Rationalize coercions

test/dart_codegen/expect/async/stream_controller.dart

 part of dart.async;
  abstract class StreamController<T> implements StreamSink<T> {Stream<T> get stream;
  factory StreamController({
   void onListen(), void onPause(), void onResume(), onCancel(), bool sync : false}
 ) {
   if (onListen == null && onPause == null && onResume == null && onCancel == null) {
     return ((__x82) => DEVC$RT.cast(__x82, DEVC$RT.type((_StreamController<dynamic> _) {
       }
     ), DEVC$RT.type((StreamController<T> _) {
       }
-    ), "CastDynamic", """line 83, column 14 of dart:async/stream_controller.dart: """, __x82 is StreamController<T>, false))(sync ? new _NoCallbackSyncStreamController() : new _NoCallbackAsyncStreamController());
+    ), "CompositeCast", """line 83, column 14 of dart:async/stream_controller.dart: """, __x82 is StreamController<T>, false))(sync ? new _NoCallbackSyncStreamController() : new _NoCallbackAsyncStreamController());
     }
    return sync ? new _SyncStreamController<T>(onListen, onPause, onResume, onCancel) : new _AsyncStreamController<T>(onListen, onPause, onResume, onCancel);
   }
  factory StreamController.broadcast({
   void onListen(), void onCancel(), bool sync : false}
 ) {
   return sync ? new _SyncBroadcastStreamController<T>(onListen, onCancel) : new _AsyncBroadcastStreamController<T>(onListen, onCancel);
   }
  StreamSink<T> get sink;
  bool get isClosed;
@@ skipping 22 matching lines @@
  _Future _doneFuture;
  _StreamController();
  _NotificationHandler get _onListen;
  _NotificationHandler get _onPause;
  _NotificationHandler get _onResume;
  _NotificationHandler get _onCancel;
  Stream<T> get stream => ((__x83) => DEVC$RT.cast(__x83, DEVC$RT.type((_ControllerStream<dynamic> _) {
 }
 ), DEVC$RT.type((Stream<T> _) {
 }
-), "CastExact", """line 293, column 27 of dart:async/stream_controller.dart: """, __x83 is Stream<T>, false))(new _ControllerStream(this));
+), "InferableAllocation", """line 293, column 27 of dart:async/stream_controller.dart: """, __x83 is Stream<T>, false))(new _ControllerStream(this));
  StreamSink<T> get sink => new _StreamSinkWrapper<T>(this);
  bool get _isCanceled => (_state & _STATE_CANCELED) != 0;
  bool get hasListener => (_state & _STATE_SUBSCRIBED) != 0;
  bool get _isInitialState => (_state & _STATE_SUBSCRIPTION_MASK) == _STATE_INITIAL;
  bool get isClosed => (_state & _STATE_CLOSED) != 0;
  bool get isPaused => hasListener ? _subscription._isInputPaused : !_isCanceled;
  bool get _isAddingStream => (_state & _STATE_ADDSTREAM) != 0;
  bool get _mayAddEvent => (_state < _STATE_CLOSED);
  _PendingEvents get _pendingEvents {
 assert (_isInitialState); if (!_isAddingStream) {
-return DEVC$RT.cast(_varData, dynamic, _PendingEvents, "CastGeneral", """line 334, column 14 of dart:async/stream_controller.dart: """, _varData is _PendingEvents, true);
+return DEVC$RT.cast(_varData, dynamic, _PendingEvents, "DynamicCast", """line 334, column 14 of dart:async/stream_controller.dart: """, _varData is _PendingEvents, true);
 }
  _StreamControllerAddStreamState state = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
 }
-), "CastGeneral", """line 336, column 45 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
- return DEVC$RT.cast(state.varData, dynamic, _PendingEvents, "CastGeneral", """line 337, column 12 of dart:async/stream_controller.dart: """, state.varData is _PendingEvents, true);
+), "DynamicCast", """line 336, column 45 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+ return DEVC$RT.cast(state.varData, dynamic, _PendingEvents, "DynamicCast", """line 337, column 12 of dart:async/stream_controller.dart: """, state.varData is _PendingEvents, true);
 }
  _StreamImplEvents _ensurePendingEvents() {
