anchor.diff:          ),
         ),
       );
  -    return currentDisconnectedOverlay;
  +    return currentDisconnectedOverlay!;
     }
   
     @override
  
positive.code: // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // @dart=2.9
  
  import 'dart:async';
  
  
negative.code:       return;
      }
  
      final uri = normalizeVmServiceUri(widget.url!);
      final connected = await FrameworkCore.initVmService(
        '',
        explicitUri: uri,
        errorReporter: (message, error) =>
            Notifications.of(context)!.push('$message, $error'),
      );
  
      if (!connected) {
  