content: sub main()
      m.foo = "bar"
      print m.foo
      changeM()
      print m.foo
      aa = {
      printM: printM,
      changeM: changeM
      }
      aa.printM()
      aa.changeM()
      aa.printM()
      print m.abc
      print m.foo
  end sub
  
  sub changeM()
      m = 1
      print m + 1
  end sub
  
  sub printM()
      if m.abc = invalid
          m.abc = "abc"
      else
          m.abc += "def"
      end if
      print m.abc
  end sub
  