsyncStreamController extends dart.mixin(_StreamController$(T), _AsyncStreamControllerDispatch$(T)) {
-      _AsyncStreamController($_onListen, $_onPause, $_onResume, $_onCancel) {
-        this[_onListen] = $_onListen;
-        this[_onPause] = $_onPause;
-        this[_onResume] = $_onResume;
-        this[_onCancel] = $_onCancel;
-        super._StreamController();
-      }
-    }
-    return _AsyncStreamController;
-  });
-  let _AsyncStreamController = _AsyncStreamController$(dart.dynamic);
-  let _SyncStreamController$ = dart.generic(function(T) {
-    class _SyncStreamController extends dart.mixin(_StreamController$(T), _SyncStreamControllerDispatch$(T)) {
-      _SyncStreamController($_onListen, $_onPause, $_onResume, $_onCancel) {
-        this[_onListen] = $_onListen;
-        this[_onPause] = $_onPause;
-        this[_onResume] = $_onResume;
-        this[_onCancel] = $_onCancel;
-        super._StreamController();
-      }
-    }
-    return _SyncStreamController;
-  });
-  let _SyncStreamController = _SyncStreamController$(dart.dynamic);
-  class _NoCallbacks extends core.Object {
-    get [_onListen]() {
-      return null;
-    }
-    get [_onPause]() {
-      return null;
-    }
-    get [_onResume]() {
-      return null;
-    }
-    get [_onCancel]() {
-      return null;
-    }
-  }
-  class _NoCallbackAsyncStreamController extends dart.mixin(_AsyncStreamControllerDispatch, _NoCallbacks) {
-  }
-  class _NoCallbackSyncStreamController extends dart.mixin(_SyncStreamControllerDispatch, _NoCallbacks) {
-  }
-  // Function _runGuarded: (() → dynamic) → Future<dynamic>
-  function _runGuarded(notificationHandler) {
-    if (notificationHandler === null)
-      return null;
-    try {
-      let result = notificationHandler();
-      if (dart.is(result, Future))
-        return dart.as(result, Future);
-      return null;
-    } catch (e) {
-      let s = dart.stackTrace(e);
-      Zone.current.handleUncaughtError(e, s);
-    }
-
-  }
-  let _target = Symbol('_target');
-  let _StreamSinkWrapper$ = dart.generic(function(T) {
-    class _StreamSinkWrapper extends core.Object {
-      _StreamSinkWrapper($_target) {
-        this[_target] = $_target;
-      }
-      add(data) {
-        this[_target].add(data);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        this[_target].addError(error, stackTrace);
-      }
-      close() {
-        return this[_target].close();
-      }
-      addStream(source, opt$) {
-        let cancelOnError = opt$.cancelOnError === void 0 ? true : opt$.cancelOnError;
-        return this[_target].addStream(source, {cancelOnError: cancelOnError});
-      }
-      get done() {
-        return this[_target].done;
-      }
-    }
-    return _StreamSinkWrapper;
-  });
-  let _StreamSinkWrapper = _StreamSinkWrapper$(dart.dynamic);
-  let _AddStreamState$ = dart.generic(function(T) {
-    class _AddStreamState extends core.Object {
-      _AddStreamState(controller, source, cancelOnError) {
-        this.addStreamFuture = new _Future();
-        this.addSubscription = source.listen(controller[_add], {onError: dart.as(cancelOnError ? makeErrorHandler(controller) : controller[_addError], core.Function), onDone: controller[_close], cancelOnError: cancelOnError});
-      }
-      static makeErrorHandler(controller) {
-        return ((e, s) => {
-          controller._addError(e, s);
-          controller._close();
-        }).bind(this);
-      }
-      pause() {
-        this.addSubscription.pause();
-      }
-      resume() {
-        this.addSubscription.resume();
-      }
-      cancel() {
-        let cancel = this.addSubscription.cancel();
-        if (cancel === null) {
-          this.addStreamFuture._asyncComplete(null);
-          return null;
-        }
-        return cancel.whenComplete((() => {
-          this.addStreamFuture._asyncComplete(null);
-        }).bind(this));
-      }
-      complete() {
-        this.addStreamFuture._asyncComplete(null);
-      }
-    }
-    return _AddStreamState;
-  });
-  let _AddStreamState = _AddStreamState$(dart.dynamic);
-  let _StreamControllerAddStreamState$ = dart.generic(function(T) {
-    class _StreamControllerAddStreamState extends _AddStreamState$(T) {
-      _StreamControllerAddStreamState(controller, varData, source, cancelOnError) {
-        this.varData = varData;
-        super._AddStreamState(dart.as(controller, _EventSink$(T)), source, cancelOnError);
-        if (controller.isPaused) {
-          this.addSubscription.pause();
-        }
-      }
-    }
-    return _StreamControllerAddStreamState;
-  });
-  let _StreamControllerAddStreamState = _StreamControllerAddStreamState$(dart.dynamic);
-  let _EventSink$ = dart.generic(function(T) {
-    class _EventSink extends core.Object {
-    }
-    return _EventSink;
-  });
-  let _EventSink = _EventSink$(dart.dynamic);
-  let _EventDispatch$ = dart.generic(function(T) {
-    class _EventDispatch extends core.Object {
-    }
-    return _EventDispatch;
-  });
-  let _EventDispatch = _EventDispatch$(dart.dynamic);
-  let _isUsed = Symbol('_isUsed');
-  let _GeneratedStreamImpl$ = dart.generic(function(T) {
-    class _GeneratedStreamImpl extends _StreamImpl$(T) {
-      _GeneratedStreamImpl($_pending) {
-        this[_pending] = $_pending;
-        this[_isUsed] = false;
-        super._StreamImpl();
-      }
-      [_createSubscription](onData, onError, onDone, cancelOnError) {
-        if (this[_isUsed])
-          throw new core.StateError("Stream has already been listened to.");
-        this[_isUsed] = true;
-        return ((_) => {
-          _._setPendingEvents(this[_pending]());
-          return _;
-        }).bind(this)(new _BufferingStreamSubscription(onData, onError, onDone, cancelOnError));
-      }
-    }
-    return _GeneratedStreamImpl;
-  });
-  let _GeneratedStreamImpl = _GeneratedStreamImpl$(dart.dynamic);
-  let _iterator = Symbol('_iterator');
-  let _eventScheduled = Symbol('_eventScheduled');
-  class _PendingEvents extends core.Object {
-    _PendingEvents() {
-      this[_state] = _PendingEvents._STATE_UNSCHEDULED;
-    }
-    get isScheduled() {
-      return this[_state] === _PendingEvents._STATE_SCHEDULED;
-    }
-    get [_eventScheduled]() {
-      return dart.notNull(this[_state]) >= dart.notNull(_PendingEvents._STATE_SCHEDULED);
-    }
-    schedule(dispatch) {
-      if (this.isScheduled)
-        return;
-      dart.assert(!dart.notNull(this.isEmpty));
-      if (this[_eventScheduled]) {
-        dart.assert(this[_state] === _PendingEvents._STATE_CANCELED);
-        this[_state] = _PendingEvents._STATE_SCHEDULED;
-        return;
-      }
-      scheduleMicrotask((() => {
-        let oldState = this[_state];
-        this[_state] = _PendingEvents._STATE_UNSCHEDULED;
-        if (oldState === _PendingEvents._STATE_CANCELED)
-          return;
-        this.handleNext(dispatch);
-      }).bind(this));
-      this[_state] = _PendingEvents._STATE_SCHEDULED;
-    }
-    cancelSchedule() {
-      if (this.isScheduled)
-        this[_state] = _PendingEvents._STATE_CANCELED;
-    }
-  }
-  _PendingEvents._STATE_UNSCHEDULED = 0;
-  _PendingEvents._STATE_SCHEDULED = 1;
-  _PendingEvents._STATE_CANCELED = 3;
-  let _IterablePendingEvents$ = dart.generic(function(T) {
-    class _IterablePendingEvents extends _PendingEvents {
-      _IterablePendingEvents(data) {
-        this[_iterator] = data.iterator;
-        super._PendingEvents();
-      }
-      get isEmpty() {
-        return this[_iterator] === null;
-      }
-      handleNext(dispatch) {
-        if (this[_iterator] === null) {
-          throw new core.StateError("No events pending.");
-        }
-        let isDone = null;
-        try {
-          isDone = !dart.notNull(this[_iterator].moveNext());
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          this[_iterator] = null;
-          dispatch._sendError(e, s);
-          return;
-        }
-
-        if (!dart.notNull(isDone)) {
-          dispatch._sendData(this[_iterator].current);
-        } else {
-          this[_iterator] = null;
-          dispatch._sendDone();
-        }
-      }
-      clear() {
-        if (this.isScheduled)
-          this.cancelSchedule();
-        this[_iterator] = null;
-      }
-    }
-    return _IterablePendingEvents;
-  });
-  let _IterablePendingEvents = _IterablePendingEvents$(dart.dynamic);
-  // Function _nullDataHandler: (dynamic) → void
-  function _nullDataHandler(value) {
-  }
-  // Function _nullErrorHandler: (dynamic, [StackTrace]) → void
-  function _nullErrorHandler(error, stackTrace) {
-    if (stackTrace === void 0)
-      stackTrace = null;
-    Zone.current.handleUncaughtError(error, stackTrace);
-  }
-  // Function _nullDoneHandler: () → void
-  function _nullDoneHandler() {
-  }
-  class _DelayedEvent extends core.Object {
-    _DelayedEvent() {
-      this.next = null;
-    }
-  }
-  let _DelayedData$ = dart.generic(function(T) {
-    class _DelayedData extends _DelayedEvent {
-      _DelayedData(value) {
-        this.value = value;
-        super._DelayedEvent();
-      }
-      perform(dispatch) {
-        dispatch._sendData(this.value);
-      }
-    }
-    return _DelayedData;
-  });
-  let _DelayedData = _DelayedData$(dart.dynamic);
-  class _DelayedError extends _DelayedEvent {
-    _DelayedError(error, stackTrace) {
-      this.error = error;
-      this.stackTrace = stackTrace;
-      super._DelayedEvent();
-    }
-    perform(dispatch) {
-      dispatch._sendError(this.error, this.stackTrace);
-    }
-  }
-  class _DelayedDone extends core.Object {
-    _DelayedDone() {
-    }
-    perform(dispatch) {
-      dispatch._sendDone();
-    }
-    get next() {
-      return null;
