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MultiSets.dfy(159,3): Error BP5003: A postcondition might not hold on this return path.
MultiSets.dfy(158,15): Related location: This is the postcondition that might not hold.
Execution trace:
(0,0): anon0
MultiSets.dfy(165,3): Error BP5003: A postcondition might not hold on this return path.
MultiSets.dfy(164,15): Related location: This is the postcondition that might not hold.
Execution trace:
(0,0): anon0
MultiSets.dfy(178,11): Error: new number of occurrences might be negative
Execution trace:
(0,0): anon0
(0,0): anon4_Then
(0,0): anon3
MultiSets.dfy(269,24): Error: assertion violation
Execution trace:
(0,0): anon0
(0,0): anon11_Then
(0,0): anon3
(0,0): anon12_Then
(0,0): anon14_Else
Dafny program verifier finished with 54 verified, 4 errors
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