anchor.diff:      var res = new LogEntryTable();
       for (String key in json.keys) {
         var id = new MessageId.fromJson(key);
  -      res.entries[id] = json[key]
  -          .map((v) => new BuildLogEntry.fromJson(v))
  -          .toList();
  +      res.entries[id] =
  +          json[key].map((v) => new BuildLogEntry.fromJson(v)).toList();
       }
       return res;
     }
  
positive.code: // so it can easily be used both in the transformers and in client-side apps
  // (for example in the log_injector).
  import 'dart:collection' show LinkedHashMap;
  import 'package:source_span/source_span.dart';
  
  /// A globally unique identifier for an error message. This identifier should be
  /// stable, that is, it should never change after it is asigned to a particular
  /// message. That allows us to document our error messages and make them
  /// searchable for prosperity.
  class MessageId implements Comparable {
    /// Name of the package that declares this message.
    final String package;
  
  
negative.code:         data.substring(0, index), int.parse(data.substring(index + 1)));
    }
  
    operator ==(Object other) =>
        other is MessageId && package == other.package && id == other.id;
  
    int get hashCode => 31 * package.hashCode + id;
  }
  
  