code in flutter/flutter code base needs to be cleaned up to use 'void' instead of 'Null' as a generic parameter

[a-siva]

Flutter has code of the form

typedef void GestureTapCancelCallback();
GestureTapCancelCallback onTapCancel;
T invokeCallback<T>(String name, RecognizerCallback<T> callback, { String debugReport() }) {
}
main() {
  invokeCallback<Null>('spontaneous onTapCancel', onTapCancel);
}

which leads to runtime errors in strong mode.

All this code needs to be converted to use

(please see issue #31858 for more details).

[a-siva]

Now that @crelier has fixed the vm parser to support 'void' generic arguments we should be ok converting
the flutter code to use this (see issue #30516 )

[leafpetersen]

This may require some progress on #30177 , in that if you try to land code that uses void as a type argument you get analyzer errors until support lands.

[mraleph]

Here is a non-exausitive list of places that need an update:

[warning] The argument type '(bool) → void' can't be assigned to the parameter type '(bool) → FutureOr<Null>'. (examples/stocks/lib/stock_settings.dart, line 88, col 22)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter_test/lib/src/binding.dart, line 453, col 31)
[warning] The argument type '(Codec) → void' can't be assigned to the parameter type '(Codec) → FutureOr<Null>'. (packages/flutter/lib/src/painting/image_stream.dart, line 336, col 22)
[warning] The argument type '(ImageInfo) → void' can't be assigned to the parameter type '(ImageInfo) → FutureOr<Null>'. (packages/flutter/lib/src/painting/image_stream.dart, line 273, col 22)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/scale.dart, line 203, col 41)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/scale.dart, line 233, col 40)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/scale.dart, line 205, col 41)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/scale.dart, line 239, col 39)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/long_press.dart, line 29, col 43)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 356, col 41)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 197, col 43)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 376, col 43)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 385, col 37)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 391, col 45)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/multitap.dart, line 383, col 39)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 123, col 40)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 216, col 39)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 169, col 41)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 209, col 39)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 175, col 42)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 196, col 42)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/monodrag.dart, line 143, col 44)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/tap.dart, line 106, col 57)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/tap.dart, line 161, col 39)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/lib/src/gestures/tap.dart, line 134, col 52)
[warning] The argument type '(ImageInfo) → void' can't be assigned to the parameter type '(ImageInfo) → FutureOr<Null>'. (packages/flutter/test/widgets/image_resolution_test.dart, line 93, col 22)
[warning] The argument type '() → void' can't be assigned to the parameter type '() → Null'. (packages/flutter/test/foundation/capture_output.dart, line 11, col 18)

[vsmenon]

The above quoted to render the generic types :

