anchor.diff:  }
   
   void expectComplexTypeParam(String source,
  -    {bool splitGtGt: true,
  -    String expectedAfter,
  +    {String expectedAfter,
       List<String> expectedCalls,
       List<ExpectedError> expectedErrors}) {
     Token start = scan(source);
  
positive.code: 
  import 'package:front_end/src/fasta/messages.dart';
  import 'package:front_end/src/fasta/parser.dart';
  import 'package:front_end/src/fasta/parser/token_stream_rewriter.dart';
  import 'package:front_end/src/fasta/parser/type_info.dart';
  import 'package:front_end/src/fasta/parser/type_info_impl.dart';
  import 'package:front_end/src/fasta/scanner.dart';
  
negative.code: }
  
  void expectComplexTypeArg(String source,
      {String expectedAfter,
      List<String> expectedCalls,
      List<ExpectedError> expectedErrors}) {
    Token start = scan(source);
  