anchor.diff:      }
       out.writeln('final fastaAnalyzerErrorCodes = <ErrorCode?>[null,');
       for (var entry in sorted) {
  -      List<String> name = nameForEntry(entry);
  +      List<String> name = nameForEntry(entry!);
         out.writeln('_${name[1]},');
       }
       out.writeln('];');
  
positive.code:           untranslatedFastaErrorCodes.add(fastaErrorCode);
          }
        }
        token = token.next;
      }
      if (untranslatedFastaErrorCodes.isNotEmpty) {
        print('');
  
negative.code:     }
      sortedErrorCodes.sort();
      for (var errorCode in sortedErrorCodes) {
        final entry = entryMap[errorCode]!;
        final className = nameForEntry(entry)[0];
        out.writeln();
        out.writeln('const $className _$errorCode =');
  