[hint] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/bots/test/prepare_package_test.dart, line 33, col 16)
[hint] Unsafe implicit cast from '(String, File) → Future<File>' to '(String, File) → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/bots/test/prepare_package_test.dart, line 130, col 47)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/bin/tasks/commands_test.dart, line 75, col 9)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/bin/tasks/commands_test.dart, line 84, col 9)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/bin/tasks/commands_test.dart, line 77, col 9)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/bin/tasks/commands_test.dart, line 86, col 9)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/framework/runner.dart, line 65, col 9)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/framework/utils.dart, line 167, col 10)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<DateTime>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/framework/utils.dart, line 174, col 10)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<TaskResult>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/tasks/integration_tests.dart, line 62, col 12)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<TaskResult>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/tasks/perf_tests.dart, line 345, col 12)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<TaskResult>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/tasks/perf_tests.dart, line 146, col 12)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<TaskResult>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/devicelab/lib/tasks/perf_tests.dart, line 407, col 12)
[hint] Unsafe implicit cast from 'Map<dynamic, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dev/tools/localizations_validator.dart, line 31, col 44)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (examples/flutter_gallery/lib/demo/material/bottom_navigation_demo.dart, line 156, col 44)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (examples/flutter_gallery/lib/demo/material/bottom_navigation_demo.dart, line 155, col 44)
[hint] Unsafe implicit cast from '(bool) → void' to '(bool) → FutureOr<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (examples/stocks/lib/stock_settings.dart, line 88, col 22)
[hint] Unsafe implicit cast from '() → dynamic' to '() → FutureOr<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/foundation/synchronous_future.dart, line 46, col 70)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/long_press.dart, line 29, col 43)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/monodrag.dart, line 196, col 42)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/multitap.dart, line 197, col 43)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/tap.dart, line 134, col 52)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/tap.dart, line 161, col 39)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/gestures/tap.dart, line 106, col 57)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/material/input_decorator.dart, line 194, col 38)
[hint] Unsafe implicit cast from 'PersistentBottomSheetController<dynamic>' to 'PersistentBottomSheetController<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/material/scaffold.dart, line 771, col 12)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/material/tabs.dart, line 140, col 41)
[hint] Unsafe implicit cast from '(Codec) → void' to '(Codec) → FutureOr<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/painting/image_stream.dart, line 336, col 22)
[hint] Unsafe implicit cast from '(ImageInfo) → void' to '(ImageInfo) → FutureOr<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/painting/image_stream.dart, line 273, col 22)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2210, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2195, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2178, col 46)
[hint] Unsafe implicit cast from 'RenderBox' to 'ChildType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2211, col 18)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2151, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/box.dart, line 2133, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2899, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2879, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2688, col 25)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2868, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2914, col 44)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2684, col 38)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2795, col 44)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2749, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2763, col 59)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2854, col 44)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2889, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2937, col 48)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2679, col 25)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2730, col 44)
[hint] Unsafe implicit cast from 'ParentData' to 'ContainerParentDataMixin<ChildType>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2655, col 73)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2832, col 46)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2810, col 57)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2762, col 63)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2739, col 54)
[hint] Unsafe implicit cast from 'Constraints' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 1674, col 59)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2675, col 38)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2922, col 44)
[hint] Unsafe implicit cast from 'ParentData' to 'ContainerParentDataMixin<ChildType>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2649, col 77)
[hint] Unsafe implicit cast from 'ParentData' to 'ParentDataType'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/rendering/object.dart, line 2803, col 61)
[hint] Unsafe implicit cast from '() → dynamic' to '() → FutureOr<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/scheduler/ticker.dart, line 435, col 67)
[hint] Unsafe implicit cast from '(dynamic) → bool' to '(Object) → bool'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/scheduler/ticker.dart, line 425, col 63)
[hint] Unsafe implicit cast from '(Null) → dynamic' to '(Null) → FutureOr<E>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/scheduler/ticker.dart, line 430, col 45)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/services/asset_bundle.dart, line 197, col 14)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/services/asset_bundle.dart, line 203, col 12)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/services/asset_bundle.dart, line 181, col 14)
