Back Yard
  Fido
  An Interactive Fiction
  Release 1 / Serial number 160428 / Inform 7 v10.2.0 / D
  
  Back Yard
  You can see a dog here.
  
> >   Back Yard
  (Testing.)
  
  >[1] name the dog "fido"
  The dog is now known as fido.
  
  >[2] name the dog lawrence
  The dog is now known as lawrence.
  
  >[3] look
  Back Yard
  You can see lawrence here.
  
  >[4] x lawrence
  You see nothing special about lawrence.
  
  >[5] name lawrence nothing
  You revoke your choice of dog-name.
  
  >[6] look
  Back Yard
  You can see a dog here.
  
  >[7] x lawrence
  You can't see any such thing.
  
> >