 assert (_isInitialState); if (!_isAddingStream) {
 if (_varData == null) _varData = new _StreamImplEvents();
- return DEVC$RT.cast(_varData, dynamic, _StreamImplEvents, "CastGeneral", """line 345, column 14 of dart:async/stream_controller.dart: """, _varData is _StreamImplEvents, true);
+ return DEVC$RT.cast(_varData, dynamic, _StreamImplEvents, "DynamicCast", """line 345, column 14 of dart:async/stream_controller.dart: """, _varData is _StreamImplEvents, true);
 }
  _StreamControllerAddStreamState state = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
 }
-), "CastGeneral", """line 347, column 45 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 347, column 45 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  if (state.varData == null) state.varData = new _StreamImplEvents();
- return DEVC$RT.cast(state.varData, dynamic, _StreamImplEvents, "CastGeneral", """line 349, column 12 of dart:async/stream_controller.dart: """, state.varData is _StreamImplEvents, true);
+ return DEVC$RT.cast(state.varData, dynamic, _StreamImplEvents, "DynamicCast", """line 349, column 12 of dart:async/stream_controller.dart: """, state.varData is _StreamImplEvents, true);
 }
  _ControllerSubscription get _subscription {
 assert (hasListener); if (_isAddingStream) {
 _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
   }
-), "CastGeneral", """line 358, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 358, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  return DEVC$RT.cast(addState.varData, dynamic, DEVC$RT.type((_ControllerSubscription<dynamic> _) {
   }
-), "CastGeneral", """line 359, column 14 of dart:async/stream_controller.dart: """, addState.varData is _ControllerSubscription<dynamic>, true);
+), "DynamicCast", """line 359, column 14 of dart:async/stream_controller.dart: """, addState.varData is _ControllerSubscription<dynamic>, true);
 }
  return DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_ControllerSubscription<dynamic> _) {
 }
-), "CastGeneral", """line 361, column 12 of dart:async/stream_controller.dart: """, _varData is _ControllerSubscription<dynamic>, true);
+), "DynamicCast", """line 361, column 12 of dart:async/stream_controller.dart: """, _varData is _ControllerSubscription<dynamic>, true);
 }
  Error _badEventState() {
 if (isClosed) {
 return new StateError("Cannot add event after closing");
 }
  assert (_isAddingStream); return new StateError("Cannot add event while adding a stream");
 }
  Future addStream(Stream<T> source, {
 bool cancelOnError : true}
 ) {
@@ skipping 54 matching lines @@
 if (hasListener) {
 _sendError(error, stackTrace);
 }
  else if (_isInitialState) {
 _ensurePendingEvents().add(new _DelayedError(error, stackTrace));
 }
 }
  void _close() {
 assert (_isAddingStream); _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
 }
-), "CastGeneral", """line 482, column 48 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 482, column 48 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  _varData = addState.varData;
  _state &= ~_STATE_ADDSTREAM;
  addState.complete();
 }
  StreamSubscription<T> _subscribe(void onData(T data), Function onError, void onDone(), bool cancelOnError) {
 if (!_isInitialState) {
 throw new StateError("Stream has already been listened to.");
 }
  _ControllerSubscription subscription = new _ControllerSubscription(this, onData, onError, onDone, cancelOnError);
  _PendingEvents pendingEvents = _pendingEvents;
  _state |= _STATE_SUBSCRIBED;
  if (_isAddingStream) {
 _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
   }
-), "CastGeneral", """line 505, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 505, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  addState.varData = subscription;