-    }
-    set next(_) {
-      throw new core.StateError("No events after a done.");
-    }
-  }
-  class _StreamImplEvents extends _PendingEvents {
-    _StreamImplEvents() {
-      this.firstPendingEvent = null;
-      this.lastPendingEvent = null;
-      super._PendingEvents();
-    }
-    get isEmpty() {
-      return this.lastPendingEvent === null;
-    }
-    add(event) {
-      if (this.lastPendingEvent === null) {
-        this.firstPendingEvent = this.lastPendingEvent = event;
-      } else {
-        this.lastPendingEvent = this.lastPendingEvent.next = event;
-      }
-    }
-    handleNext(dispatch) {
-      dart.assert(!dart.notNull(this.isScheduled));
-      let event = this.firstPendingEvent;
-      this.firstPendingEvent = event.next;
-      if (this.firstPendingEvent === null) {
-        this.lastPendingEvent = null;
-      }
-      event.perform(dispatch);
-    }
-    clear() {
-      if (this.isScheduled)
-        this.cancelSchedule();
-      this.firstPendingEvent = this.lastPendingEvent = null;
-    }
-  }
-  let _unlink = Symbol('_unlink');
-  let _insertBefore = Symbol('_insertBefore');
-  class _BroadcastLinkedList extends core.Object {
-    _BroadcastLinkedList() {
-      this[_next] = null;
-      this[_previous] = null;
-    }
-    [_unlink]() {
-      this[_previous][_next] = this[_next];
-      this[_next][_previous] = this[_previous];
-      this[_next] = this[_previous] = this;
-    }
-    [_insertBefore](newNext) {
-      let newPrevious = newNext[_previous];
-      newPrevious[_next] = this;
-      newNext[_previous] = this[_previous];
-      this[_previous][_next] = newNext;
-      this[_previous] = newPrevious;
-    }
-  }
-  let _schedule = Symbol('_schedule');
-  let _isSent = Symbol('_isSent');
-  let _isScheduled = Symbol('_isScheduled');
-  let _DoneStreamSubscription$ = dart.generic(function(T) {
-    class _DoneStreamSubscription extends core.Object {
-      _DoneStreamSubscription($_onDone) {
-        this[_onDone] = $_onDone;
-        this[_zone] = Zone.current;
-        this[_state] = 0;
-        this[_schedule]();
-      }
-      get [_isSent]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_DoneStreamSubscription._DONE_SENT)) !== 0;
-      }
-      get [_isScheduled]() {
-        return (dart.notNull(this[_state]) & dart.notNull(_DoneStreamSubscription._SCHEDULED)) !== 0;
-      }
-      get isPaused() {
-        return dart.notNull(this[_state]) >= dart.notNull(_DoneStreamSubscription._PAUSED);
-      }
-      [_schedule]() {
-        if (this[_isScheduled])
-          return;
-        this[_zone].scheduleMicrotask(this[_sendDone]);
-        this[_state] = _DoneStreamSubscription._SCHEDULED;
-      }
-      onData(handleData) {}
-      onError(handleError) {}
-      onDone(handleDone) {
-        this[_onDone] = handleDone;
-      }
-      pause(resumeSignal) {
-        if (resumeSignal === void 0)
-          resumeSignal = null;
-        this[_state] = _DoneStreamSubscription._PAUSED;
-        if (resumeSignal !== null)
-          resumeSignal.whenComplete(this.resume);
-      }
-      resume() {
-        if (this.isPaused) {
-          this[_state] = _DoneStreamSubscription._PAUSED;
-          if (!dart.notNull(this.isPaused) && !dart.notNull(this[_isSent])) {
-            this[_schedule]();
-          }
-        }
-      }
-      cancel() {
-        return null;
-      }
-      asFuture(futureValue) {
-        if (futureValue === void 0)
-          futureValue = null;
-        let result = new _Future();
-        this[_onDone] = (() => {
-          result._completeWithValue(null);
-        }).bind(this);
-        return result;
-      }
-      [_sendDone]() {
-        this[_state] = ~dart.notNull(_DoneStreamSubscription._SCHEDULED);
-        if (this.isPaused)
-          return;
-        this[_state] = _DoneStreamSubscription._DONE_SENT;
-        if (this[_onDone] !== null)
-          this[_zone].runGuarded(this[_onDone]);
-      }
-    }
-    _DoneStreamSubscription._DONE_SENT = 1;
-    _DoneStreamSubscription._SCHEDULED = 2;
-    _DoneStreamSubscription._PAUSED = 4;
-    return _DoneStreamSubscription;
-  });
-  let _DoneStreamSubscription = _DoneStreamSubscription$(dart.dynamic);
-  let _source = Symbol('_source');
-  let _onListenHandler = Symbol('_onListenHandler');
-  let _onCancelHandler = Symbol('_onCancelHandler');
-  let _cancelSubscription = Symbol('_cancelSubscription');
-  let _pauseSubscription = Symbol('_pauseSubscription');
-  let _resumeSubscription = Symbol('_resumeSubscription');
-  let _isSubscriptionPaused = Symbol('_isSubscriptionPaused');
-  let _AsBroadcastStream$ = dart.generic(function(T) {
-    class _AsBroadcastStream extends Stream$(T) {
-      _AsBroadcastStream($_source, onListenHandler, onCancelHandler) {
-        this[_source] = $_source;
-        this[_onListenHandler] = dart.closureWrap(Zone.current.registerUnaryCallback(onListenHandler), "(StreamSubscription<dynamic>) → void");
-        this[_onCancelHandler] = dart.closureWrap(Zone.current.registerUnaryCallback(onCancelHandler), "(StreamSubscription<dynamic>) → void");
-        this[_zone] = Zone.current;
-        this[_controller] = null;
-        this[_subscription] = null;
-        super.Stream();
-        this[_controller] = new _AsBroadcastStreamController(this[_onListen], this[_onCancel]);
-      }
-      get isBroadcast() {
-        return true;
-      }
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        if (dart.notNull(this[_controller] === null) || dart.notNull(this[_controller].isClosed)) {
-          return new _DoneStreamSubscription(onDone);
-        }
-        if (this[_subscription] === null) {
-          this[_subscription] = this[_source].listen(this[_controller].add, {onError: this[_controller].addError, onDone: this[_controller].close});
-        }
-        cancelOnError = core.identical(true, cancelOnError);
-        return this[_controller]._subscribe(onData, onError, onDone, cancelOnError);
-      }
-      [_onCancel]() {
-        let shutdown = dart.notNull(this[_controller] === null) || dart.notNull(this[_controller].isClosed);
-        if (this[_onCancelHandler] !== null) {
-          this[_zone].runUnary(this[_onCancelHandler], new _BroadcastSubscriptionWrapper(this));
-        }
-        if (shutdown) {
-          if (this[_subscription] !== null) {
-            this[_subscription].cancel();
-            this[_subscription] = null;
-          }
-        }
-      }
-      [_onListen]() {
-        if (this[_onListenHandler] !== null) {
-          this[_zone].runUnary(this[_onListenHandler], new _BroadcastSubscriptionWrapper(this));
-        }
-      }
-      [_cancelSubscription]() {
-        if (this[_subscription] === null)
-          return;
-        let subscription = this[_subscription];
-        this[_subscription] = null;
-        this[_controller] = null;
-        subscription.cancel();
-      }
-      [_pauseSubscription](resumeSignal) {
-        if (this[_subscription] === null)
-          return;
-        this[_subscription].pause(resumeSignal);
-      }
-      [_resumeSubscription]() {
-        if (this[_subscription] === null)
-          return;
-        this[_subscription].resume();
-      }
-      get [_isSubscriptionPaused]() {
-        if (this[_subscription] === null)
-          return false;
-        return this[_subscription].isPaused;
-      }
-    }
-    return _AsBroadcastStream;
-  });
-  let _AsBroadcastStream = _AsBroadcastStream$(dart.dynamic);
-  let _BroadcastSubscriptionWrapper$ = dart.generic(function(T) {
-    class _BroadcastSubscriptionWrapper extends core.Object {
-      _BroadcastSubscriptionWrapper($_stream) {
-        this[_stream] = $_stream;
-      }
-      onData(handleData) {
-        throw new core.UnsupportedError("Cannot change handlers of asBroadcastStream source subscription.");
-      }
-      onError(handleError) {
-        throw new core.UnsupportedError("Cannot change handlers of asBroadcastStream source subscription.");
-      }
-      onDone(handleDone) {
-        throw new core.UnsupportedError("Cannot change handlers of asBroadcastStream source subscription.");
-      }
-      pause(resumeSignal) {
-        if (resumeSignal === void 0)
-          resumeSignal = null;
-        this[_stream]._pauseSubscription(resumeSignal);
-      }
-      resume() {
-        this[_stream]._resumeSubscription();
-      }
-      cancel() {
-        this[_stream]._cancelSubscription();
-        return null;
-      }
-      get isPaused() {
-        return this[_stream][_isSubscriptionPaused];
-      }
-      asFuture(futureValue) {
-        if (futureValue === void 0)
-          futureValue = null;
-        throw new core.UnsupportedError("Cannot change handlers of asBroadcastStream source subscription.");
-      }
-    }
-    return _BroadcastSubscriptionWrapper;
-  });
-  let _BroadcastSubscriptionWrapper = _BroadcastSubscriptionWrapper$(dart.dynamic);
-  let _current = Symbol('_current');
-  let _futureOrPrefetch = Symbol('_futureOrPrefetch');
-  let _clear = Symbol('_clear');
-  let _StreamIteratorImpl$ = dart.generic(function(T) {
-    class _StreamIteratorImpl extends core.Object {
-      _StreamIteratorImpl(stream) {
-        this[_subscription] = null;
-        this[_current] = null;
-        this[_futureOrPrefetch] = null;
-        this[_state] = _StreamIteratorImpl._STATE_FOUND;
-        this[_subscription] = stream.listen(this[_onData], {onError: this[_onError], onDone: this[_onDone], cancelOnError: true});
-      }
-      get current() {
-        return this[_current];
-      }
-      moveNext() {
-        if (this[_state] === _StreamIteratorImpl._STATE_DONE) {
-          return new _Future.immediate(false);
