LabelsOldAt.dfy(429,9): Warning: Argument to 'old' does not dereference the mutable heap, so this use of 'old' has no effect
LabelsOldAt.dfy(430,9): Warning: Argument to 'old' does not dereference the mutable heap, so this use of 'old' has no effect
LabelsOldAt.dfy(160,13): Warning: Argument to 'old' does not dereference the mutable heap, so this use of 'old' has no effect
LabelsOldAt.dfy(34,13): Error: assertion might not hold
LabelsOldAt.dfy(56,11): Error: assertion might not hold
LabelsOldAt.dfy(78,13): Error: assertion might not hold
LabelsOldAt.dfy(110,13): Error: assertion might not hold
LabelsOldAt.dfy(112,13): Error: assertion might not hold
LabelsOldAt.dfy(116,13): Error: assertion might not hold
LabelsOldAt.dfy(118,13): Error: assertion might not hold
LabelsOldAt.dfy(140,13): Error: assertion might not hold
LabelsOldAt.dfy(142,13): Error: assertion might not hold
LabelsOldAt.dfy(164,21): Error: receiver could not be proved to be allocated in the state in which its fields are accessed
LabelsOldAt.dfy(166,27): Error: receiver could not be proved to be allocated in the state in which its fields are accessed
LabelsOldAt.dfy(175,19): Error: array could not be proved to be allocated
LabelsOldAt.dfy(177,25): Error: array could not be proved to be allocated
LabelsOldAt.dfy(195,25): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(197,31): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(207,31): Error: some set element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(236,14): Error: receiver could not be proved to be allocated in the state in which its fields are accessed
LabelsOldAt.dfy(244,29): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(246,29): Error: some set element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(266,15): Error: object might be null
LabelsOldAt.dfy(267,15): Error: some set element might be null
LabelsOldAt.dfy(268,15): Error: some sequence element might be null
LabelsOldAt.dfy(274,15): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(275,15): Error: some set element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(276,15): Error: some sequence element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(281,15): Error: object could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(281,15): Error: object might be null
LabelsOldAt.dfy(286,15): Error: some set element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(286,15): Error: some set element might be null
LabelsOldAt.dfy(291,15): Error: some sequence element could not be proved to be allocated in the old-state of the 'unchanged' predicate
LabelsOldAt.dfy(291,15): Error: some sequence element might be null
LabelsOldAt.dfy(358,11): Error: assertion might not hold
LabelsOldAt.dfy(367,11): Error: assertion might not hold
LabelsOldAt.dfy(376,11): Error: assertion might not hold
LabelsOldAt.dfy(385,11): Error: assertion might not hold

Dafny program verifier finished with 28 verified, 35 errors
