fixes #25, most analyzer errors were not computed

tool/sdk_expected_errors.txt

 severe: line 90, column 1 of dart:js: [Message] File dart:html not found
 import 'dart:html' show Blob, Event, ImageData, Node, Window;
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 severe: line 92, column 1 of dart:js: [Message] File dart:indexed_db not found
 import 'dart:indexed_db' show KeyRange;
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 426, column 16 of dart:math: [DownCastImplicit] rnd32.remainder(max) (num) will need runtime check to cast to type int
       result = rnd32.remainder(max); // % max;
                ^^^^^^^^^^^^^^^^^^^^
 warning: line 37, column 25 of dart:math/point.dart: [DownCastComposite] x + other.x (num) will need runtime check to cast to type T
@@ skipping 94 matching lines @@
             ^^^^^^^^^^^^^
 warning: line 231, column 16 of dart:math/rectangle.dart: [DownCastComposite] max(a.y, b.y) - top (num) will need runtime check to cast to type T
     T height = max(a.y, b.y) - top;
                ^^^^^^^^^^^^^^^^^^^
 warning: line 247, column 28 of dart:math/rectangle.dart: [DownCastComposite] _clampToZero(width) (num) will need runtime check to cast to type T
     if (width < 0) width = _clampToZero(width);
                            ^^^^^^^^^^^^^^^^^^^
 warning: line 263, column 30 of dart:math/rectangle.dart: [DownCastComposite] _clampToZero(height) (num) will need runtime check to cast to type T
     if (height < 0) height = _clampToZero(height);
                              ^^^^^^^^^^^^^^^^^^^^
+warning: line 29, column 45 of dart:_interceptors: [AnalyzerMessage] Classes cannot implement 'bool'
+class JSBool extends Interceptor implements bool {
+                                            ^^^^
 warning: line 80, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] JS('var', r'#.pop()', this) (dynamic) will need runtime check to cast to type E
     return JS('var', r'#.pop()', this);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 125, column 9 of dart:_interceptors/js_array.dart: [DownCastComposite] JS('', '#[#]', this, i) (dynamic) will need runtime check to cast to type E
       f(JS('', '#[#]', this, i));
         ^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 161, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] IterableMixinWorkaround.reduce(this, combine) (dynamic) will need runtime check to cast to type E
     return IterableMixinWorkaround.reduce(this, combine);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 169, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] IterableMixinWorkaround.firstWhere(this, test, orElse) (dynamic) will need runtime check to cast to type E
     return IterableMixinWorkaround.firstWhere(this, test, orElse);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 173, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] IterableMixinWorkaround.lastWhereList(this, test, orElse) (dynamic) will need runtime check to cast to type E
     return IterableMixinWorkaround.lastWhereList(this, test, orElse);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 177, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] IterableMixinWorkaround.singleWhere(this, test) (dynamic) will need runtime check to cast to type E
     return IterableMixinWorkaround.singleWhere(this, test);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 313, column 12 of dart:_interceptors/js_array.dart: [DownCastComposite] JS('var', '#[#]', this, index) (dynamic) will need runtime check to cast to type E
     return JS('var', '#[#]', this, index);
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+warning: line 349, column 46 of dart:_interceptors/js_number.dart: [AnalyzerMessage] Classes cannot implement 'double'
+class JSInt extends JSNumber implements int, double {
+                                             ^^^^^^
+severe: line 110, column 17 of dart:_interceptors/js_number.dart: [AnalyzerMessage] The return type 'JSNumber' is not a 'double', as defined by the method 'toDouble'
+  toDouble() => this;
+                ^^^^
+warning: line 349, column 41 of dart:_interceptors/js_number.dart: [AnalyzerMessage] Classes cannot implement 'int'
+class JSInt extends JSNumber implements int, double {
+                                        ^^^
+warning: line 16, column 47 of dart:_interceptors/js_number.dart: [AnalyzerMessage] Classes cannot implement 'num'
+class JSNumber extends Interceptor implements num {
+                                              ^^^
+warning: line 420, column 44 of dart:_interceptors/js_number.dart: [AnalyzerMessage] Classes cannot implement 'double'
+class JSDouble extends JSNumber implements double {
+                                           ^^^^^^
 warning: line 83, column 28 of dart:_interceptors/js_number.dart: [DownCastImplicit] JS('num', r'Math.ceil(#)', this) (num) will need runtime check to cast to type double
   double ceilToDouble() => JS('num', r'Math.ceil(#)', this);
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 85, column 29 of dart:_interceptors/js_number.dart: [DownCastImplicit] JS('num', r'Math.floor(#)', this) (num) will need runtime check to cast to type double
   double floorToDouble() => JS('num', r'Math.floor(#)', this);
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 89, column 14 of dart:_interceptors/js_number.dart: [DownCastImplicit] JS('num', r'-Math.round(-#)', this) (num) will need runtime check to cast to type double
       return JS('num', r'-Math.round(-#)', this);
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 91, column 14 of dart:_interceptors/js_number.dart: [DownCastImplicit] JS('num', r'Math.round(#)', this) (num) will need runtime check to cast to type double
@@ skipping 49 matching lines @@
                ^^^^^^^^^^^^^^^^
 severe: line 420, column 16 of dart:_interceptors/js_number.dart: [InvalidMethodOverride] Base class introduces an invalid override. The type of JSNumber.* ((num) → num) is not a subtype of double.* ((num) → double).
