ContractEvaluationOrder.bpl(10,1): Error BP5003: A postcondition might not hold on this return path.
ContractEvaluationOrder.bpl(5,3): Related location: This is the postcondition that might not hold.
Execution trace:
    ContractEvaluationOrder.bpl(9,5): anon0
ContractEvaluationOrder.bpl(17,3): Error BP5001: This assertion might not hold.
Execution trace:
    ContractEvaluationOrder.bpl(14,5): anon0
ContractEvaluationOrder.bpl(26,3): Error BP5002: A precondition for this call might not hold.
ContractEvaluationOrder.bpl(32,3): Related location: This is the precondition that might not hold.
Execution trace:
    ContractEvaluationOrder.bpl(25,5): anon0

Boogie program verifier finished with 1 verified, 3 errors