anchor.diff:  import 'package:analysis_server/protocol/protocol.dart';
   import 'package:analysis_server/protocol/protocol_generated.dart';
   import 'package:analysis_server/src/handler/legacy/legacy_handler.dart';
  +import 'package:analyzer/dart/analysis/results.dart';
   import 'package:analyzer/file_system/file_system.dart';
   
   /// The handler for the `execution.mapUri` request.
  
positive.code:         return;
        }
  
        var source = driver.fsState.getFileForPath(file).source;
        if (!source.uri.isScheme('file')) {
          uri = source.uri.toString();
        } else {
          uri = sourceFactory.pathToUri(file).toString();
        }
        sendResult(ExecutionMapUriResult(uri: uri));
        return;
      } else if (uri != null) {
        var source = sourceFactory.forUri(uri);
  
negative.code:       sendResponse(Response.invalidExecutionContext(request, contextId));
        return;
      }
  
      var sourceFactory = driver.sourceFactory;
  
      var file = params.file;
  