 class JSDouble extends JSNumber implements double {
                ^^^^^^^^^^^^^^^^
 severe: line 420, column 16 of dart:_interceptors/js_number.dart: [InvalidMethodOverride] Base class introduces an invalid override. The type of JSNumber.% ((num) → num) is not a subtype of double.% ((num) → double).
 class JSDouble extends JSNumber implements double {
                ^^^^^^^^^^^^^^^^
 severe: line 420, column 16 of dart:_interceptors/js_number.dart: [InvalidMethodOverride] Base class introduces an invalid override. The type of JSNumber.sign (() → num) is not a subtype of double.sign (() → double).
 class JSDouble extends JSNumber implements double {
                ^^^^^^^^^^^^^^^^
+warning: line 14, column 47 of dart:_interceptors/js_string.dart: [AnalyzerMessage] Classes cannot implement 'String'
+class JSString extends Interceptor implements String, JSIndexable {
+                                              ^^^^^^
 warning: line 86, column 14 of dart:_interceptors/js_string.dart: [DownCastComposite] JS('JSExtendableArray', r'#.split(#)', this, pattern) (dynamic) will need runtime check to cast to type List<String>
       return JS('JSExtendableArray', r'#.split(#)', this, pattern);
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 89, column 14 of dart:_interceptors/js_string.dart: [DownCastComposite] JS('JSExtendableArray', r'#.split(#)', this, re) (dynamic) will need runtime check to cast to type List<String>
       return JS('JSExtendableArray', r'#.split(#)', this, re);
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 severe: line 346, column 7 of dart:_interceptors/js_string.dart: [StaticTypeError] Type check failed: s += s (String) is not of type JSString
       s += s;
       ^^^^^^
 warning: line 87, column 18 of dart:_js_helper: [DownCastImplicit] JS('num', r'parseInt(#, 16)', source) (num) will need runtime check to cast to type int
@@ skipping 34 matching lines @@
                                           ^^^^^
 warning: line 137, column 23 of dart:_js_helper/string_helper.dart: [DownCastComposite] pattern.allMatches(receiver) (dynamic) will need runtime check to cast to type Iterable<Match>
   for (Match match in pattern.allMatches(receiver)) {
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 168, column 14 of dart:isolate: [DownCastComposite] IsolateNatives.spawnFunction(entryPoint, message, paused).then((msg) => new Isolate(msg[1], pauseCapability: msg[2], terminateCapability: msg[3])) (Future<dynamic>) will need runtime check to cast to type Future<Isolate>
       return IsolateNatives.spawnFunction(entryPoint, message, paused)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 234, column 14 of dart:isolate: [DownCastComposite] IsolateNatives.spawnUri(uri, args, message, paused).then((msg) => new Isolate(msg[1], pauseCapability: msg[2], terminateCapability: msg[3])) (Future<dynamic>) will need runtime check to cast to type Future<Isolate>
       return IsolateNatives.spawnUri(uri, args, message, paused)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-severe: line 452, column 28 of dart:_native_typed_data: [AnalyzerError] The getter 'length' is not defined for the class 'NativeTypedData'
+severe: line 452, column 28 of dart:_native_typed_data: [AnalyzerMessage] The getter 'length' is not defined for the class 'NativeTypedData'
         if (length == list.length) {
                            ^^^^^^
+severe: line 427, column 20 of dart:_native_typed_data: [AnalyzerMessage] The final variable 'buffer' must be initialized
+  final ByteBuffer buffer;
+                   ^^^^^^
+severe: line 24, column 13 of dart:_native_typed_data: [AnalyzerMessage] The final variable 'lengthInBytes' must be initialized
