Zzz*_*Zzz 14 xcode asynchronous compiler-errors dart flutter
升级之前，一切都运行得很好。这是我升级后收到的完整错误：
type 'DillSetterBuilder' is not a subtype of type 'SourceMemberBuilderImpl?' in type cast
#0 SourceLibraryBuilder.checkMemberConflicts.<anonymous closure> (package:front_end/src/fasta/source/source_library_builder.dart:998:22)
#1 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:574:13)
#2 Scope.forEachLocalSetter (package:front_end/src/fasta/scope.dart:424:14)
#3 SourceLibraryBuilder.checkMemberConflicts (package:front_end/src/fasta/source/source_library_builder.dart:974:11)
#4 SourceLibraryBuilder.build (package:front_end/src/fasta/source/source_library_builder.dart:1057:5)
#5 IncrementalCompiler.compileExpression.<anonymous closure> (package:front_end/src/fasta/incremental_compiler.dart:1817:20)
#6 IncrementalCompiler.compileExpression.<anonymous closure>
[#7-#59...]
the Dart compiler exited unexpectedly.
the Dart compiler exited unexpectedly.