IfThenElse1.bpl(28,3): Error BP5001: This assertion might not hold.
Execution trace:
    IfThenElse1.bpl(28,3): anon0
IfThenElse1.bpl(35,3): Error BP5001: This assertion might not hold.
Execution trace:
    IfThenElse1.bpl(35,3): anon0

Boogie program verifier finished with 2 verified, 2 errors