anchor.diff:  // Use of this source code is governed by a BSD-style license that can be
   // found in the LICENSE file.
   
  -import 'dart:math';
  +import 'dart:math' as math;
   
   import 'package:flutter/gestures.dart';
   import 'package:flutter/rendering.dart';
  
positive.code:       );
      }
      return SliverList(delegate: childrenDelegate);
    }
  }
  
  
negative.code: import 'overlay.dart';
  import 'scroll_controller.dart';
  import 'scroll_physics.dart';
  import 'scroll_view.dart';
  import 'scrollable.dart';
  import 'sliver.dart';
  