[Macros] ClassTypeBuilder.declareType with mixin crashes the dart analysis server in vscode

[littleGnAl]

I'm not very sure if it a bug or by design at this time, ClassTypeBuilder.declareType with mixin crashes the dart analysis server in vscode

  @override
  FutureOr<void> buildTypesForClass(ClassDeclaration clazz, ClassTypeBuilder builder) {
    final mixinName = '${clazz.identifier.name}Mixin';

    builder.declareType(
      mixinName,
      DeclarationCode.fromParts([
        // Crash the dart analysis server in vscode
        'mixin $mixinName {}',
      ]),
    );

    builder.appendMixins([RawTypeAnnotationCode.fromString(mixinName)]);
  }

But with mixin class works fine

  @override
  FutureOr<void> buildTypesForClass(ClassDeclaration clazz, ClassTypeBuilder builder) {
    final mixinName = '${clazz.identifier.name}Mixin';

    builder.declareType(
      mixinName,
      DeclarationCode.fromParts([
        // Works fine
        'mixin class $mixinName {}',
      ]),
    );

    builder.appendMixins([RawTypeAnnotationCode.fromString(mixinName)]);
  }