Dart crashes on incorrect generic class declaration instead of throwing compile error

Dart SDK Version: 2.3.1-dev.0.0
OS: Windows 10 64 bit

Dart crashes on the following code example instead of throwing compile time error:
``` dart
class A<X> {}
class test<X extends num> = A<X>;
main() {}
```
Analyzer is OK with this.

Please note that dart throws expected error if I change `test` class declaration to `class test<X> = A<X>`.

It's not reproducible with dart 2.0 for me (tested 2.0.0-dev.69.5) and is reproducibel with dart 2.2.0 (tested 2.2.0-dev.2.1).

Crashing sample output is:
> $> dart test.dart
> Crash when compiling null, 
> at character offset null:
> NoSuchMethodError: The method 'buildType' was called on null.
> Receiver: null
> Tried calling: buildType(Instance of 'KernelLibraryBuilder', null)
> #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
> #1      KernelNamedTypeBuilder.build (package:front_end/src/fasta/kernel/kernel_named_type_builder.dart:57:24)
> #2      KernelTypeVariableBuilder.finish (package:front_end/src/fasta/kernel/kernel_type_variable_builder.dart:86:32)
> #3      KernelLibraryBuilder.finishTypeVariables (package:front_end/src/fasta/kernel/kernel_library_builder.dart:1247:15)
> #4      SourceLoader.finishTypeVariables.<anonymous closure> (package:front_end/src/fasta/source/source_loader.dart:501:26)
> #5      __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:367:8)
> #6      SourceLoader.finishTypeVariables (package:front_end/src/fasta/source/source_loader.dart:499:14)
> #7      KernelTarget.buildOutlines.<anonymous closure> (package:front_end/src/fasta/kernel/kernel_target.dart:262:14)
> <asynchronous suspension>
> #8      withCrashReporting (package:front_end/src/fasta/crash.dart:122:24)
> <asynchronous suspension>
> #9      KernelTarget.buildOutlines (package:front_end/src/fasta/kernel/kernel_target.dart:249:12)
> <asynchronous suspension>
> #10     IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:299:52)
> <asynchronous suspension>
> #11     CompilerContext.runInContext.<anonymous closure>.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:122:46)
> #12     new Future.sync (dart:async/future.dart:224:31)
> #13     CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:122:19)
> #14     _rootRun (dart:async/zone.dart:1124:13)
> #15     _CustomZone.run (dart:async/zone.dart:1021:19)
> #16     _runZoned (dart:async/zone.dart:1516:10)
> #17     runZoned (dart:async/zone.dart:1463:12)
> #18     CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:121:12)
> #19     IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:127:20)
> <asynchronous suspension>
> #20     IncrementalCompiler.compile (package:vm/incremental_compiler.dart:48:44)
> <asynchronous suspension>
> #21     IncrementalCompilerWrapper.compileInternal (file:///C:/b/s/w/ir/cache/builder/sdk/pkg/vm/bin/kernel_service.dart:216:28)
> <asynchronous suspension>
> #22     Compiler.compile.<anonymous closure> (file:///C:/b/s/w/ir/cache/builder/sdk/pkg/vm/bin/kernel_service.dart:144:31)
> <asynchronous suspension>
> #23     new Future.<anonymous closure> (dart:async/future.dart:176:37)
> #24     _rootRun (dart:async/zone.dart:1120:38)
> #25     _CustomZone.run (dart:async/zone.dart:1021:19)
> #26     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
> #27     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
> #28     _rootRun (dart:async/zone.dart:1124:13)
> #29     _CustomZone.run (dart:async/zone.dart:1021:19)
> #30     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)
> #31     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:21:15)
> #32     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
> #33     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
> #34     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:171:12)
> 
> #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)
> #1      KernelNamedTypeBuilder.build (package:front_end/src/fasta/kernel/kernel_named_type_builder.dart:57:24)
> #2      KernelTypeVariableBuilder.finish (package:front_end/src/fasta/kernel/kernel_type_variable_builder.dart:86:32)
> #3      KernelLibraryBuilder.finishTypeVariables (package:front_end/src/fasta/kernel/kernel_library_builder.dart:1247:15)
> #4      SourceLoader.finishTypeVariables.<anonymous closure> (package:front_end/src/fasta/source/source_loader.dart:501:26)
> #5      __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:367:8)
> #6      SourceLoader.finishTypeVariables (package:front_end/src/fasta/source/source_loader.dart:499:14)
> #7      KernelTarget.buildOutlines.<anonymous closure> (package:front_end/src/fasta/kernel/kernel_target.dart:262:14)
> <asynchronous suspension>
> #8      withCrashReporting (package:front_end/src/fasta/crash.dart:122:24)
> <asynchronous suspension>
> #9      KernelTarget.buildOutlines (package:front_end/src/fasta/kernel/kernel_target.dart:249:12)
> <asynchronous suspension>
> #10     IncrementalCompiler.computeDelta.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:299:52)
> <asynchronous suspension>
> #11     CompilerContext.runInContext.<anonymous closure>.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:122:46)
> #12     new Future.sync (dart:async/future.dart:224:31)
> #13     CompilerContext.runInContext.<anonymous closure> (package:front_end/src/fasta/compiler_context.dart:122:19)
> #14     _rootRun (dart:async/zone.dart:1124:13)
> #15     _CustomZone.run (dart:async/zone.dart:1021:19)
> #16     _runZoned (dart:async/zone.dart:1516:10)
> #17     runZoned (dart:async/zone.dart:1463:12)
> #18     CompilerContext.runInContext (package:front_end/src/fasta/compiler_context.dart:121:12)
> #19     IncrementalCompiler.computeDelta (package:front_end/src/fasta/incremental_compiler.dart:127:20)
> <asynchronous suspension>
> #20     IncrementalCompiler.compile (package:vm/incremental_compiler.dart:48:44)
> <asynchronous suspension>
> #21     IncrementalCompilerWrapper.compileInternal (file:///C:/b/s/w/ir/cache/builder/sdk/pkg/vm/bin/kernel_service.dart:216:28)
> <asynchronous suspension>
> #22     Compiler.compile.<anonymous closure> (file:///C:/b/s/w/ir/cache/builder/sdk/pkg/vm/bin/kernel_service.dart:144:31)
> <asynchronous suspension>
> #23     new Future.<anonymous closure> (dart:async/future.dart:176:37)
> #24     _rootRun (dart:async/zone.dart:1120:38)
> #25     _CustomZone.run (dart:async/zone.dart:1021:19)
> #26     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
> #27     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
> #28     _rootRun (dart:async/zone.dart:1124:13)
> #29     _CustomZone.run (dart:async/zone.dart:1021:19)
> #30     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)
> #31     Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:21:15)
> #32     _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
> #33     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
> #34     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:171:12)


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Dart crashes on incorrect generic class declaration instead of throwing compile error #36946

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Dart crashes on incorrect generic class declaration instead of throwing compile error #36946

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