-        }
-        if (this[_state] === _StreamIteratorImpl._STATE_MOVING) {
-          throw new core.StateError("Already waiting for next.");
-        }
-        if (this[_state] === _StreamIteratorImpl._STATE_FOUND) {
-          this[_state] = _StreamIteratorImpl._STATE_MOVING;
-          this[_current] = null;
-          this[_futureOrPrefetch] = new _Future();
-          return dart.as(this[_futureOrPrefetch], Future$(core.bool));
-        } else {
-          dart.assert(dart.notNull(this[_state]) >= dart.notNull(_StreamIteratorImpl._STATE_EXTRA_DATA));
-          switch (this[_state]) {
-            case _StreamIteratorImpl._STATE_EXTRA_DATA:
-              this[_state] = _StreamIteratorImpl._STATE_FOUND;
-              this[_current] = dart.as(this[_futureOrPrefetch], T);
-              this[_futureOrPrefetch] = null;
-              this[_subscription].resume();
-              return new _Future.immediate(true);
-            case _StreamIteratorImpl._STATE_EXTRA_ERROR:
-              let prefetch = dart.as(this[_futureOrPrefetch], AsyncError);
-              this[_clear]();
-              return new _Future.immediateError(prefetch.error, prefetch.stackTrace);
-            case _StreamIteratorImpl._STATE_EXTRA_DONE:
-              this[_clear]();
-              return new _Future.immediate(false);
-          }
-        }
-      }
-      [_clear]() {
-        this[_subscription] = null;
-        this[_futureOrPrefetch] = null;
-        this[_current] = null;
-        this[_state] = _StreamIteratorImpl._STATE_DONE;
-      }
-      cancel() {
-        let subscription = this[_subscription];
-        if (this[_state] === _StreamIteratorImpl._STATE_MOVING) {
-          let hasNext = dart.as(this[_futureOrPrefetch], _Future$(core.bool));
-          this[_clear]();
-          hasNext._complete(false);
-        } else {
-          this[_clear]();
-        }
-        return subscription.cancel();
-      }
-      [_onData](data) {
-        if (this[_state] === _StreamIteratorImpl._STATE_MOVING) {
-          this[_current] = data;
-          let hasNext = dart.as(this[_futureOrPrefetch], _Future$(core.bool));
-          this[_futureOrPrefetch] = null;
-          this[_state] = _StreamIteratorImpl._STATE_FOUND;
-          hasNext._complete(true);
-          return;
-        }
-        this[_subscription].pause();
-        dart.assert(this[_futureOrPrefetch] === null);
-        this[_futureOrPrefetch] = data;
-        this[_state] = _StreamIteratorImpl._STATE_EXTRA_DATA;
-      }
-      [_onError](error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        if (this[_state] === _StreamIteratorImpl._STATE_MOVING) {
-          let hasNext = dart.as(this[_futureOrPrefetch], _Future$(core.bool));
-          this[_clear]();
-          hasNext._completeError(error, stackTrace);
-          return;
-        }
-        this[_subscription].pause();
-        dart.assert(this[_futureOrPrefetch] === null);
-        this[_futureOrPrefetch] = new AsyncError(error, stackTrace);
-        this[_state] = _StreamIteratorImpl._STATE_EXTRA_ERROR;
-      }
-      [_onDone]() {
-        if (this[_state] === _StreamIteratorImpl._STATE_MOVING) {
-          let hasNext = dart.as(this[_futureOrPrefetch], _Future$(core.bool));
-          this[_clear]();
-          hasNext._complete(false);
-          return;
-        }
-        this[_subscription].pause();
-        this[_futureOrPrefetch] = null;
-        this[_state] = _StreamIteratorImpl._STATE_EXTRA_DONE;
-      }
-    }
-    _StreamIteratorImpl._STATE_FOUND = 0;
-    _StreamIteratorImpl._STATE_DONE = 1;
-    _StreamIteratorImpl._STATE_MOVING = 2;
-    _StreamIteratorImpl._STATE_EXTRA_DATA = 3;
-    _StreamIteratorImpl._STATE_EXTRA_ERROR = 4;
-    _StreamIteratorImpl._STATE_EXTRA_DONE = 5;
-    return _StreamIteratorImpl;
-  });
-  let _StreamIteratorImpl = _StreamIteratorImpl$(dart.dynamic);
-  // Function _runUserCode: (() → dynamic, (dynamic) → dynamic, (dynamic, StackTrace) → dynamic) → dynamic
-  function _runUserCode(userCode, onSuccess, onError) {
-    try {
-      dart.dinvokef(onSuccess, userCode());
-    } catch (e) {
-      let s = dart.stackTrace(e);
-      let replacement = Zone.current.errorCallback(e, s);
-      if (replacement === null) {
-        dart.dinvokef(onError, e, s);
-      } else {
-        let error = _nonNullError(replacement.error);
-        let stackTrace = replacement.stackTrace;
-        dart.dinvokef(onError, error, stackTrace);
-      }
-    }
-
-  }
-  // Function _cancelAndError: (StreamSubscription<dynamic>, _Future<dynamic>, dynamic, StackTrace) → void
-  function _cancelAndError(subscription, future, error, stackTrace) {
-    let cancelFuture = subscription.cancel();
-    if (dart.is(cancelFuture, Future)) {
-      cancelFuture.whenComplete(() => future._completeError(error, stackTrace));
-    } else {
-      future._completeError(error, stackTrace);
-    }
-  }
-  // Function _cancelAndErrorWithReplacement: (StreamSubscription<dynamic>, _Future<dynamic>, dynamic, StackTrace) → void
-  function _cancelAndErrorWithReplacement(subscription, future, error, stackTrace) {
-    let replacement = Zone.current.errorCallback(error, stackTrace);
-    if (replacement !== null) {
-      error = _nonNullError(replacement.error);
-      stackTrace = replacement.stackTrace;
-    }
-    _cancelAndError(subscription, future, error, stackTrace);
-  }
-  // Function _cancelAndErrorClosure: (StreamSubscription<dynamic>, _Future<dynamic>) → dynamic
-  function _cancelAndErrorClosure(subscription, future) {
-    return (error, stackTrace) => _cancelAndError(subscription, future, error, stackTrace);
-  }
-  // Function _cancelAndValue: (StreamSubscription<dynamic>, _Future<dynamic>, dynamic) → void
-  function _cancelAndValue(subscription, future, value) {
-    let cancelFuture = subscription.cancel();
-    if (dart.is(cancelFuture, Future)) {
-      cancelFuture.whenComplete(() => future._complete(value));
-    } else {
-      future._complete(value);
-    }
-  }
-  let _handleData = Symbol('_handleData');
-  let _handleError = Symbol('_handleError');
-  let _handleDone = Symbol('_handleDone');
-  let _ForwardingStream$ = dart.generic(function(S, T) {
-    class _ForwardingStream extends Stream$(T) {
-      _ForwardingStream($_source) {
-        this[_source] = $_source;
-        super.Stream();
-      }
-      get isBroadcast() {
-        return this[_source].isBroadcast;
-      }
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        cancelOnError = core.identical(true, cancelOnError);
-        return this[_createSubscription](onData, onError, onDone, cancelOnError);
-      }
-      [_createSubscription](onData, onError, onDone, cancelOnError) {
-        return new _ForwardingStreamSubscription(this, onData, onError, onDone, cancelOnError);
-      }
-      [_handleData](data, sink) {
-        let outputData = data;
-        sink._add(outputData);
-      }
-      [_handleError](error, stackTrace, sink) {
-        sink._addError(error, stackTrace);
-      }
-      [_handleDone](sink) {
-        sink._close();
-      }
-    }
-    return _ForwardingStream;
-  });
-  let _ForwardingStream = _ForwardingStream$(dart.dynamic, dart.dynamic);
-  let _ForwardingStreamSubscription$ = dart.generic(function(S, T) {
-    class _ForwardingStreamSubscription extends _BufferingStreamSubscription$(T) {
-      _ForwardingStreamSubscription($_stream, onData, onError, onDone, cancelOnError) {
-        this[_stream] = $_stream;
-        this[_subscription] = null;
-        super._BufferingStreamSubscription(onData, onError, onDone, cancelOnError);
-        this[_subscription] = this[_stream][_source].listen(this[_handleData], {onError: this[_handleError], onDone: this[_handleDone]});
-      }
-      [_add](data) {
-        if (this[_isClosed])
-          return;
-        super._add(data);
-      }
-      [_addError](error, stackTrace) {
-        if (this[_isClosed])
-          return;
-        super._addError(error, stackTrace);
-      }
-      [_onPause]() {
-        if (this[_subscription] === null)
-          return;
-        this[_subscription].pause();
-      }
-      [_onResume]() {
-        if (this[_subscription] === null)
-          return;
-        this[_subscription].resume();
-      }
-      [_onCancel]() {
-        if (this[_subscription] !== null) {
-          let subscription = this[_subscription];
-          this[_subscription] = null;
-          subscription.cancel();
-        }
-        return null;
-      }
-      [_handleData](data) {
-        this[_stream]._handleData(data, this);
-      }
-      [_handleError](error, stackTrace) {
-        this[_stream]._handleError(error, stackTrace, this);
-      }
-      [_handleDone]() {
-        this[_stream]._handleDone(this);
-      }
-    }
-    return _ForwardingStreamSubscription;
-  });
-  let _ForwardingStreamSubscription = _ForwardingStreamSubscription$(dart.dynamic, dart.dynamic);
-  // Function _addErrorWithReplacement: (_EventSink<dynamic>, dynamic, dynamic) → void
-  function _addErrorWithReplacement(sink, error, stackTrace) {
-    let replacement = Zone.current.errorCallback(error, dart.as(stackTrace, core.StackTrace));
-    if (replacement !== null) {
-      error = _nonNullError(replacement.error);
-      stackTrace = replacement.stackTrace;
-    }
-    sink._addError(error, dart.as(stackTrace, core.StackTrace));
-  }
-  let _test = Symbol('_test');
-  let _WhereStream$ = dart.generic(function(T) {
-    class _WhereStream extends _ForwardingStream$(T, T) {
-      _WhereStream(source, test) {
-        this[_test] = test;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        let satisfies = null;
-        try {
