anchor.diff:  // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
   
  -// @dart=2.9
  +// ignore_for_file: import_of_legacy_library_into_null_safe
   
   import 'dart:async';
   import 'dart:math' as math;
  
positive.code:     }
    }
    if (screen.requiresDartVm) {
      if (!serviceManager.connectedApp.isRunningOnDartVM) {
        return false;
      }
    }
    if (screen.requiresDebugBuild) {
      if (serviceManager.connectedApp.isProfileBuildNow) {
        return false;
      }
    }
  
negative.code:   });
  
    const Screen.conditional({
      required String id,
      String? requiresLibrary,
      bool requiresDartVm = false,
      bool requiresDebugBuild = false,
      bool requiresVmDeveloperMode = false,
      bool worksOffline = false,
      bool Function(FlutterVersion? currentVersion)? shouldShowForFlutterVersion,
      bool showFloatingDebuggerControls = true,
      String title = '',
      IconData? icon,
      Key? tabKey,
    }) : this(
            id,
            requiresLibrary: requiresLibrary,
  