+  final int lengthInBytes;
+            ^^^^^^^^^^^^^
+severe: line 446, column 13 of dart:_native_typed_data: [AnalyzerMessage] The final variable 'elementSizeInBytes' must be initialized
+  final int elementSizeInBytes;
+            ^^^^^^^^^^^^^^^^^^
+severe: line 439, column 13 of dart:_native_typed_data: [AnalyzerMessage] The final variable 'offsetInBytes' must be initialized
+  final int offsetInBytes;
+            ^^^^^^^^^^^^^
+severe: line 433, column 13 of dart:_native_typed_data: [AnalyzerMessage] The final variable 'lengthInBytes' must be initialized
+  final int lengthInBytes;
+            ^^^^^^^^^^^^^
 warning: line 201, column 9 of dart:_native_typed_data: [DownCastImplicit] _storage.sublist(start * 4, end * 4) (List<double>) will need runtime check to cast to type NativeFloat32List
         _storage.sublist(start * 4, end * 4));
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 311, column 9 of dart:_native_typed_data: [DownCastImplicit] _storage.sublist(start * 4, end * 4) (List<int>) will need runtime check to cast to type Int32List
         _storage.sublist(start * 4, end * 4));
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 415, column 9 of dart:_native_typed_data: [DownCastImplicit] _storage.sublist(start * 2, end * 2) (List<double>) will need runtime check to cast to type NativeFloat64List
         _storage.sublist(start * 2, end * 2));
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 1106, column 12 of dart:_native_typed_data: [DownCastImplicit] length == null ? _create2(buffer, offsetInBytes) : _create3(buffer, offsetInBytes, length) (Int8List) will need runtime check to cast to type NativeInt8List
@@ skipping 31 matching lines @@
                                    ^^^^^^
 warning: line 275, column 58 of dart:_isolate_helper/isolate_serialization.dart: [DownCastImplicit] result (List<dynamic>) will need runtime check to cast to type JSArray<dynamic>
     return new JSArray.markFixed(deserializeArrayInPlace(result));
                                                          ^^^^^^
 warning: line 357, column 29 of dart:_isolate_helper/isolate_serialization.dart: [DownCastImplicit] fields (List<dynamic>) will need runtime check to cast to type JSArray<dynamic>
     deserializeArrayInPlace(fields);
                             ^^^^^^
 warning: line 20, column 39 of dart:async/async_error.dart: [DownCastImplicit] errorHandler (Function) will need runtime check to cast to type (dynamic) → dynamic
     return zone.registerUnaryCallback(errorHandler);
                                       ^^^^^^^^^^^^
-severe: line 211, column 38 of dart:async/broadcast_stream_controller.dart: [AnalyzerError] The getter '_next' is not defined for the class 'StreamSubscription<T>'
+severe: line 211, column 38 of dart:async/broadcast_stream_controller.dart: [AnalyzerMessage] The getter '_next' is not defined for the class 'StreamSubscription<T>'
       assert(!identical(subscription._next, subscription));
                                      ^^^^^
-severe: line 209, column 20 of dart:async/broadcast_stream_controller.dart: [AnalyzerError] The method '_setRemoveAfterFiring' is not defined for the class 'StreamSubscription<T>'
+severe: line 209, column 20 of dart:async/broadcast_stream_controller.dart: [AnalyzerMessage] The method '_setRemoveAfterFiring' is not defined for the class 'StreamSubscription<T>'
       subscription._setRemoveAfterFiring();
                    ^^^^^^^^^^^^^^^^^^^^^
-severe: line 207, column 36 of dart:async/broadcast_stream_controller.dart: [AnalyzerError] The getter '_next' is not defined for the class 'StreamSubscription<T>'
+severe: line 207, column 36 of dart:async/broadcast_stream_controller.dart: [AnalyzerMessage] The getter '_next' is not defined for the class 'StreamSubscription<T>'