[hint] Unsafe implicit cast from 'Element' to 'ParentDataElement<SliverMultiBoxAdaptorWidget>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/automatic_keep_alive.dart, line 99, col 77)
[hint] Unsafe implicit cast from 'Widget' to 'ParentDataWidget<SliverMultiBoxAdaptorWidget>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/automatic_keep_alive.dart, line 100, col 43)
[hint] Unsafe implicit cast from 'RenderObjectWidget' to 'RenderObjectToWidgetAdapter<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 792, col 48)
[hint] Unsafe implicit cast from 'RenderObject' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 865, col 26)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 463, col 42)
[hint] Unsafe implicit cast from 'RenderObject' to 'RenderObjectWithChildMixin<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 859, col 53)
[hint] Unsafe implicit cast from 'Widget' to 'RenderObjectToWidgetAdapter<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 835, col 14)
[hint] Unsafe implicit cast from 'Element' to 'RenderObjectToWidgetElement<RenderBox>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/binding.dart, line 648, col 38)
[hint] Unsafe implicit cast from '_DragAvatar<dynamic>' to '_DragAvatar<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/drag_target.dart, line 408, col 31)
[hint] Unsafe implicit cast from 'RenderObject' to 'RenderObjectWithChildMixin<RenderObject>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 4600, col 67)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<State<StatefulWidget>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 2648, col 31)
[hint] Unsafe implicit cast from 'RenderObject' to 'ContainerRenderObjectMixin<RenderObject, ContainerParentDataMixin<RenderObject>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 4666, col 107)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<State<StatefulWidget>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 3041, col 29)
[hint] Unsafe implicit cast from 'RenderObject' to 'ContainerRenderObjectMixin<RenderObject, ContainerParentDataMixin<RenderObject>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 4650, col 107)
[hint] Unsafe implicit cast from 'ProxyWidget' to 'ParentDataWidget<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 3864, col 37)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<State<StatefulWidget>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 193, col 33)
[hint] Unsafe implicit cast from 'RenderObject' to 'ContainerRenderObjectMixin<RenderObject, ContainerParentDataMixin<RenderObject>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 4658, col 107)
[hint] Unsafe implicit cast from 'RenderObject' to 'RenderObjectWithChildMixin<RenderObject>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 4614, col 67)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<State<StatefulWidget>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/framework.dart, line 2706, col 29)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 869, col 14)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 749, col 15)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 751, col 15)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 747, col 12)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 750, col 14)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 746, col 13)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 871, col 12)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 874, col 15)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 873, col 14)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 951, col 16)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 748, col 14)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 870, col 12)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 872, col 15)
[hint] Unsafe implicit cast from 'Tween<dynamic>' to 'Tween<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/implicit_animations.dart, line 1157, col 18)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<Color>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/modal_barrier.dart, line 128, col 33)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 272, col 39)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<AlignmentGeometry>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 502, col 49)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 186, col 34)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<Offset>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 128, col 37)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 228, col 34)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<RelativeRect>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 372, col 39)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<Rect>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 413, col 31)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/transitions.dart, line 320, col 36)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<T>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/lib/src/widgets/unique_widget.dart, line 39, col 36)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/foundation/capture_output.dart, line 11, col 18)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/material/app_test.dart, line 185, col 34)
[hint] Unsafe implicit cast from 'ModalRoute<dynamic>' to 'ModalRoute<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/material/will_pop_test.dart, line 24, col 14)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/semantics/semantics_service_test.dart, line 16, col 44)
[hint] Unsafe implicit cast from 'Key' to 'GlobalKey<State<StatefulWidget>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/global_keys_moving_test.dart, line 42, col 14)
[hint] Unsafe implicit cast from '(ImageInfo) → void' to '(ImageInfo) → FutureOr<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/image_resolution_test.dart, line 93, col 22)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/navigator_test.dart, line 611, col 86)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/navigator_test.dart, line 478, col 82)
[hint] Unsafe implicit cast from 'Route<dynamic>' to 'Route<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/navigator_test.dart, line 535, col 24)
[hint] Unsafe implicit cast from 'Route<dynamic>' to 'Route<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/navigator_test.dart, line 536, col 25)
[hint] Unsafe implicit cast from 'ModalRoute<dynamic>' to 'PageRoute<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/page_forward_transitions_test.dart, line 89, col 51)