  addState.resume();
 }
  else {
 _varData = subscription;
 }
  subscription._setPendingEvents(pendingEvents);
  subscription._guardCallback(() {
 _runGuarded(_onListen);
 }
 );
  return DEVC$RT.cast(subscription, DEVC$RT.type((_ControllerSubscription<dynamic> _) {
 }
 ), DEVC$RT.type((StreamSubscription<T> _) {
 }
-), "CastDynamic", """line 516, column 12 of dart:async/stream_controller.dart: """, subscription is StreamSubscription<T>, false);
+), "CompositeCast", """line 516, column 12 of dart:async/stream_controller.dart: """, subscription is StreamSubscription<T>, false);
 }
  Future _recordCancel(StreamSubscription<T> subscription) {
 Future result;
  if (_isAddingStream) {
 _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
   }
-), "CastGeneral", """line 530, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 530, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  result = addState.cancel();
 }
  _varData = null;
  _state = (_state & ~(_STATE_SUBSCRIBED | _STATE_ADDSTREAM)) | _STATE_CANCELED;
  if (_onCancel != null) {
 if (result == null) {
   try {
     result = ((__x84) => DEVC$RT.cast(__x84, dynamic, DEVC$RT.type((Future<dynamic> _) {
       }
-    ), "CastGeneral", """line 542, column 20 of dart:async/stream_controller.dart: """, __x84 is Future<dynamic>, true))(_onCancel());
+    ), "DynamicCast", """line 542, column 20 of dart:async/stream_controller.dart: """, __x84 is Future<dynamic>, true))(_onCancel());
     }
    catch (e, s) {
     result = new _Future().._asyncCompleteError(e, s);
     }
   }
  else {
   result = result.whenComplete(_onCancel);
   }
 }
  void complete() {
 if (_doneFuture != null && _doneFuture._mayComplete) {
   _doneFuture._asyncComplete(null);
   }
 }
  if (result != null) {
 result = result.whenComplete(complete);
 }
  else {
 complete();
 }
  return result;
 }
  void _recordPause(StreamSubscription<T> subscription) {
 if (_isAddingStream) {
 _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
   }
-), "CastGeneral", """line 572, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 572, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  addState.pause();
 }
  _runGuarded(_onPause);
 }
  void _recordResume(StreamSubscription<T> subscription) {
 if (_isAddingStream) {
 _StreamControllerAddStreamState addState = DEVC$RT.cast(_varData, dynamic, DEVC$RT.type((_StreamControllerAddStreamState<dynamic> _) {
   }
-), "CastGeneral", """line 580, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
+), "DynamicCast", """line 580, column 50 of dart:async/stream_controller.dart: """, _varData is _StreamControllerAddStreamState<dynamic>, true);
  addState.resume();
 }
  _runGuarded(_onResume);
 }
 }
  abstract class _SyncStreamControllerDispatch<T> implements _StreamController<T> {void _sendData(T data) {
 _subscription._add(data);
 }
  void _sendError(Object error, StackTrace stackTrace) {
 _subscription._addError(error, stackTrace);
@@ skipping 31 matching lines @@
 }
  class _NoCallbackAsyncStreamController = _StreamController with _AsyncStreamControllerDispatch, _NoCallbacks;
  class _NoCallbackSyncStreamController = _StreamController with _SyncStreamControllerDispatch, _NoCallbacks;
  typedef _NotificationHandler();
  Future _runGuarded(_NotificationHandler notificationHandler) {
 if (notificationHandler == null) return null;
  try {
 var result = notificationHandler();
  if (result is Future) return DEVC$RT.cast(result, dynamic, DEVC$RT.type((Future<dynamic> _) {
 }
-), "CastGeneral", """line 665, column 34 of dart:async/stream_controller.dart: """, result is Future<dynamic>, true);
+), "DynamicCast", """line 665, column 34 of dart:async/stream_controller.dart: """, result is Future<dynamic>, true);
