Unchanged.dfy(33,25): Error: assertion might not hold
Unchanged.dfy(34,25): Error: assertion might not hold
Unchanged.dfy(35,25): Error: assertion might not hold
Unchanged.dfy(38,13): Error: assertion might not hold
Unchanged.dfy(46,35): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
Unchanged.dfy(47,35): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
Unchanged.dfy(48,41): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
Unchanged.dfy(49,35): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate

Dafny program verifier finished with 1 verified, 8 errors
