Issue 1:
From https://ci.appveyor.com/project/flutter/flutter/build/1.0.10832:

15:03 +2123 ~20: loading C:\projects\flutter sdk\packages\flutter\test\widgets\semantics_5_test.dart
unhandled error during finalization of test:
C:\projects\flutter sdk\packages\flutter\test\widgets\semantics_4_test.dart
FileSystemException: Deletion failed, path = 'C:\Users\appveyor\AppData\Local\Temp\1\dart_test_listener4106bb48-2bb3-11e8-81e6-00155d07f5b1' (OS Error: The process cannot access the file because it is being used by another process.
, errno = 32)
15:03 +2123 ~20 -1: loading C:\projects\flutter sdk\packages\flutter\test\widgets\semantics_4_test.dart [E]
FileSystemException: Deletion failed, path = 'C:\Users\appveyor\AppData\Local\Temp\1\dart_test_listener4106bb48-2bb3-11e8-81e6-00155d07f5b1' (OS Error: The process cannot access the file because it is being used by another process.
, errno = 32)
package:flutter_tools/src/test/flutter_platform.dart 529 _FlutterPlatform._startTest
===== asynchronous gap ===========================
dart:async/future_impl.dart 22 _Completer.completeError
package:flutter_tools/src/test/flutter_platform.dart _FlutterPlatform._startTest
===== asynchronous gap ===========================
dart:async/zone.dart 1055 _CustomZone.registerUnaryCallback
dart:async-patch/dart:async/async_patch.dart 77 _asyncThenWrapperHelper
package:flutter_tools/src/test/flutter_platform.dart 264 _FlutterPlatform._startTest
package:flutter_tools/src/test/flutter_platform.dart 257 _FlutterPlatform.loadChannel
package:test/src/runner/plugin/platform.dart 63 PlatformPlugin.load
===== asynchronous gap ===========================
dart:async/zone.dart 1047 _CustomZone.registerCallback
dart:async/zone.dart 964 _CustomZone.bindCallbackGuarded
dart:async/schedule_microtask.dart 147 scheduleMicrotask
dart:async/future.dart 198 new Future.microtask
package:test/src/runner/plugin/platform.dart 60 PlatformPlugin.load
package:test/src/runner/loader.dart 252 Loader.loadFile.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1055 _CustomZone.registerUnaryCallback
dart:async-patch/dart:async/async_patch.dart 77 _asyncThenWrapperHelper
package:test/src/runner/loader.dart 246 Loader.loadFile.<fn>
package:test/src/runner/load_suite.dart 89 new LoadSuite.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1047 _CustomZone.registerCallback
dart:async/zone.dart 964 _CustomZone.bindCallbackGuarded
dart:async/schedule_microtask.dart 147 scheduleMicrotask
dart:async/future.dart 198 new Future.microtask
package:test/src/runner/load_suite.dart 88 new LoadSuite.<fn>.<fn>
package:test/src/utils.dart 297 invoke
package:test/src/runner/load_suite.dart 88 new LoadSuite.<fn>
package:test/src/backend/invoker.dart 403 Invoker._onRun.<fn>.<fn>.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1047 _CustomZone.registerCallback
dart:async/zone.dart 964 _CustomZone.bindCallbackGuarded
dart:async/schedule_microtask.dart 147 scheduleMicrotask
dart:async/future.dart 198 new Future.microtask
package:test/src/backend/invoker.dart 402 Invoker._onRun.<fn>.<fn>.<fn>.<fn>
dart:async/future.dart 174 new Future.<fn>
package:stack_trace/src/stack_zone_specification.dart 209 StackZoneSpecification._run
package:stack_trace/src/stack_zone_specification.dart 119 StackZoneSpecification._registerCallback.<fn>
dart:async/zone.dart 1122 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 925 _CustomZone.runGuarded
dart:async/zone.dart 965 _CustomZone.bindCallbackGuarded.<fn>
package:stack_trace/src/stack_zone_specification.dart 209 StackZoneSpecification._run
package:stack_trace/src/stack_zone_specification.dart 119 StackZoneSpecification._registerCallback.<fn>
dart:async/zone.dart 1126 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 949 _CustomZone.bindCallback.<fn>
dart:async-patch/dart:async/timer_patch.dart 21 Timer._createTimer.<fn>
dart:isolate-patch/dart:isolate/timer_impl.dart 382 _Timer._runTimers
dart:isolate-patch/dart:isolate/timer_impl.dart 416 _Timer._handleMessage
dart:isolate-patch/dart:isolate/isolate_patch.dart 165 _RawReceivePortImpl._handleMessage
===== asynchronous gap ===========================
dart:async/zone.dart 1047 _CustomZone.registerCallback
dart:async/zone.dart 964 _CustomZone.bindCallbackGuarded
dart:async/timer.dart 52 new Timer
dart:async/timer.dart 87 Timer.run
dart:async/future.dart 172 new Future
package:test/src/backend/invoker.dart 402 Invoker._onRun.<fn>.<fn>.<fn>
===== asynchronous gap ===========================
dart:async/zone.dart 1047 _CustomZone.registerCallback
dart:async/zone.dart 964 _CustomZone.bindCallbackGuarded
dart:async/schedule_microtask.dart 147 scheduleMicrotask
dart:async/future.dart 198 new Future.microtask
package:test/src/backend/invoker.dart 389 Invoker._onRun.<fn>.<fn>.<fn>
dart:async/zone.dart 1126 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 1501 runZoned
package:test/src/backend/invoker.dart 389 Invoker._onRun.<fn>.<fn>
dart:async/zone.dart 1126 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 1501 runZoned
package:test/src/backend/invoker.dart 144 Invoker.guard
package:test/src/backend/invoker.dart 441 Invoker._guardIfGuarded
package:test/src/backend/invoker.dart 388 Invoker._onRun.<fn>
package:stack_trace/src/chain.dart 101 Chain.capture.<fn>
dart:async/zone.dart 1126 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 1501 runZoned
package:stack_trace/src/chain.dart 99 Chain.capture
package:test/src/backend/invoker.dart 387 Invoker._onRun
package:test/src/backend/live_test_controller.dart 188 LiveTestController._run
package:test/src/backend/live_test_controller.dart 40 _LiveTest.run
dart:async/future.dart 200 new Future.microtask.<fn>
dart:async/zone.dart 1126 _rootRun
dart:async/zone.dart 1023 _CustomZone.run
dart:async/zone.dart 949 _CustomZone.bindCallback.<fn>
dart:async/schedule_microtask.dart 41 _microtaskLoop
dart:async/schedule_microtask.dart 50 _startMicrotaskLoop
dart:isolate-patch/dart:isolate/isolate_patch.dart 113 _runPendingImmediateCallback
dart:isolate-patch/dart:isolate/isolate_patch.dart 166 _RawReceivePortImpl._handleMessage