     assert(!identical(subscription._next, subscription));
                                    ^^^^^
-severe: line 208, column 22 of dart:async/broadcast_stream_controller.dart: [AnalyzerError] The getter '_isFiring' is not defined for the class 'StreamSubscription<T>'
+severe: line 208, column 22 of dart:async/broadcast_stream_controller.dart: [AnalyzerMessage] The getter '_isFiring' is not defined for the class 'StreamSubscription<T>'
     if (subscription._isFiring) {
                      ^^^^^^^^^
-severe: line 206, column 32 of dart:async/broadcast_stream_controller.dart: [AnalyzerError] The getter '_next' is not defined for the class 'StreamSubscription<T>'
+severe: line 206, column 32 of dart:async/broadcast_stream_controller.dart: [AnalyzerMessage] The getter '_next' is not defined for the class 'StreamSubscription<T>'
     if (identical(subscription._next, subscription)) return null;
                                ^^^^^
 warning: line 8, column 67 of dart:async/broadcast_stream_controller.dart: [DownCastComposite] controller (_StreamControllerLifecycle<dynamic>) will need runtime check to cast to type _StreamControllerLifecycle<T>
   _BroadcastStream(_StreamControllerLifecycle controller) : super(controller);
                                                                   ^^^^^^^^^^
 warning: line 36, column 15 of dart:async/broadcast_stream_controller.dart: [DownCastComposite] controller (_StreamControllerLifecycle<dynamic>) will need runtime check to cast to type _StreamControllerLifecycle<T>
       : super(controller, onData, onError, onDone, cancelOnError) {
               ^^^^^^^^^^
 warning: line 40, column 52 of dart:async/broadcast_stream_controller.dart: [DownCastComposite] super._controller (_StreamControllerLifecycle<T>) will need runtime check to cast to type _BroadcastStreamController<T>
   _BroadcastStreamController<T> get _controller => super._controller;
@@ skipping 72 matching lines @@
                                                      ^^^^^^^^^^^^^
 warning: line 66, column 61 of dart:async/schedule_microtask.dart: [DownCastComposite] callback (dynamic) will need runtime check to cast to type () → void
     _nextCallback = _lastCallback = new _AsyncCallbackEntry(callback);
                                                             ^^^^^^^^
 warning: line 71, column 60 of dart:async/schedule_microtask.dart: [DownCastComposite] callback (dynamic) will need runtime check to cast to type () → void
     _AsyncCallbackEntry newEntry = new _AsyncCallbackEntry(callback);
                                                            ^^^^^^^^
 warning: line 84, column 55 of dart:async/schedule_microtask.dart: [DownCastComposite] callback (dynamic) will need runtime check to cast to type () → void
   _AsyncCallbackEntry entry = new _AsyncCallbackEntry(callback);
                                                       ^^^^^^^^
-severe: line 1227, column 17 of dart:async/stream.dart: [AnalyzerError] The method '_addError' is not defined for the class 'StreamController'
+severe: line 1227, column 17 of dart:async/stream.dart: [AnalyzerMessage] The method '_addError' is not defined for the class 'StreamController'
       eventSink._addError(error, stackTrace);  // Avoid Zone error replacement.
                 ^^^^^^^^^
-severe: line 396, column 30 of dart:async/stream.dart: [AnalyzerError] The getter '_addError' is not defined for the class 'StreamController'
+severe: line 396, column 30 of dart:async/stream.dart: [AnalyzerMessage] The getter '_addError' is not defined for the class 'StreamController'
           onError: eventSink._addError,  // Avoid Zone error replacement.