-          satisfies = this[_test](inputEvent);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          _addErrorWithReplacement(sink, e, s);
-          return;
-        }
-
-        if (satisfies) {
-          sink._add(inputEvent);
-        }
-      }
-    }
-    return _WhereStream;
-  });
-  let _WhereStream = _WhereStream$(dart.dynamic);
-  let _transform = Symbol('_transform');
-  let _MapStream$ = dart.generic(function(S, T) {
-    class _MapStream extends _ForwardingStream$(S, T) {
-      _MapStream(source, transform) {
-        this[_transform] = transform;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        let outputEvent = null;
-        try {
-          outputEvent = dart.as(dart.dinvokef(this[_transform], inputEvent), T);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          _addErrorWithReplacement(sink, e, s);
-          return;
-        }
-
-        sink._add(outputEvent);
-      }
-    }
-    return _MapStream;
-  });
-  let _MapStream = _MapStream$(dart.dynamic, dart.dynamic);
-  let _expand = Symbol('_expand');
-  let _ExpandStream$ = dart.generic(function(S, T) {
-    class _ExpandStream extends _ForwardingStream$(S, T) {
-      _ExpandStream(source, expand) {
-        this[_expand] = expand;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        try {
-          for (let value of this[_expand](inputEvent)) {
-            sink._add(value);
-          }
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          _addErrorWithReplacement(sink, e, s);
-        }
-
-      }
-    }
-    return _ExpandStream;
-  });
-  let _ExpandStream = _ExpandStream$(dart.dynamic, dart.dynamic);
-  let _HandleErrorStream$ = dart.generic(function(T) {
-    class _HandleErrorStream extends _ForwardingStream$(T, T) {
-      _HandleErrorStream(source, onError, test) {
-        this[_transform] = onError;
-        this[_test] = test;
-        super._ForwardingStream(source);
-      }
-      [_handleError](error, stackTrace, sink) {
-        let matches = true;
-        if (this[_test] !== null) {
-          try {
-            matches = dart.dinvokef(this[_test], error);
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _addErrorWithReplacement(sink, e, s);
-            return;
-          }
-
-        }
-        if (matches) {
-          try {
-            _invokeErrorHandler(this[_transform], error, stackTrace);
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            if (core.identical(e, error)) {
-              sink._addError(error, stackTrace);
-            } else {
-              _addErrorWithReplacement(sink, e, s);
-            }
-            return;
-          }
-
-        } else {
-          sink._addError(error, stackTrace);
-        }
-      }
-    }
-    return _HandleErrorStream;
-  });
-  let _HandleErrorStream = _HandleErrorStream$(dart.dynamic);
-  let _remaining = Symbol('_remaining');
-  let _TakeStream$ = dart.generic(function(T) {
-    class _TakeStream extends _ForwardingStream$(T, T) {
-      _TakeStream(source, count) {
-        this[_remaining] = count;
-        super._ForwardingStream(source);
-        if (!(typeof count == number))
-          throw new core.ArgumentError(count);
-      }
-      [_handleData](inputEvent, sink) {
-        if (dart.notNull(this[_remaining]) > 0) {
-          sink._add(inputEvent);
-          this[_remaining] = 1;
-          if (this[_remaining] === 0) {
-            sink._close();
-          }
-        }
-      }
-    }
-    return _TakeStream;
-  });
-  let _TakeStream = _TakeStream$(dart.dynamic);
-  let _TakeWhileStream$ = dart.generic(function(T) {
-    class _TakeWhileStream extends _ForwardingStream$(T, T) {
-      _TakeWhileStream(source, test) {
-        this[_test] = test;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        let satisfies = null;
-        try {
-          satisfies = this[_test](inputEvent);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          _addErrorWithReplacement(sink, e, s);
-          sink._close();
-          return;
-        }
-
-        if (satisfies) {
-          sink._add(inputEvent);
-        } else {
-          sink._close();
-        }
-      }
-    }
-    return _TakeWhileStream;
-  });
-  let _TakeWhileStream = _TakeWhileStream$(dart.dynamic);
-  let _SkipStream$ = dart.generic(function(T) {
-    class _SkipStream extends _ForwardingStream$(T, T) {
-      _SkipStream(source, count) {
-        this[_remaining] = count;
-        super._ForwardingStream(source);
-        if (dart.notNull(!(typeof count == number)) || dart.notNull(count) < 0)
-          throw new core.ArgumentError(count);
-      }
-      [_handleData](inputEvent, sink) {
-        if (dart.notNull(this[_remaining]) > 0) {
-          this[_remaining] = dart.notNull(this[_remaining]) - 1;
-          return;
-        }
-        sink._add(inputEvent);
-      }
-    }
-    return _SkipStream;
-  });
-  let _SkipStream = _SkipStream$(dart.dynamic);
-  let _hasFailed = Symbol('_hasFailed');
-  let _SkipWhileStream$ = dart.generic(function(T) {
-    class _SkipWhileStream extends _ForwardingStream$(T, T) {
-      _SkipWhileStream(source, test) {
-        this[_test] = test;
-        this[_hasFailed] = false;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        if (this[_hasFailed]) {
-          sink._add(inputEvent);
-          return;
-        }
-        let satisfies = null;
-        try {
-          satisfies = this[_test](inputEvent);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          _addErrorWithReplacement(sink, e, s);
-          this[_hasFailed] = true;
-          return;
-        }
-
-        if (!dart.notNull(satisfies)) {
-          this[_hasFailed] = true;
-          sink._add(inputEvent);
-        }
-      }
-    }
-    return _SkipWhileStream;
-  });
-  let _SkipWhileStream = _SkipWhileStream$(dart.dynamic);
-  let _equals = Symbol('_equals');
-  let _DistinctStream$ = dart.generic(function(T) {
-    class _DistinctStream extends _ForwardingStream$(T, T) {
-      _DistinctStream(source, equals) {
-        this[_previous] = _SENTINEL;
-        this[_equals] = equals;
-        super._ForwardingStream(source);
-      }
-      [_handleData](inputEvent, sink) {
-        if (core.identical(this[_previous], _SENTINEL)) {
-          this[_previous] = inputEvent;
-          return sink._add(inputEvent);
-        } else {
-          let isEqual = null;
-          try {
-            if (this[_equals] === null) {
-              isEqual = dart.equals(this[_previous], inputEvent);
-            } else {
-              isEqual = this[_equals](dart.as(this[_previous], T), inputEvent);
-            }
-          } catch (e) {
-            let s = dart.stackTrace(e);
-            _addErrorWithReplacement(sink, e, s);
-            return null;
-          }
-
-          if (!dart.notNull(isEqual)) {
-            sink._add(inputEvent);
-            this[_previous] = inputEvent;
-          }
-        }
-      }
-    }
-    dart.defineLazyProperties(_DistinctStream, {
-      get _SENTINEL() {
-        return new core.Object();
-      },
-      set _SENTINEL(_) {}
-    });
-    return _DistinctStream;
-  });
-  let _DistinctStream = _DistinctStream$(dart.dynamic);
-  let _EventSinkWrapper$ = dart.generic(function(T) {
-    class _EventSinkWrapper extends core.Object {
-      _EventSinkWrapper($_sink) {
-        this[_sink] = $_sink;
-      }
-      add(data) {
-        this[_sink]._add(data);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        this[_sink]._addError(error, stackTrace);
-      }
-      close() {
-        this[_sink]._close();
-      }
-    }
-    return _EventSinkWrapper;
-  });
-  let _EventSinkWrapper = _EventSinkWrapper$(dart.dynamic);
-  let _transformerSink = Symbol('_transformerSink');
-  let _isSubscribed = Symbol('_isSubscribed');
-  let _SinkTransformerStreamSubscription$ = dart.generic(function(S, T) {
-    class _SinkTransformerStreamSubscription extends _BufferingStreamSubscription$(T) {
-      _SinkTransformerStreamSubscription(source, mapper, onData, onError, onDone, cancelOnError) {
-        this[_transformerSink] = null;
-        this[_subscription] = null;
-        super._BufferingStreamSubscription(onData, onError, onDone, cancelOnError);
-        let eventSink = new _EventSinkWrapper(this);
-        this[_transformerSink] = mapper(eventSink);
-        this[_subscription] = source.listen(this[_handleData], {onError: this[_handleError], onDone: this[_handleDone]});
-      }
-      get [_isSubscribed]() {
-        return this[_subscription] !== null;
-      }
-      [_add](data) {
-        if (this[_isClosed]) {
-          throw new core.StateError("Stream is already closed");
-        }
-        super._add(data);
-      }
-      [_addError](error, stackTrace) {
-        if (this[_isClosed]) {
-          throw new core.StateError("Stream is already closed");
-        }
-        super._addError(error, stackTrace);
-      }
-      [_close]() {
-        if (this[_isClosed]) {
-          throw new core.StateError("Stream is already closed");
-        }
-        super._close();
-      }
-      [_onPause]() {
-        if (this[_isSubscribed])
-          this[_subscription].pause();
-      }
-      [_onResume]() {
-        if (this[_isSubscribed])
-          this[_subscription].resume();
-      }
-      [_onCancel]() {
-        if (this[_isSubscribed]) {
-          let subscription = this[_subscription];
-          this[_subscription] = null;
-          subscription.cancel();
-        }
-        return null;
-      }
-      [_handleData](data) {
-        try {
-          this[_transformerSink].add(data);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          this[_addError](e, s);
-        }
-
