Aqueduct build fails with latest Dart SDK (2.10.1) on 4.0.0-b1

[alexantenna]

Hi! Just curious is aqueduct build is compatible with latest SDK. aqueduct serve works just well!

-- Aqueduct CLI Version: 4.0.0-b1
-- Aqueduct project version: 4.0.0-b1
Resolving ASTs...
Generating runtime...
*** Uncaught error
    Bad state: Failed assertion: boolean expression must not be null
  **** Stacktrace
  * #0      ElementDisplayStringBuilder._writeNullability (package:analyzer/src/dart/element/display_string_builder.dart:252:9)
  * #1      ElementDisplayStringBuilder.writeInterfaceType (package:analyzer/src/dart/element/display_string_builder.dart:152:5)
  * #2      InterfaceTypeImpl.appendTo (package:analyzer/src/dart/element/type.dart:840:13)
  * #3      TypeImpl.getDisplayString (package:analyzer/src/dart/element/type.dart:1696:5)
  * #4      ManagedEntityRuntimeImpl._getValidatorConstructionFromAnnotation (package:aqueduct/src/runtime/orm_impl.dart:118:16)
  * #5      ManagedEntityRuntimeImpl._getValidators.<anonymous closure> (package:aqueduct/src/runtime/orm_impl.dart:156:30)
  * #6      MappedListIterable.elementAt (dart:_internal/iterable.dart:417:31)
  * #7      ListIterator.moveNext (dart:_internal/iterable.dart:343:26)
  * #8      ExpandIterator.moveNext (dart:_internal/iterable.dart:483:21)
  * #9      new List.from (dart:core-patch/array_patch.dart:50:19)
  * #10     new List.of (dart:core-patch/array_patch.dart:68:17)
  * #11     Iterable.toList (dart:core/iterable.dart:404:12)
  * #12     ManagedEntityRuntimeImpl._getValidators (package:aqueduct/src/runtime/orm_impl.dart:160:10)
  * #13     ManagedEntityRuntimeImpl._getAttributeInstantiator (package:aqueduct/src/runtime/orm_impl.dart:248:15)
  * #14     ManagedEntityRuntimeImpl._getEntityConstructor.<anonymous closure> (package:aqueduct/src/runtime/orm_impl.dart:288:26)
  * #15     MappedIterator.moveNext (dart:_internal/iterable.dart:392:20)
  * #16     Iterable.join (dart:core/iterable.dart:368:19)
  * #17     ManagedEntityRuntimeImpl._getEntityConstructor (package:aqueduct/src/runtime/orm_impl.dart:289:8)
  * #18     ManagedEntityRuntimeImpl.compile (package:aqueduct/src/runtime/orm_impl.dart:396:9)
  * #19     Build.execute.<anonymous closure> (package:runtime/src/build.dart:31:45)
  * #20     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
  * #21     Build.execute (package:runtime/src/build.dart:28:34)
  * <asynchronous suspension>
  * #22     BuildExecutable.execute (<data:application/dart>:13:259)
  * #23     main (<data:application/dart>:9:35)
  * #24     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:297:32)
  * #25     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
  ****

[Reductions]

Yes there is non documented breaking change in dart 2.9.0. The problem is fixed in master.
If you want to use it you could do one of 2 thigns:

git clone "$aqueductRepo" "$somePath"
pub global activate --source "$somePath/aqueduct"

or you could override your aqueduct dependency to point to current master head commit and run the command like this:

pub run aqueduct build

[alexantenna]

Thanks!