CodeExpr0.bpl(17,3): Error BP5001: This assertion might not hold.
Execution trace:
    CodeExpr0.bpl(17,3): anon0
CodeExpr0.bpl(22,3): Error BP5001: This assertion might not hold.
Execution trace:
    CodeExpr0.bpl(22,3): anon0
CodeExpr0.bpl(54,3): Error BP5001: This assertion might not hold.
Execution trace:
    CodeExpr0.bpl(54,3): anon0

Boogie program verifier finished with 3 verified, 3 errors