-      }
-      [_handleError](error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        try {
-          this[_transformerSink].addError(error, dart.as(stackTrace, core.StackTrace));
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          if (core.identical(e, error)) {
-            this[_addError](error, dart.as(stackTrace, core.StackTrace));
-          } else {
-            this[_addError](e, s);
-          }
-        }
-
-      }
-      [_handleDone]() {
-        try {
-          this[_subscription] = null;
-          this[_transformerSink].close();
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          this[_addError](e, s);
-        }
-
-      }
-    }
-    return _SinkTransformerStreamSubscription;
-  });
-  let _SinkTransformerStreamSubscription = _SinkTransformerStreamSubscription$(dart.dynamic, dart.dynamic);
-  let _sinkMapper = Symbol('_sinkMapper');
-  let _StreamSinkTransformer$ = dart.generic(function(S, T) {
-    class _StreamSinkTransformer extends core.Object {
-      _StreamSinkTransformer($_sinkMapper) {
-        this[_sinkMapper] = $_sinkMapper;
-      }
-      bind(stream) {
-        return new _BoundSinkStream(stream, this[_sinkMapper]);
-      }
-    }
-    return _StreamSinkTransformer;
-  });
-  let _StreamSinkTransformer = _StreamSinkTransformer$(dart.dynamic, dart.dynamic);
-  let _BoundSinkStream$ = dart.generic(function(S, T) {
-    class _BoundSinkStream extends Stream$(T) {
-      get isBroadcast() {
-        return this[_stream].isBroadcast;
-      }
-      _BoundSinkStream($_stream, $_sinkMapper) {
-        this[_stream] = $_stream;
-        this[_sinkMapper] = $_sinkMapper;
-        super.Stream();
-      }
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        cancelOnError = core.identical(true, cancelOnError);
-        let subscription = dart.as(new _SinkTransformerStreamSubscription(this[_stream], dart.closureWrap(this[_sinkMapper], "(EventSink<dynamic>) → EventSink"), onData, onError, onDone, cancelOnError), StreamSubscription$(T));
-        return subscription;
-      }
-    }
-    return _BoundSinkStream;
-  });
-  let _BoundSinkStream = _BoundSinkStream$(dart.dynamic, dart.dynamic);
-  let _HandlerEventSink$ = dart.generic(function(S, T) {
-    class _HandlerEventSink extends core.Object {
-      _HandlerEventSink($_handleData, $_handleError, $_handleDone, $_sink) {
-        this[_handleData] = $_handleData;
-        this[_handleError] = $_handleError;
-        this[_handleDone] = $_handleDone;
-        this[_sink] = $_sink;
-      }
-      add(data) {
-        return this[_handleData](data, this[_sink]);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        return this[_handleError](error, stackTrace, this[_sink]);
-      }
-      close() {
-        return this[_handleDone](this[_sink]);
-      }
-    }
-    return _HandlerEventSink;
-  });
-  let _HandlerEventSink = _HandlerEventSink$(dart.dynamic, dart.dynamic);
-  let _defaultHandleData = Symbol('_defaultHandleData');
-  let _defaultHandleError = Symbol('_defaultHandleError');
-  let _defaultHandleDone = Symbol('_defaultHandleDone');
-  let _StreamHandlerTransformer$ = dart.generic(function(S, T) {
-    class _StreamHandlerTransformer extends _StreamSinkTransformer$(S, T) {
-      _StreamHandlerTransformer(opt$) {
-        let handleData = opt$.handleData === void 0 ? null : opt$.handleData;
-        let handleError = opt$.handleError === void 0 ? null : opt$.handleError;
-        let handleDone = opt$.handleDone === void 0 ? null : opt$.handleDone;
-        super._StreamSinkTransformer(dart.closureWrap((outputSink) => {
-          if (handleData === null)
-            handleData = dart.closureWrap(_defaultHandleData, "(S, EventSink<T>) → void");
-          if (handleError === null)
-            handleError = dart.closureWrap(_defaultHandleError, "(Object, StackTrace, EventSink<T>) → void");
-          if (handleDone === null)
-            handleDone = _defaultHandleDone;
-          return new _HandlerEventSink(handleData, handleError, handleDone, outputSink);
-        }, "(EventSink<T>) → EventSink<S>"));
-      }
-      bind(stream) {
-        return super.bind(stream);
-      }
-      static [_defaultHandleData](data, sink) {
-        sink.add(data);
-      }
-      static [_defaultHandleError](error, stackTrace, sink) {
-        sink.addError(error);
-      }
-      static [_defaultHandleDone](sink) {
-        sink.close();
-      }
-    }
-    return _StreamHandlerTransformer;
-  });
-  let _StreamHandlerTransformer = _StreamHandlerTransformer$(dart.dynamic, dart.dynamic);
-  let _transformer = Symbol('_transformer');
-  let _StreamSubscriptionTransformer$ = dart.generic(function(S, T) {
-    class _StreamSubscriptionTransformer extends core.Object {
-      _StreamSubscriptionTransformer($_transformer) {
-        this[_transformer] = $_transformer;
-      }
-      bind(stream) {
-        return new _BoundSubscriptionStream(stream, this[_transformer]);
-      }
-    }
-    return _StreamSubscriptionTransformer;
-  });
-  let _StreamSubscriptionTransformer = _StreamSubscriptionTransformer$(dart.dynamic, dart.dynamic);
-  let _BoundSubscriptionStream$ = dart.generic(function(S, T) {
-    class _BoundSubscriptionStream extends Stream$(T) {
-      _BoundSubscriptionStream($_stream, $_transformer) {
-        this[_stream] = $_stream;
-        this[_transformer] = $_transformer;
-        super.Stream();
-      }
-      listen(onData, opt$) {
-        let onError = opt$.onError === void 0 ? null : opt$.onError;
-        let onDone = opt$.onDone === void 0 ? null : opt$.onDone;
-        let cancelOnError = opt$.cancelOnError === void 0 ? null : opt$.cancelOnError;
-        cancelOnError = core.identical(true, cancelOnError);
-        let result = this[_transformer](this[_stream], cancelOnError);
-        result.onData(onData);
-        result.onError(onError);
-        result.onDone(onDone);
-        return result;
-      }
-    }
-    return _BoundSubscriptionStream;
-  });
-  let _BoundSubscriptionStream = _BoundSubscriptionStream$(dart.dynamic, dart.dynamic);
-  let _createTimer = Symbol('_createTimer');
-  let _createPeriodicTimer = Symbol('_createPeriodicTimer');
-  class Timer extends core.Object {
-    Timer(duration, callback) {
-      if (dart.equals(Zone.current, Zone.ROOT)) {
-        return Zone.current.createTimer(duration, callback);
-      }
-      return Zone.current.createTimer(duration, Zone.current.bindCallback(callback, {runGuarded: true}));
-    }
-    Timer$periodic(duration, callback) {
-      if (dart.equals(Zone.current, Zone.ROOT)) {
-        return Zone.current.createPeriodicTimer(duration, callback);
-      }
-      return Zone.current.createPeriodicTimer(duration, dart.closureWrap(Zone.current.bindUnaryCallback(callback, {runGuarded: true}), "(Timer) → void"));
-    }
-    static run(callback) {
-      new Timer(core.Duration.ZERO, callback);
-    }
-    static [_createTimer](duration, callback) {
-      let milliseconds = duration.inMilliseconds;
-      if (dart.notNull(milliseconds) < 0)
-        milliseconds = 0;
-      return new _isolate_helper.TimerImpl(milliseconds, callback);
-    }
-    static [_createPeriodicTimer](duration, callback) {
-      let milliseconds = duration.inMilliseconds;
-      if (dart.notNull(milliseconds) < 0)
-        milliseconds = 0;
-      return new _isolate_helper.TimerImpl.periodic(milliseconds, callback);
-    }
-  }
-  dart.defineNamedConstructor(Timer, 'periodic');
-  class _ZoneFunction extends core.Object {
-    _ZoneFunction(zone, function) {
-      this.zone = zone;
-      this['function'] = function;
-    }
-  }
-  class ZoneSpecification extends core.Object {
-    ZoneSpecification(opt$) {
-      return new _ZoneSpecification(opt$);
-    }
-    ZoneSpecification$from(other, opt$) {
-      let handleUncaughtError = opt$.handleUncaughtError === void 0 ? null : opt$.handleUncaughtError;
-      let run = opt$.run === void 0 ? null : opt$.run;
-      let runUnary = opt$.runUnary === void 0 ? null : opt$.runUnary;
-      let runBinary = opt$.runBinary === void 0 ? null : opt$.runBinary;
-      let registerCallback = opt$.registerCallback === void 0 ? null : opt$.registerCallback;
-      let registerUnaryCallback = opt$.registerUnaryCallback === void 0 ? null : opt$.registerUnaryCallback;
-      let registerBinaryCallback = opt$.registerBinaryCallback === void 0 ? null : opt$.registerBinaryCallback;
-      let errorCallback = opt$.errorCallback === void 0 ? null : opt$.errorCallback;
-      let scheduleMicrotask = opt$.scheduleMicrotask === void 0 ? null : opt$.scheduleMicrotask;
-      let createTimer = opt$.createTimer === void 0 ? null : opt$.createTimer;
-      let createPeriodicTimer = opt$.createPeriodicTimer === void 0 ? null : opt$.createPeriodicTimer;
-      let print = opt$.print === void 0 ? null : opt$.print;
-      let fork = opt$.fork === void 0 ? null : opt$.fork;
