Analysis exception during edit: Unsupported initializer

[timsneath]

Exception from analysis server (running from VSCode / Dart Code)

What I was doing

Adding some overrides for constructors in a class SpectrumColor, which extends
Color and is always opaque.

Versions

• Flutter SDK 1.6.1-pre.57
• Visual Studio Code 1.34.0
• Dart Code 3.0.2

Analyzer Info

The analyzer was launched using the arguments:

/Users/timsneath/flutter/bin/cache/dart-sdk/bin/snapshots/analysis_server.dart.snapshot
--client-id=Dart-Code.dart-code
--client-version=3.0.2

Exception

Captured exception

Unsupported operation: unsupported initializer super.SpectrumColor().fromByteValue(int, value)
#0      Driver._captureExceptions.errorFunction (package:analysis_server/src/server/driver.dart:581:7)
#1      _CustomZone.handleUncaughtError (dart:async/zone.dart:1003:19)
#2      Future._propagateToListeners (dart:async/future_impl.dart:555:16)
#3      Future._completeError (dart:async/future_impl.dart:491:5)
#4      _SyncCompleter._completeError (dart:async/future_impl.dart:55:12)
#5      _Completer.completeError (dart:async/future_impl.dart:27:5)
#6      _AsyncAwaitCompleter.completeError.<anonymous closure> (dart:async-patch/async_patch.dart:43:20)
#7      _rootRun (dart:async/zone.dart:1120:38)
#8      _CustomZone.run (dart:async/zone.dart:1021:19)
#9      _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#10     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#11     _rootRun (dart:async/zone.dart:1124:13)
#12     _CustomZone.run (dart:async/zone.dart:1021:19)
#13     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#14     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#15     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#16     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#17     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:391:30)
#18     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
#19     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:171:12)