AssertVerifiedUnder0.bpl(6,5): Error BP5001: This assertion might not hold.
Execution trace:
    AssertVerifiedUnder0.bpl(6,5): anon0
AssertVerifiedUnder0.bpl(18,5): Error BP5001: This assertion might not hold.
Execution trace:
    AssertVerifiedUnder0.bpl(18,5): anon0
AssertVerifiedUnder0.bpl(31,5): Error BP5001: This assertion might not hold.
Execution trace:
    AssertVerifiedUnder0.bpl(31,5): anon0

Boogie program verifier finished with 3 verified, 3 errors