                              ^^^^^^^^^
-severe: line 321, column 34 of dart:async/stream.dart: [AnalyzerError] The getter '_addError' is not defined for the class 'StreamController'
+severe: line 321, column 34 of dart:async/stream.dart: [AnalyzerMessage] The getter '_addError' is not defined for the class 'StreamController'
       final addError = eventSink._addError;
                                  ^^^^^^^^^
 warning: line 90, column 25 of dart:async/stream.dart: [DownCastComposite] value (dynamic) will need runtime check to cast to type T
         controller._add(value);
                         ^^^^^
 warning: line 217, column 41 of dart:async/stream.dart: [DownCastComposite] mapSink ((EventSink<T>) → EventSink<dynamic>) will need runtime check to cast to type (EventSink<dynamic>) → EventSink
     return new _BoundSinkStream(source, mapSink);
                                         ^^^^^^^
 warning: line 249, column 44 of dart:async/stream.dart: [DownCastComposite] onListen ((StreamSubscription<T>) → void) will need runtime check to cast to type (StreamSubscription<dynamic>) → void
     return new _AsBroadcastStream<T>(this, onListen, onCancel);
@@ skipping 531 matching lines @@
                                                    ^^^^
 warning: line 490, column 52 of dart:collection/queue.dart: [DownCastComposite] list (List<dynamic>) will need runtime check to cast to type Iterable<E>
           _table.setRange(_tail, _tail + endSpace, list, 0);
                                                    ^^^^
 warning: line 491, column 40 of dart:collection/queue.dart: [DownCastComposite] list (List<dynamic>) will need runtime check to cast to type Iterable<E>
           _table.setRange(0, preSpace, list, endSpace);
                                        ^^^^
 warning: line 738, column 16 of dart:collection/queue.dart: [DownCastComposite] _queue._table[_position] (dynamic) will need runtime check to cast to type E
     _current = _queue._table[_position];
                ^^^^^^^^^^^^^^^^^^^^^^^^
-severe: line 610, column 60 of dart:collection/splay_tree.dart: [AnalyzerError] The getter '_validKey' is not defined for the class '_SplayTree<K>'
+severe: line 610, column 60 of dart:collection/splay_tree.dart: [AnalyzerMessage] The getter '_validKey' is not defined for the class '_SplayTree<K>'
         new SplayTreeSet<K>(setOrMap._comparator, setOrMap._validKey);
                                                            ^^^^^^^^^
-severe: line 610, column 38 of dart:collection/splay_tree.dart: [AnalyzerError] The getter '_comparator' is not defined for the class '_SplayTree<K>'
+severe: line 610, column 38 of dart:collection/splay_tree.dart: [AnalyzerMessage] The getter '_comparator' is not defined for the class '_SplayTree<K>'
         new SplayTreeSet<K>(setOrMap._comparator, setOrMap._validKey);
                                      ^^^^^^^^^^^
 warning: line 151, column 12 of dart:collection/splay_tree.dart: [DownCastComposite] current (_SplayTreeNode<dynamic>) will need runtime check to cast to type _SplayTreeNode<K>
     return current;
            ^^^^^^^
 warning: line 167, column 12 of dart:collection/splay_tree.dart: [DownCastComposite] current (_SplayTreeNode<dynamic>) will need runtime check to cast to type _SplayTreeNode<K>
     return current;
            ^^^^^^^
 warning: line 265, column 23 of dart:collection/splay_tree.dart: [DownCastComposite] (compare == null) ? Comparable.compare : compare (dynamic) will need runtime check to cast to type (K, K) → int
       : _comparator = (compare == null) ? Comparable.compare : compare,
@@ skipping 84 matching lines @@
                    ^^^^^^
 warning: line 765, column 39 of dart:collection/splay_tree.dart: [DownCastComposite] element (Object) will need runtime check to cast to type E
       if (_validKey(element)) _remove(element);
                                       ^^^^^^^
 warning: line 779, column 39 of dart:collection/splay_tree.dart: [DownCastComposite] object (Object) will need runtime check to cast to type E
       if (_validKey(object) && _splay(object) == 0) retainSet.add(_root.key);
                                       ^^^^^^
 warning: line 791, column 23 of dart:collection/splay_tree.dart: [DownCastComposite] object (Object) will need runtime check to cast to type E