-      return new ZoneSpecification({handleUncaughtError: dart.as(handleUncaughtError !== null ? handleUncaughtError : other.handleUncaughtError, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, dynamic, StackTrace) → dynamic")), run: dart.as(run !== null ? run : other.run, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → dynamic")), runUnary: dart.as(runUnary !== null ? runUnary : other.runUnary, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic) → dynamic, dynamic) → dynamic")), runBinary: dart.as(runBinary !== null ? runBinary : other.runBinary, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic, dynamic, dynamic) → dynamic")), registerCallback: dart.as(registerCallback !== null ? registerCallback : other.registerCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → ZoneCallback")), registerUnaryCallback: dart.as(registerUnaryCallback !== null ? registerUnaryCallback : other.registerUnaryCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic) → dynamic) → ZoneUnaryCallback")), registerBinaryCallback: dart.as(registerBinaryCallback !== null ? registerBinaryCallback : other.registerBinaryCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic) → ZoneBinaryCallback")), errorCallback: dart.as(errorCallback !== null ? errorCallback : other.errorCallback, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Object, StackTrace) → AsyncError")), scheduleMicrotask: dart.as(scheduleMicrotask !== null ? scheduleMicrotask : other.scheduleMicrotask, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, () → dynamic) → void")), createTimer: dart.as(createTimer !== null ? createTimer : other.createTimer, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Duration, () → void) → Timer")), createPeriodicTimer: dart.as(createPeriodicTimer !== null ? createPeriodicTimer : other.createPeriodicTimer, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, Duration, (Timer) → void) → Timer")), print: dart.as(print !== null ? print : other.print, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, String) → void")), fork: dart.as(fork !== null ? fork : other.fork, dart.throw_("Unimplemented type (Zone, ZoneDelegate, Zone, ZoneSpecification, Map<dynamic, dynamic>) → Zone"))});
-    }
-  }
-  dart.defineNamedConstructor(ZoneSpecification, 'from');
-  class _ZoneSpecification extends core.Object {
-    _ZoneSpecification(opt$) {
-      let handleUncaughtError = opt$.handleUncaughtError === void 0 ? null : opt$.handleUncaughtError;
-      let run = opt$.run === void 0 ? null : opt$.run;
-      let runUnary = opt$.runUnary === void 0 ? null : opt$.runUnary;
-      let runBinary = opt$.runBinary === void 0 ? null : opt$.runBinary;
-      let registerCallback = opt$.registerCallback === void 0 ? null : opt$.registerCallback;
-      let registerUnaryCallback = opt$.registerUnaryCallback === void 0 ? null : opt$.registerUnaryCallback;
-      let registerBinaryCallback = opt$.registerBinaryCallback === void 0 ? null : opt$.registerBinaryCallback;
-      let errorCallback = opt$.errorCallback === void 0 ? null : opt$.errorCallback;
-      let scheduleMicrotask = opt$.scheduleMicrotask === void 0 ? null : opt$.scheduleMicrotask;
-      let createTimer = opt$.createTimer === void 0 ? null : opt$.createTimer;
-      let createPeriodicTimer = opt$.createPeriodicTimer === void 0 ? null : opt$.createPeriodicTimer;
-      let print = opt$.print === void 0 ? null : opt$.print;
-      let fork = opt$.fork === void 0 ? null : opt$.fork;
-      this.handleUncaughtError = handleUncaughtError;
-      this.run = run;
-      this.runUnary = runUnary;
-      this.runBinary = runBinary;
-      this.registerCallback = registerCallback;
-      this.registerUnaryCallback = registerUnaryCallback;
-      this.registerBinaryCallback = registerBinaryCallback;
-      this.errorCallback = errorCallback;
-      this.scheduleMicrotask = scheduleMicrotask;
-      this.createTimer = createTimer;
-      this.createPeriodicTimer = createPeriodicTimer;
-      this.print = print;
-      this.fork = fork;
-    }
-  }
-  class ZoneDelegate extends core.Object {
-  }
-  let _enter = Symbol('_enter');
-  let _leave = Symbol('_leave');
-  class Zone extends core.Object {
-    Zone$_() {
-    }
-    static get current() {
-      return _current;
-    }
-    static [_enter](zone) {
-      dart.assert(zone !== null);
-      dart.assert(!dart.notNull(core.identical(zone, _current)));
-      let previous = _current;
-      _current = zone;
-      return previous;
-    }
-    static [_leave](previous) {
-      dart.assert(previous !== null);
-      Zone[_current] = previous;
-    }
-  }
-  dart.defineNamedConstructor(Zone, '_');
-  Zone.ROOT = _ROOT_ZONE;
-  Zone._current = _ROOT_ZONE;
-  let _delegate = Symbol('_delegate');
-  // Function _parentDelegate: (_Zone) → ZoneDelegate
-  function _parentDelegate(zone) {
-    if (zone.parent === null)
-      return null;
-    return zone.parent[_delegate];
-  }
-  let _delegationTarget = Symbol('_delegationTarget');
-  let _handleUncaughtError = Symbol('_handleUncaughtError');
-  let _run = Symbol('_run');
-  let _runUnary = Symbol('_runUnary');
-  let _runBinary = Symbol('_runBinary');
-  let _registerCallback = Symbol('_registerCallback');
-  let _registerUnaryCallback = Symbol('_registerUnaryCallback');
-  let _registerBinaryCallback = Symbol('_registerBinaryCallback');
-  let _errorCallback = Symbol('_errorCallback');
-  let _scheduleMicrotask = Symbol('_scheduleMicrotask');
-  let _print = Symbol('_print');
-  let _fork = Symbol('_fork');
-  class _ZoneDelegate extends core.Object {
-    _ZoneDelegate($_delegationTarget) {
-      this[_delegationTarget] = $_delegationTarget;
-    }
-    handleUncaughtError(zone, error, stackTrace) {
-      let implementation = this[_delegationTarget][_handleUncaughtError];
-      let implZone = implementation.zone;
-      return dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, error, stackTrace);
-    }
-    run(zone, f) {
-      let implementation = this[_delegationTarget][_run];
-      let implZone = implementation.zone;
-      return dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f);
-    }
-    runUnary(zone, f, arg) {
-      let implementation = this[_delegationTarget][_runUnary];
-      let implZone = implementation.zone;
-      return dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f, arg);
-    }
-    runBinary(zone, f, arg1, arg2) {
-      let implementation = this[_delegationTarget][_runBinary];
-      let implZone = implementation.zone;
-      return dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f, arg1, arg2);
-    }
-    registerCallback(zone, f) {
-      let implementation = this[_delegationTarget][_registerCallback];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f), ZoneCallback);
-    }
-    registerUnaryCallback(zone, f) {
-      let implementation = this[_delegationTarget][_registerUnaryCallback];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f), ZoneUnaryCallback);
-    }
-    registerBinaryCallback(zone, f) {
-      let implementation = this[_delegationTarget][_registerBinaryCallback];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f), ZoneBinaryCallback);
-    }
-    errorCallback(zone, error, stackTrace) {
-      let implementation = this[_delegationTarget][_errorCallback];
-      let implZone = implementation.zone;
-      if (core.identical(implZone, _ROOT_ZONE))
-        return null;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, error, stackTrace), AsyncError);
-    }
-    scheduleMicrotask(zone, f) {
-      let implementation = this[_delegationTarget][_scheduleMicrotask];
-      let implZone = implementation.zone;
-      dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, f);
-    }
-    createTimer(zone, duration, f) {
-      let implementation = this[_delegationTarget][_createTimer];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, duration, f), Timer);
-    }
-    createPeriodicTimer(zone, period, f) {
-      let implementation = this[_delegationTarget][_createPeriodicTimer];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, period, f), Timer);
-    }
-    print(zone, line) {
-      let implementation = this[_delegationTarget][_print];
-      let implZone = implementation.zone;
-      dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, line);
-    }
-    fork(zone, specification, zoneValues) {
-      let implementation = this[_delegationTarget][_fork];
-      let implZone = implementation.zone;
-      return dart.as(dart.dinvokef(implementation['function'], implZone, _parentDelegate(implZone), zone, specification, zoneValues), Zone);
-    }
-  }
-  class _Zone extends core.Object {
-    _Zone() {
-    }
-    inSameErrorZone(otherZone) {
-      return dart.notNull(core.identical(this, otherZone)) || dart.notNull(core.identical(this.errorZone, otherZone.errorZone));
-    }
-  }
-  let _delegateCache = Symbol('_delegateCache');
-  let _map = Symbol('_map');
-  class _CustomZone extends _Zone {
-    get [_delegate]() {
-      if (this[_delegateCache] !== null)
-        return this[_delegateCache];
-      this[_delegateCache] = new _ZoneDelegate(this);
-      return this[_delegateCache];
-    }
-    _CustomZone(parent, specification, $_map) {
-      this.parent = parent;
-      this[_map] = $_map;
-      this[_runUnary] = null;
-      this[_run] = null;
-      this[_runBinary] = null;
-      this[_registerCallback] = null;
-      this[_registerUnaryCallback] = null;
-      this[_registerBinaryCallback] = null;
-      this[_errorCallback] = null;
-      this[_scheduleMicrotask] = null;
-      this[_createTimer] = null;
-      this[_createPeriodicTimer] = null;
-      this[_print] = null;
-      this[_fork] = null;
-      this[_handleUncaughtError] = null;
-      this[_delegateCache] = null;
-      super._Zone();
-      this[_run] = specification.run !== null ? new _ZoneFunction(this, specification.run) : this.parent[_run];
-      this[_runUnary] = specification.runUnary !== null ? new _ZoneFunction(this, specification.runUnary) : this.parent[_runUnary];
-      this[_runBinary] = specification.runBinary !== null ? new _ZoneFunction(this, specification.runBinary) : this.parent[_runBinary];
-      this[_registerCallback] = specification.registerCallback !== null ? new _ZoneFunction(this, specification.registerCallback) : this.parent[_registerCallback];
-      this[_registerUnaryCallback] = specification.registerUnaryCallback !== null ? new _ZoneFunction(this, specification.registerUnaryCallback) : this.parent[_registerUnaryCallback];
