anchor.diff:    }
   
     @override
  -  Iterable<S> findAll<S>(Offset regionOffset) sync* {
  +  Iterable<S> findAll<S>(Offset regionOffset) {
       if (!clipPath.contains(regionOffset))
  -      return;
  -    yield* super.findAll<S>(regionOffset);
  +      return Iterable<S>.empty();
  +    return super.findAll<S>(regionOffset);
     }
   
     @override
  
positive.code:                               'for more details.'),
        library: 'rendering library',
        context: ErrorDescription('during compositing'),
        informationCollector: () sync* {
          yield child.toDiagnosticsNode(name: 'Attempted to composite layer', style: DiagnosticsTreeStyle.errorProperty);
          yield predecessor.toDiagnosticsNode(name: 'after layer', style: DiagnosticsTreeStyle.errorProperty);
          yield ErrorDescription('which occupies the same area at a higher elevation.');
        }
      ));
      return <PictureLayer>[
  
negative.code:   }
  
    @override
    Iterable<S> findAll<S>(Offset regionOffset) {
      final Offset transformedOffset = _transformOffset(regionOffset);
      if (transformedOffset == null) {
        return Iterable<S>.empty();
      }
      return super.findAll<S>(transformedOffset);
    }
  
    @override
  