Arrays.bpl(50,5): Error BP5003: A postcondition might not hold on this return path.
Arrays.bpl(42,3): Related location: This is the postcondition that might not hold.
Execution trace:
    Arrays.bpl(46,3): start
Arrays.bpl(131,5): Error BP5003: A postcondition might not hold on this return path.
Arrays.bpl(123,3): Related location: This is the postcondition that might not hold.
Execution trace:
    Arrays.bpl(127,3): start

Boogie program verifier finished with 8 verified, 2 errors