-      this[_registerBinaryCallback] = specification.registerBinaryCallback !== null ? new _ZoneFunction(this, specification.registerBinaryCallback) : this.parent[_registerBinaryCallback];
-      this[_errorCallback] = specification.errorCallback !== null ? new _ZoneFunction(this, specification.errorCallback) : this.parent[_errorCallback];
-      this[_scheduleMicrotask] = specification.scheduleMicrotask !== null ? new _ZoneFunction(this, specification.scheduleMicrotask) : this.parent[_scheduleMicrotask];
-      this[_createTimer] = specification.createTimer !== null ? new _ZoneFunction(this, specification.createTimer) : this.parent[_createTimer];
-      this[_createPeriodicTimer] = specification.createPeriodicTimer !== null ? new _ZoneFunction(this, specification.createPeriodicTimer) : this.parent[_createPeriodicTimer];
-      this[_print] = specification.print !== null ? new _ZoneFunction(this, specification.print) : this.parent[_print];
-      this[_fork] = specification.fork !== null ? new _ZoneFunction(this, specification.fork) : this.parent[_fork];
-      this[_handleUncaughtError] = specification.handleUncaughtError !== null ? new _ZoneFunction(this, specification.handleUncaughtError) : this.parent[_handleUncaughtError];
-    }
-    get errorZone() {
-      return this[_handleUncaughtError].zone;
-    }
-    runGuarded(f) {
-      try {
-        return this.run(f);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    runUnaryGuarded(f, arg) {
-      try {
-        return this.runUnary(f, arg);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    runBinaryGuarded(f, arg1, arg2) {
-      try {
-        return this.runBinary(f, arg1, arg2);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    bindCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      let registered = this.registerCallback(f);
-      if (runGuarded) {
-        return (() => this.runGuarded(registered)).bind(this);
-      } else {
-        return (() => this.run(registered)).bind(this);
-      }
-    }
-    bindUnaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      let registered = this.registerUnaryCallback(f);
-      if (runGuarded) {
-        return ((arg) => this.runUnaryGuarded(registered, arg)).bind(this);
-      } else {
-        return ((arg) => this.runUnary(registered, arg)).bind(this);
-      }
-    }
-    bindBinaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      let registered = this.registerBinaryCallback(f);
-      if (runGuarded) {
-        return ((arg1, arg2) => this.runBinaryGuarded(registered, arg1, arg2)).bind(this);
-      } else {
-        return ((arg1, arg2) => this.runBinary(registered, arg1, arg2)).bind(this);
-      }
-    }
-    get(key) {
-      let result = this[_map].get(key);
-      if (dart.notNull(result !== null) || dart.notNull(this[_map].containsKey(key)))
-        return result;
-      if (this.parent !== null) {
-        let value = this.parent.get(key);
-        if (value !== null) {
-          this[_map].set(key, value);
-        }
-        return value;
-      }
-      dart.assert(dart.equals(this, _ROOT_ZONE));
-      return null;
-    }
-    handleUncaughtError(error, stackTrace) {
-      let implementation = this[_handleUncaughtError];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, error, stackTrace);
-    }
-    fork(opt$) {
-      let specification = opt$.specification === void 0 ? null : opt$.specification;
-      let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
-      let implementation = this[_fork];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, specification, zoneValues), Zone);
-    }
-    run(f) {
-      let implementation = this[_run];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f);
-    }
-    runUnary(f, arg) {
-      let implementation = this[_runUnary];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f, arg);
-    }
-    runBinary(f, arg1, arg2) {
-      let implementation = this[_runBinary];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f, arg1, arg2);
-    }
-    registerCallback(f) {
-      let implementation = this[_registerCallback];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f), ZoneCallback);
-    }
-    registerUnaryCallback(f) {
-      let implementation = this[_registerUnaryCallback];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f), ZoneUnaryCallback);
-    }
-    registerBinaryCallback(f) {
-      let implementation = this[_registerBinaryCallback];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f), ZoneBinaryCallback);
-    }
-    errorCallback(error, stackTrace) {
-      let implementation = this[_errorCallback];
-      dart.assert(implementation !== null);
-      let implementationZone = implementation.zone;
-      if (core.identical(implementationZone, _ROOT_ZONE))
-        return null;
-      let parentDelegate = _parentDelegate(dart.as(implementationZone, _Zone));
-      return dart.as(dart.dinvokef(implementation['function'], implementationZone, parentDelegate, this, error, stackTrace), AsyncError);
-    }
-    scheduleMicrotask(f) {
-      let implementation = this[_scheduleMicrotask];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, f);
-    }
-    createTimer(duration, f) {
-      let implementation = this[_createTimer];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, duration, f), Timer);
-    }
-    createPeriodicTimer(duration, f) {
-      let implementation = this[_createPeriodicTimer];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.as(dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, duration, f), Timer);
-    }
-    print(line) {
-      let implementation = this[_print];
-      dart.assert(implementation !== null);
-      let parentDelegate = _parentDelegate(implementation.zone);
-      return dart.dinvokef(implementation['function'], implementation.zone, parentDelegate, this, line);
-    }
-  }
-  // Function _rootHandleUncaughtError: (Zone, ZoneDelegate, Zone, dynamic, StackTrace) → void
-  function _rootHandleUncaughtError(self, parent, zone, error, stackTrace) {
-    _schedulePriorityAsyncCallback(() => {
-      throw new _UncaughtAsyncError(error, stackTrace);
-    });
-  }
-  // Function _rootRun: (Zone, ZoneDelegate, Zone, () → dynamic) → dynamic
-  function _rootRun(self, parent, zone, f) {
-    if (dart.equals(Zone[_current], zone))
-      return f();
-    let old = Zone._enter(zone);
-    try {
-      return f();
-    } finally {
-      Zone._leave(old);
-    }
-  }
-  // Function _rootRunUnary: (Zone, ZoneDelegate, Zone, (dynamic) → dynamic, dynamic) → dynamic
-  function _rootRunUnary(self, parent, zone, f, arg) {
-    if (dart.equals(Zone[_current], zone))
-      return dart.dinvokef(f, arg);
-    let old = Zone._enter(zone);
-    try {
-      return dart.dinvokef(f, arg);
-    } finally {
-      Zone._leave(old);
-    }
-  }
-  // Function _rootRunBinary: (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic, dynamic, dynamic) → dynamic
-  function _rootRunBinary(self, parent, zone, f, arg1, arg2) {
-    if (dart.equals(Zone[_current], zone))
-      return dart.dinvokef(f, arg1, arg2);
-    let old = Zone._enter(zone);
-    try {
-      return dart.dinvokef(f, arg1, arg2);
-    } finally {
-      Zone._leave(old);
-    }
-  }
-  // Function _rootRegisterCallback: (Zone, ZoneDelegate, Zone, () → dynamic) → ZoneCallback
-  function _rootRegisterCallback(self, parent, zone, f) {
-    return f;
-  }
-  // Function _rootRegisterUnaryCallback: (Zone, ZoneDelegate, Zone, (dynamic) → dynamic) → ZoneUnaryCallback
-  function _rootRegisterUnaryCallback(self, parent, zone, f) {
-    return f;
-  }
-  // Function _rootRegisterBinaryCallback: (Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic) → ZoneBinaryCallback
-  function _rootRegisterBinaryCallback(self, parent, zone, f) {
-    return f;
-  }
-  // Function _rootErrorCallback: (Zone, ZoneDelegate, Zone, Object, StackTrace) → AsyncError
-  function _rootErrorCallback(self, parent, zone, error, stackTrace) {
-    return null;
-  }
-  // Function _rootScheduleMicrotask: (Zone, ZoneDelegate, Zone, () → dynamic) → void
-  function _rootScheduleMicrotask(self, parent, zone, f) {
-    if (!dart.notNull(core.identical(_ROOT_ZONE, zone))) {
-      let hasErrorHandler = !dart.notNull(_ROOT_ZONE.inSameErrorZone(zone));
-      f = zone.bindCallback(f, {runGuarded: hasErrorHandler});
-    }
-    _scheduleAsyncCallback(f);
-  }
-  // Function _rootCreateTimer: (Zone, ZoneDelegate, Zone, Duration, () → void) → Timer
-  function _rootCreateTimer(self, parent, zone, duration, callback) {
-    if (!dart.notNull(core.identical(_ROOT_ZONE, zone))) {
-      callback = zone.bindCallback(callback);
-    }
-    return Timer._createTimer(duration, callback);
-  }
-  // Function _rootCreatePeriodicTimer: (Zone, ZoneDelegate, Zone, Duration, (Timer) → void) → Timer
-  function _rootCreatePeriodicTimer(self, parent, zone, duration, callback) {
-    if (!dart.notNull(core.identical(_ROOT_ZONE, zone))) {
-      callback = dart.closureWrap(zone.bindUnaryCallback(callback), "(Timer) → void");
-    }
-    return Timer._createPeriodicTimer(duration, callback);
-  }
-  // Function _rootPrint: (Zone, ZoneDelegate, Zone, String) → void
-  function _rootPrint(self, parent, zone, line) {
-    _internal.printToConsole(line);
-  }
-  // Function _printToZone: (String) → void
-  function _printToZone(line) {
-    Zone.current.print(line);
-  }
-  // Function _rootFork: (Zone, ZoneDelegate, Zone, ZoneSpecification, Map<dynamic, dynamic>) → Zone
-  function _rootFork(self, parent, zone, specification, zoneValues) {
-    _internal.printToZone = _printToZone;
-    if (specification === null) {