  return null;
 }
  catch (e, s) {
 Zone.current.handleUncaughtError(e, s);
 }
 }
  class _ControllerStream<T> extends _StreamImpl<T> {_StreamControllerLifecycle<T> _controller;
  _ControllerStream(this._controller);
  StreamSubscription<T> _createSubscription(void onData(T data), Function onError, void onDone(), bool cancelOnError) => _controller._subscribe(onData, onError, onDone, cancelOnError);
  int get hashCode => _controller.hashCode ^ 0x35323532;
  bool operator ==(Object other) {
 if (identical(this, other)) return true;
  if (other is! _ControllerStream) return false;
  _ControllerStream otherStream = DEVC$RT.cast(other, Object, DEVC$RT.type((_ControllerStream<dynamic> _) {
 }
-), "CastGeneral", """line 693, column 37 of dart:async/stream_controller.dart: """, other is _ControllerStream<dynamic>, true);
+), "AssignmentCast", """line 693, column 37 of dart:async/stream_controller.dart: """, other is _ControllerStream<dynamic>, true);
  return identical(otherStream._controller, this._controller);
 }
 }
  class _ControllerSubscription<T> extends _BufferingStreamSubscription<T> {final _StreamControllerLifecycle<T> _controller;
  _ControllerSubscription(this._controller, void onData(T data), Function onError, void onDone(), bool cancelOnError) : super(onData, onError, onDone, cancelOnError);
  Future _onCancel() {
 return _controller._recordCancel(this);
 }
  void _onPause() {
 _controller._recordPause(this);
@@ skipping 11 matching lines @@
 _target.addError(error, stackTrace);
 }
  Future close() => _target.close();
  Future addStream(Stream<T> source, {
 bool cancelOnError : true}
 ) => _target.addStream(source, cancelOnError: cancelOnError);
  Future get done => _target.done;
 }
  class _AddStreamState<T> {final _Future addStreamFuture;
  final StreamSubscription addSubscription;
- _AddStreamState(_EventSink<T> controller, Stream source, bool cancelOnError) : addStreamFuture = new _Future(), addSubscription = source.listen(controller._add, onError: ((__x85) => DEVC$RT.cast(__x85, dynamic, Function, "CastGeneral", """line 746, column 50 of dart:async/stream_controller.dart: """, __x85 is Function, true))(cancelOnError ? makeErrorHandler(controller) : controller._addError), onDone: controller._close, cancelOnError: cancelOnError);
+ _AddStreamState(_EventSink<T> controller, Stream source, bool cancelOnError) : addStreamFuture = new _Future(), addSubscription = source.listen(controller._add, onError: ((__x85) => DEVC$RT.cast(__x85, dynamic, Function, "DynamicCast", """line 746, column 50 of dart:async/stream_controller.dart: """, __x85 is Function, true))(cancelOnError ? makeErrorHandler(controller) : controller._addError), onDone: controller._close, cancelOnError: cancelOnError);
  static makeErrorHandler(_EventSink controller) => (e, StackTrace s) {
 controller._addError(e, s);
  controller._close();
 }
 ;
  void pause() {
 addSubscription.pause();
 }
  void resume() {
 addSubscription.resume();
@@ skipping 11 matching lines @@
 }
  void complete() {
 addStreamFuture._asyncComplete(null);
 }
 }
  class _StreamControllerAddStreamState<T> extends _AddStreamState<T> {var varData;
  _StreamControllerAddStreamState(_StreamController controller, this.varData, Stream source, bool cancelOnError) : super(DEVC$RT.cast(controller, DEVC$RT.type((_StreamController<dynamic> _) {
 }
 ), DEVC$RT.type((_EventSink<T> _) {
 }
-), "CastDynamic", """line 798, column 15 of dart:async/stream_controller.dart: """, controller is _EventSink<T>, false), source, cancelOnError) {
+), "CompositeCast", """line 798, column 15 of dart:async/stream_controller.dart: """, controller is _EventSink<T>, false), source, cancelOnError) {
 if (controller.isPaused) {
 addSubscription.pause();
 }
 }
 }