15:05 +2123 ~20 -1: C:\projects\flutter sdk\packages\flutter\test\widgets\semantics_5_test.dart: - Semantics 5

Issue 2:
cupertino_picker_demo.dart results in bulid Error.

2a8e35c

The latest fix checked in breaks the build with following error.

Compiler message:

file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:168:23: Error: Getter not found: 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.date,
^^^^^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:167:15: Error: Method not found: 'CupertinoDatePicker'.
CupertinoDatePicker(
^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:167:15: Error: The method 'CupertinoDatePicker' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing method, or defining a method named 'CupertinoDatePicker'.
CupertinoDatePicker(
^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:168:23: Error: The getter 'CupertinoDatePickerMode' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing getter, or defining a getter or field named 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.date,
^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:198:23: Error: Getter not found: 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.time,
^^^^^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:197:15: Error: Method not found: 'CupertinoDatePicker'.
CupertinoDatePicker(
^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:197:15: Error: The method 'CupertinoDatePicker' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing method, or defining a method named 'CupertinoDatePicker'.
CupertinoDatePicker(
^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:198:23: Error: The getter 'CupertinoDatePickerMode' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing getter, or defining a getter or field named 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.time,
^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:228:23: Error: Getter not found: 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.dateAndTime,
^^^^^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:227:15: Error: Method not found: 'CupertinoDatePicker'.
CupertinoDatePicker(
^^^^^^^^^^^^^^^^^^^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:227:15: Error: The method 'CupertinoDatePicker' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing method, or defining a method named 'CupertinoDatePicker'.
CupertinoDatePicker(
^
file:///d:/Repos/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_picker_demo.dart:228:23: Error: The getter 'CupertinoDatePickerMode' isn't defined for the class '#lib1::_CupertinoPickerDemoState'.
Try correcting the name to the name of an existing getter, or defining a getter or field named 'CupertinoDatePickerMode'.
mode: CupertinoDatePickerMode.dateAndTime,
^
Compiler failed on d:\Repos\flutter\examples\flutter_gallery\lib/main.dart
Gradle task 'assembleDebug'... Done 10.1s
Gradle task assembleDebug failed with exit code 1