-      specification = new ZoneSpecification();
-    } else if (!dart.is(specification, _ZoneSpecification)) {
-      throw new core.ArgumentError("ZoneSpecifications must be instantiated" + " with the provided constructor.");
-    }
-    let valueMap = null;
-    if (zoneValues === null) {
-      if (dart.is(zone, _Zone)) {
-        valueMap = zone[_map];
-      } else {
-        valueMap = new collection.HashMap();
-      }
-    } else {
-      valueMap = new collection.HashMap.from(zoneValues);
-    }
-    return new _CustomZone(dart.as(zone, _Zone), specification, valueMap);
-  }
-  class _RootZoneSpecification extends core.Object {
-    get handleUncaughtError() {
-      return _rootHandleUncaughtError;
-    }
-    get run() {
-      return _rootRun;
-    }
-    get runUnary() {
-      return _rootRunUnary;
-    }
-    get runBinary() {
-      return _rootRunBinary;
-    }
-    get registerCallback() {
-      return _rootRegisterCallback;
-    }
-    get registerUnaryCallback() {
-      return _rootRegisterUnaryCallback;
-    }
-    get registerBinaryCallback() {
-      return _rootRegisterBinaryCallback;
-    }
-    get errorCallback() {
-      return _rootErrorCallback;
-    }
-    get scheduleMicrotask() {
-      return _rootScheduleMicrotask;
-    }
-    get createTimer() {
-      return _rootCreateTimer;
-    }
-    get createPeriodicTimer() {
-      return _rootCreatePeriodicTimer;
-    }
-    get print() {
-      return _rootPrint;
-    }
-    get fork() {
-      return _rootFork;
-    }
-  }
-  class _RootZone extends _Zone {
-    _RootZone() {
-      super._Zone();
-    }
-    get [_run]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRun);
-    }
-    get [_runUnary]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRunUnary);
-    }
-    get [_runBinary]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRunBinary);
-    }
-    get [_registerCallback]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRegisterCallback);
-    }
-    get [_registerUnaryCallback]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRegisterUnaryCallback);
-    }
-    get [_registerBinaryCallback]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootRegisterBinaryCallback);
-    }
-    get [_errorCallback]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootErrorCallback);
-    }
-    get [_scheduleMicrotask]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootScheduleMicrotask);
-    }
-    get [_createTimer]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootCreateTimer);
-    }
-    get [_createPeriodicTimer]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootCreatePeriodicTimer);
-    }
-    get [_print]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootPrint);
-    }
-    get [_fork]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootFork);
-    }
-    get [_handleUncaughtError]() {
-      return new _ZoneFunction(_ROOT_ZONE, _rootHandleUncaughtError);
-    }
-    get parent() {
-      return null;
-    }
-    get [_map]() {
-      return _rootMap;
-    }
-    get [_delegate]() {
-      if (_rootDelegate !== null)
-        return _rootDelegate;
-      return _rootDelegate = new _ZoneDelegate(this);
-    }
-    get errorZone() {
-      return this;
-    }
-    runGuarded(f) {
-      try {
-        if (core.identical(_ROOT_ZONE, Zone[_current])) {
-          return f();
-        }
-        return _rootRun(null, null, this, f);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    runUnaryGuarded(f, arg) {
-      try {
-        if (core.identical(_ROOT_ZONE, Zone[_current])) {
-          return dart.dinvokef(f, arg);
-        }
-        return _rootRunUnary(null, null, this, f, arg);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    runBinaryGuarded(f, arg1, arg2) {
-      try {
-        if (core.identical(_ROOT_ZONE, Zone[_current])) {
-          return dart.dinvokef(f, arg1, arg2);
-        }
-        return _rootRunBinary(null, null, this, f, arg1, arg2);
-      } catch (e) {
-        let s = dart.stackTrace(e);
-        return this.handleUncaughtError(e, s);
-      }
-
-    }
-    bindCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      if (runGuarded) {
-        return (() => this.runGuarded(f)).bind(this);
-      } else {
-        return (() => this.run(f)).bind(this);
-      }
-    }
-    bindUnaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      if (runGuarded) {
-        return ((arg) => this.runUnaryGuarded(f, arg)).bind(this);
-      } else {
-        return ((arg) => this.runUnary(f, arg)).bind(this);
-      }
-    }
-    bindBinaryCallback(f, opt$) {
-      let runGuarded = opt$.runGuarded === void 0 ? true : opt$.runGuarded;
-      if (runGuarded) {
-        return ((arg1, arg2) => this.runBinaryGuarded(f, arg1, arg2)).bind(this);
-      } else {
-        return ((arg1, arg2) => this.runBinary(f, arg1, arg2)).bind(this);
-      }
-    }
-    get(key) {
-      return null;
-    }
-    handleUncaughtError(error, stackTrace) {
-      return _rootHandleUncaughtError(null, null, this, error, stackTrace);
-    }
-    fork(opt$) {
-      let specification = opt$.specification === void 0 ? null : opt$.specification;
-      let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
-      return _rootFork(null, null, this, specification, zoneValues);
-    }
-    run(f) {
-      if (core.identical(Zone[_current], _ROOT_ZONE))
-        return f();
-      return _rootRun(null, null, this, f);
-    }
-    runUnary(f, arg) {
-      if (core.identical(Zone[_current], _ROOT_ZONE))
-        return dart.dinvokef(f, arg);
-      return _rootRunUnary(null, null, this, f, arg);
-    }
-    runBinary(f, arg1, arg2) {
-      if (core.identical(Zone[_current], _ROOT_ZONE))
-        return dart.dinvokef(f, arg1, arg2);
-      return _rootRunBinary(null, null, this, f, arg1, arg2);
-    }
-    registerCallback(f) {
-      return f;
-    }
-    registerUnaryCallback(f) {
-      return f;
-    }
-    registerBinaryCallback(f) {
-      return f;
-    }
-    errorCallback(error, stackTrace) {
-      return null;
-    }
-    scheduleMicrotask(f) {
-      _rootScheduleMicrotask(null, null, this, f);
-    }
-    createTimer(duration, f) {
-      return Timer._createTimer(duration, f);
-    }
-    createPeriodicTimer(duration, f) {
-      return Timer._createPeriodicTimer(duration, f);
-    }
-    print(line) {
-      _internal.printToConsole(line);
-    }
-  }
-  _RootZone._rootDelegate = null;
-  dart.defineLazyProperties(_RootZone, {
-    get _rootMap() {
-      return new collection.HashMap();
-    },
-    set _rootMap(_) {}
-  });
-  let _ROOT_ZONE = new _RootZone();
-  // Function runZoned: (() → dynamic, {zoneValues: Map<dynamic, dynamic>, zoneSpecification: ZoneSpecification, onError: Function}) → dynamic
-  function runZoned(body, opt$) {
-    let zoneValues = opt$.zoneValues === void 0 ? null : opt$.zoneValues;
-    let zoneSpecification = opt$.zoneSpecification === void 0 ? null : opt$.zoneSpecification;
-    let onError = opt$.onError === void 0 ? null : opt$.onError;
-    let errorHandler = null;
-    if (onError !== null) {
-      errorHandler = (self, parent, zone, error, stackTrace) => {
-        try {
-          if (dart.is(onError, ZoneBinaryCallback)) {
-            return self.parent.runBinary(onError, error, stackTrace);
-          }
-          return self.parent.runUnary(dart.as(onError, dart.throw_("Unimplemented type (dynamic) → dynamic")), error);
-        } catch (e) {
-          let s = dart.stackTrace(e);
-          if (core.identical(e, error)) {
-            return parent.handleUncaughtError(zone, error, stackTrace);
-          } else {
-            return parent.handleUncaughtError(zone, e, s);
-          }
-        }
-
-      };
-    }
-    if (zoneSpecification === null) {
-      zoneSpecification = new ZoneSpecification({handleUncaughtError: errorHandler});
-    } else if (errorHandler !== null) {
-      zoneSpecification = new ZoneSpecification.from(zoneSpecification, {handleUncaughtError: errorHandler});
-    }
-    let zone = Zone.current.fork({specification: zoneSpecification, zoneValues: zoneValues});
-    if (onError !== null) {
-      return zone.runGuarded(body);
-    } else {
-      return zone.run(body);
-    }
-  }
-  dart.copyProperties(exports, {
-    get _hasDocument() {
-      return dart.equals(typeof document, 'object');
-    }
-  });
-  // Exports:
-  exports.AsyncError = AsyncError;
-  exports.Stream = Stream;
-  exports.Stream$ = Stream$;
-  exports.DeferredLibrary = DeferredLibrary;
-  exports.DeferredLoadException = DeferredLoadException;
-  exports.Future = Future;
-  exports.Future$ = Future$;
-  exports.TimeoutException = TimeoutException;
-  exports.Completer = Completer;
-  exports.Completer$ = Completer$;
-  exports.scheduleMicrotask = scheduleMicrotask;
-  exports.StreamSubscription = StreamSubscription;
-  exports.StreamSubscription$ = StreamSubscription$;
-  exports.EventSink = EventSink;
-  exports.EventSink$ = EventSink$;
-  exports.StreamView = StreamView;
-  exports.StreamView$ = StreamView$;
-  exports.StreamConsumer = StreamConsumer;
-  exports.StreamConsumer$ = StreamConsumer$;
-  exports.StreamSink = StreamSink;
-  exports.StreamSink$ = StreamSink$;
-  exports.StreamTransformer = StreamTransformer;
-  exports.StreamTransformer$ = StreamTransformer$;
-  exports.StreamIterator = StreamIterator;
-  exports.StreamIterator$ = StreamIterator$;
-  exports.StreamController = StreamController;
-  exports.StreamController$ = StreamController$;
-  exports.Timer = Timer;
-  exports.ZoneSpecification = ZoneSpecification;
-  exports.ZoneDelegate = ZoneDelegate;
-  exports.Zone = Zone;
-  exports.runZoned = runZoned;
-})(async || (async = {}));