anchor.diff:  
   // Simple example of calling WinRT APIs
   
  +import 'dart:ffi';
  +
  +import 'package:ffi/ffi.dart';
   import 'package:win32/win32.dart';
   
   String calendarData(ICalendar calendar) =>
  
positive.code:     'Day of Month: ${calendar.DayAsPaddedString(2)}\n'
      'Day of Week: ${calendar.DayOfWeekAsFullSoloString()}\n'
      'Year: ${calendar.YearAsString()}\n';
  
  void main() {
    winrtInitialize();
  
negative.code: 
      free(comObject);
      free(clonedCalendar.ptr);
      free(vectorView.ptr);
      free(pArray);
    } finally {
      WindowsDeleteString(japaneseCalendar);
      WindowsDeleteString(hebrewCalendar);
  