     int comp = _splay(object);
                       ^^^^^^
-severe: line 514, column 46 of dart:js: [AnalyzerError] The name 'Window' is not defined and cannot be used in an 'is' expression
+severe: line 514, column 46 of dart:js: [AnalyzerMessage] The name 'Window' is not defined and cannot be used in an 'is' expression
       || o is Node || o is TypedData || o is Window) {
                                              ^^^^^^
-severe: line 553, column 46 of dart:js: [AnalyzerError] The name 'Window' is not defined and cannot be used in an 'is' expression
+severe: line 553, column 46 of dart:js: [AnalyzerMessage] The name 'Window' is not defined and cannot be used in an 'is' expression
       || o is Node || o is TypedData || o is Window)) {
                                              ^^^^^^
-severe: line 467, column 5 of dart:js: [AnalyzerError] Undefined name 'getIsolateAffinityTag'
+severe: line 467, column 5 of dart:js: [AnalyzerMessage] Undefined name 'getIsolateAffinityTag'
     getIsolateAffinityTag(r'_$dart_dartClosure');
     ^^^^^^^^^^^^^^^^^^^^^
-severe: line 552, column 60 of dart:js: [AnalyzerError] The name 'ImageData' is not defined and cannot be used in an 'is' expression
+severe: line 552, column 60 of dart:js: [AnalyzerMessage] The name 'ImageData' is not defined and cannot be used in an 'is' expression
       && (o is Blob || o is Event || o is KeyRange || o is ImageData
                                                            ^^^^^^^^^
-severe: line 513, column 63 of dart:js: [AnalyzerError] The name 'ImageData' is not defined and cannot be used in an 'is' expression
+severe: line 513, column 63 of dart:js: [AnalyzerMessage] The name 'ImageData' is not defined and cannot be used in an 'is' expression
   } else if (o is Blob || o is Event || o is KeyRange || o is ImageData
                                                               ^^^^^^^^^
-severe: line 465, column 5 of dart:js: [AnalyzerError] Undefined name 'getIsolateAffinityTag'
+severe: line 465, column 5 of dart:js: [AnalyzerMessage] Undefined name 'getIsolateAffinityTag'
     getIsolateAffinityTag(r'_$dart_dartObject');
     ^^^^^^^^^^^^^^^^^^^^^
-severe: line 514, column 15 of dart:js: [AnalyzerError] The name 'Node' is not defined and cannot be used in an 'is' expression
+severe: line 514, column 15 of dart:js: [AnalyzerMessage] The name 'Node' is not defined and cannot be used in an 'is' expression
       || o is Node || o is TypedData || o is Window) {
               ^^^^
-severe: line 553, column 15 of dart:js: [AnalyzerError] The name 'Node' is not defined and cannot be used in an 'is' expression
+severe: line 553, column 15 of dart:js: [AnalyzerMessage] The name 'Node' is not defined and cannot be used in an 'is' expression
       || o is Node || o is TypedData || o is Window)) {
               ^^^^
-severe: line 513, column 32 of dart:js: [AnalyzerError] The name 'Event' is not defined and cannot be used in an 'is' expression
+severe: line 513, column 32 of dart:js: [AnalyzerMessage] The name 'Event' is not defined and cannot be used in an 'is' expression
   } else if (o is Blob || o is Event || o is KeyRange || o is ImageData
                                ^^^^^
-severe: line 552, column 29 of dart:js: [AnalyzerError] The name 'Event' is not defined and cannot be used in an 'is' expression
+severe: line 552, column 29 of dart:js: [AnalyzerMessage] The name 'Event' is not defined and cannot be used in an 'is' expression
       && (o is Blob || o is Event || o is KeyRange || o is ImageData
                             ^^^^^
-warning: line 449, column 29 of dart:js: [AnalyzerError] Local variables cannot be referenced before they are declared
+warning: line 449, column 29 of dart:js: [AnalyzerMessage] Local variables cannot be referenced before they are declared
     _checkRange(start, end, length);
                             ^^^^^^
-severe: line 465, column 5 of dart:js: [AnalyzerError] The function 'getIsolateAffinityTag' is not defined
+severe: line 465, column 5 of dart:js: [AnalyzerMessage] The function 'getIsolateAffinityTag' is not defined
     getIsolateAffinityTag(r'_$dart_dartObject');
     ^^^^^^^^^^^^^^^^^^^^^
-severe: line 552, column 43 of dart:js: [AnalyzerError] The name 'KeyRange' is not defined and cannot be used in an 'is' expression