[hint] Unsafe implicit cast from 'Listenable' to 'Animation<double>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/page_forward_transitions_test.dart, line 22, col 41)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, Object>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/widget_inspector_test.dart, line 496, col 48)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, Object>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/widget_inspector_test.dart, line 432, col 44)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, Object>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/widget_inspector_test.dart, line 466, col 48)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, Object>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/widget_inspector_test.dart, line 429, col 45)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, Object>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter/test/widgets/widget_inspector_test.dart, line 448, col 47)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/common/text.dart, line 86, col 27)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/common/text.dart, line 50, col 27)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/common/text.dart, line 14, col 70)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/driver/driver.dart, line 216, col 14)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/driver/driver.dart, line 324, col 18)
[hint] Unsafe implicit cast from '(Map<String, String>) → Future<Map<String, dynamic>>' to '(Map<String, String>) → Future<Map<String, String>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/extension/extension.dart, line 49, col 17)
[hint] Unsafe implicit cast from '(ByText) → Finder' to '(SerializableFinder) → Finder'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/extension/extension.dart, line 128, col 17)
[hint] Unsafe implicit cast from '(ByTooltipMessage) → Finder' to '(SerializableFinder) → Finder'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/extension/extension.dart, line 129, col 27)
[hint] Unsafe implicit cast from '(ByType) → Finder' to '(SerializableFinder) → Finder'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/extension/extension.dart, line 131, col 17)
[hint] Unsafe implicit cast from '(ByValueKey) → Finder' to '(SerializableFinder) → Finder'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_driver/lib/src/extension/extension.dart, line 130, col 21)
[hint] Unsafe implicit cast from '() → void' to '() → Null'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/binding.dart, line 453, col 31)
[hint] Unsafe implicit cast from 'RenderObject' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 216, col 12)
[hint] Unsafe implicit cast from 'RenderObject' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 205, col 12)
[hint] Unsafe implicit cast from 'Element' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 114, col 12)
[hint] Unsafe implicit cast from 'Widget' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 68, col 12)
[hint] Unsafe implicit cast from 'Element' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 103, col 12)
[hint] Unsafe implicit cast from 'Widget' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 57, col 12)
[hint] Unsafe implicit cast from 'RenderObject' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 226, col 24)
[hint] Unsafe implicit cast from 'Widget' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/controller.dart, line 78, col 24)
[hint] Unsafe implicit cast from '(Null, Null) → num' to '(T, T) → num'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/matchers.dart, line 656, col 24)
[hint] Unsafe implicit cast from 'Object' to 'T'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_test/lib/src/matchers.dart, line 682, col 20)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/android/android_device.dart, line 528, col 7)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/android/android_workflow.dart, line 200, col 7)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/android/android_workflow.dart, line 201, col 7)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/android/android_workflow.dart, line 199, col 7)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/base/process.dart, line 167, col 5)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/base/process.dart, line 166, col 5)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/commands/daemon.dart, line 57, col 12)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Map<String, dynamic>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/devfs.dart, line 420, col 13)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Map<String, dynamic>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/devfs.dart, line 504, col 15)
[hint] Unsafe implicit cast from 'Object' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/flutter_manifest.dart, line 32, col 27)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, Map<int, int>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/test/coverage_collector.dart, line 30, col 37)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, Map<int, int>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/test/coverage_collector.dart, line 30, col 29)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/test/flutter_platform.dart, line 336, col 13)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/test/flutter_platform.dart, line 335, col 13)
[hint] Unsafe implicit cast from 'Map<dynamic, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/version.dart, line 320, col 27)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Map<String, dynamic>>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/vmservice.dart, line 196, col 7)
[hint] Unsafe implicit cast from 'Future<dynamic>' to 'Future<Null>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/vmservice.dart, line 175, col 28)
[hint] Unsafe implicit cast from 'Map<String, dynamic>' to 'Map<String, String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/vmservice.dart, line 1220, col 40)
[hint] Unsafe implicit cast from 'Map<dynamic, dynamic>' to 'Map<String, dynamic>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/lib/src/vmservice.dart, line 71, col 27)
[hint] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/test/commands/create_test.dart, line 431, col 16)
[hint] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/test/commands/packages_test.dart, line 151, col 16)
[hint] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (packages/flutter_tools/test/commands/packages_test.dart, line 152, col 53)

[mraleph]

@a-siva I wanted to move forward with Gallery so I cleaned up enough places to make it run (once we have support from all components), see flutter/flutter#14107

[a-siva]

The PR has landed in flutter/flutter, closing this issue.