Exception thrown by the migration tool

[mjimaz]

Please include the SDK version (2.19.473941130-edge+google3-v2) in your bug report.

To attempt to perform migration anyway, you may re-run with --ignore-exceptions.

Exception details:

type 'MixinElementImpl' is not a subtype of type 'ClassElement' in type cast at offset 591 in /google/src/cloud/mjimaz/dart_migration/google3/blaze-bin/ads/awapps2/video/simple/construction/language_selector/testing/lib/language_selector_po.g.dart (PageLoaderElement $root)

#0 EdgeBuilder._handleFieldOverriddenDeclaration (package:nnbd_migration/src/edge_builder.dart:2854:63) #1 EdgeBuilder.visitVariableDeclarationList (package:nnbd_migration/src/edge_builder.dart:2030:11) #2 VariableDeclarationListImpl.accept (package:analyzer/src/dart/ast/ast.dart:13160:15) #3 EdgeBuilder._dispatch (package:nnbd_migration/src/edge_builder.dart:2363:24) #4 EdgeBuilder.visitNode (package:nnbd_migration/src/edge_builder.dart:1555:9) #5 GeneralizingAstVisitor.visitAnnotatedNode (package:analyzer/dart/ast/visitor.dart:135:48) #6 GeneralizingAstVisitor.visitDeclaration (package:analyzer/dart/ast/visitor.dart:251:44) #7 GeneralizingAstVisitor.visitClassMember (package:analyzer/dart/ast/visitor.dart:197:44) #8 GeneralizingAstVisitor.visitFieldDeclaration (package:analyzer/dart/ast/visitor.dart:318:54) #9 FieldDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:4697:50) #10 EdgeBuilder._dispatch (package:nnbd_migration/src/edge_builder.dart:2363:24) #11 EdgeBuilder._dispatchList (package:nnbd_migration/src/edge_builder.dart:2381:7) #12 EdgeBuilder.visitClassOrMixinOrExtensionDeclaration (package:nnbd_migration/src/edge_builder.dart:705:7) #13 EdgeBuilder.visitClassDeclaration (package:nnbd_migration/src/edge_builder.dart:663:5) #14 ClassDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:1888:50) #15 EdgeBuilder._dispatch (package:nnbd_migration/src/edge_builder.dart:2363:24) #16 EdgeBuilder.visitNode (package:nnbd_migration/src/edge_builder.dart:1555:9) #17 GeneralizingAstVisitor.visitCompilationUnit (package:analyzer/dart/ast/visitor.dart:213:52) #18 CompletenessTracker.visitCompilationUnit. (package:nnbd_migration/src/utilities/completeness_tracker.dart:52:24) #19 PermissiveModeVisitor.reportExceptionsIfPermissive (package:nnbd_migration/src/utilities/permissive_mode.dart:26:24) #20 CompletenessTracker.visitCompilationUnit (package:nnbd_migration/src/utilities/completeness_tracker.dart:43:5) #21 CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:2396:50) #22 NullabilityMigrationImpl.processInput (package:nnbd_migration/src/nullability_migration_impl.dart:223:12) #23 NonNullableFix.processUnit (package:nnbd_migration/src/front_end/non_nullable_fix.dart:162:16) #24 _FixCodeProcessor.runLaterPhases. (package:nnbd_migration/migration_cli.dart:1088:19) #25 _FixCodeProcessor.processResources (package:nnbd_migration/migration_cli.dart:1020:26) #26 _FixCodeProcessor.runLaterPhases (package:nnbd_migration/migration_cli.dart:1086:5) #27 MigrationCliRunner.run (package:nnbd_migration/migration_cli.dart:695:24) #28 startMigrationTool (package:dart.null_safety.migration/src/migration_runner.dart:416:5) #29 main (package:dart.null_safety.migration/migration.dart:70:3) #30 main (google3:///dart/null_safety/migration/bin/migration.dart:7:5)

Unhandled error: Instance of 'MigrationExit' #0 MigrationCliRunner.onException (package:nnbd_migration/migration_cli.dart:583:9) #1 NullabilityMigrationAdapter.reportException (package:nnbd_migration/src/front_end/non_nullable_fix.dart:549:21) #2 PermissiveModeVisitor.reportExceptionsIfPermissive (package:nnbd_migration/src/utilities/permissive_mode.dart:28:19) #3 CompletenessTracker.visitCompilationUnit (package:nnbd_migration/src/utilities/completeness_tracker.dart:43:5) #4 CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:2396:50) #5 NullabilityMigrationImpl.processInput (package:nnbd_migration/src/nullability_migration_impl.dart:223:12) #6 NonNullableFix.processUnit (package:nnbd_migration/src/front_end/non_nullable_fix.dart:162:16) #7 _FixCodeProcessor.runLaterPhases. (package:nnbd_migration/migration_cli.dart:1088:19) #8 _FixCodeProcessor.processResources (package:nnbd_migration/migration_cli.dart:1020:26) #9 _FixCodeProcessor.runLaterPhases (package:nnbd_migration/migration_cli.dart:1086:5) #10 MigrationCliRunner.run (package:nnbd_migration/migration_cli.dart:695:24) #11 startMigrationTool (package:dart.null_safety.migration/src/migration_runner.dart:416:5) #12 main (package:dart.null_safety.migration/migration.dart:70:3) #13 main (google3:///dart/null_safety/migration/bin/migration.dart:7:5)