+severe: line 552, column 43 of dart:js: [AnalyzerMessage] The name 'KeyRange' is not defined and cannot be used in an 'is' expression
       && (o is Blob || o is Event || o is KeyRange || o is ImageData
                                           ^^^^^^^^
-severe: line 513, column 46 of dart:js: [AnalyzerError] The name 'KeyRange' is not defined and cannot be used in an 'is' expression
+severe: line 513, column 46 of dart:js: [AnalyzerMessage] The name 'KeyRange' is not defined and cannot be used in an 'is' expression
   } else if (o is Blob || o is Event || o is KeyRange || o is ImageData
                                              ^^^^^^^^
-severe: line 467, column 5 of dart:js: [AnalyzerError] The function 'getIsolateAffinityTag' is not defined
+severe: line 467, column 5 of dart:js: [AnalyzerMessage] The function 'getIsolateAffinityTag' is not defined
     getIsolateAffinityTag(r'_$dart_dartClosure');
     ^^^^^^^^^^^^^^^^^^^^^
-severe: line 552, column 16 of dart:js: [AnalyzerError] The name 'Blob' is not defined and cannot be used in an 'is' expression
+severe: line 552, column 16 of dart:js: [AnalyzerMessage] The name 'Blob' is not defined and cannot be used in an 'is' expression
       && (o is Blob || o is Event || o is KeyRange || o is ImageData
                ^^^^
-severe: line 513, column 19 of dart:js: [AnalyzerError] The name 'Blob' is not defined and cannot be used in an 'is' expression
+severe: line 513, column 19 of dart:js: [AnalyzerMessage] The name 'Blob' is not defined and cannot be used in an 'is' expression
   } else if (o is Blob || o is Event || o is KeyRange || o is ImageData
                   ^^^^
+warning: line 90, column 8 of dart:js: [AnalyzerMessage] Target of URI does not exist: 'dart:html'
+import 'dart:html' show Blob, Event, ImageData, Node, Window;
+       ^^^^^^^^^^^
+warning: line 92, column 8 of dart:js: [AnalyzerMessage] Target of URI does not exist: 'dart:indexed_db'
+import 'dart:indexed_db' show KeyRange;
+       ^^^^^^^^^^^^^^^^^
 warning: line 357, column 44 of dart:js: [DownCastComposite] _convertToJS ((dynamic) → dynamic) will need runtime check to cast to type (E) → dynamic
       : super._fromJs([]..addAll(other.map(_convertToJS)));
                                            ^^^^^^^^^^^^
 warning: line 390, column 12 of dart:js: [DownCastComposite] super[index] (dynamic) will need runtime check to cast to type E
     return super[index];
            ^^^^^^^^^^^^
 warning: line 425, column 24 of dart:js: [DownCastImplicit] list (Object) will need runtime check to cast to type List<dynamic>
     callMethod('push', list);
                        ^^^^
 warning: line 435, column 12 of dart:js: [DownCastComposite] callMethod('splice', [index, 1])[0] (dynamic) will need runtime check to cast to type E
     return callMethod('splice', [index, 1])[0];
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 440, column 12 of dart:js: [DownCastComposite] callMethod('pop') (dynamic) will need runtime check to cast to type E
     return callMethod('pop');
            ^^^^^^^^^^^^^^^^^
 warning: line 558, column 52 of dart:js: [DownCastImplicit] ms (num) will need runtime check to cast to type int
     return new DateTime.fromMillisecondsSinceEpoch(ms);
                                                    ^^
 warning: line 568, column 12 of dart:js: [DownCastImplicit] _getDartProxy(o, _DART_CLOSURE_PROPERTY_NAME, (o) => new JsFunction._fromJs(o)) (Object) will need runtime check to cast to type JsObject
     return _getDartProxy(o, _DART_CLOSURE_PROPERTY_NAME,
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 571, column 12 of dart:js: [DownCastImplicit] _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME, (o) => new JsArray._fromJs(o)) (Object) will need runtime check to cast to type JsObject
     return _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME,
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 warning: line 574, column 12 of dart:js: [DownCastImplicit] _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME, (o) => new JsObject._fromJs(o)) (Object) will need runtime check to cast to type JsObject
     return _getDartProxy(o, _DART_OBJECT_PROPERTY_NAME,
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^