ByMethod.dfy(38,18): Error: this invariant could not be proved to be maintained by the loop
 Related message: loop invariant violation
ByMethod.dfy(42,4): Error: a postcondition could not be proved on this return path
ByMethod.dfy(35,4): Related location: this is the postcondition that could not be proved
ByMethod.dfy(47,11): Error: a postcondition could not be proved on this return path
ByMethod.dfy(48,12): Related location: this is the postcondition that could not be proved
ByMethod.dfy(55,11): Error: a postcondition could not be proved on this return path
ByMethod.dfy(56,12): Related location: this is the postcondition that could not be proved
ByMethod.dfy(60,4): Error: a postcondition could not be proved on this return path
ByMethod.dfy(59,4): Related location: this is the postcondition that could not be proved
ByMethod.dfy(63,12): Error: a postcondition could not be proved on this return path
ByMethod.dfy(64,27): Related location: this is the postcondition that could not be proved
ByMethod.dfy(68,4): Error: a postcondition could not be proved on this return path
ByMethod.dfy(67,4): Related location: this is the postcondition that could not be proved
ByMethod.dfy(71,12): Error: a postcondition could not be proved on this return path
ByMethod.dfy(72,27): Related location: this is the postcondition that could not be proved
ByMethod.dfy(93,11): Error: decreases clause might not decrease
ByMethod.dfy(102,11): Error: decreases clause might not decrease
ByMethod.dfy(111,11): Error: decreases clause might not decrease
ByMethod.dfy(126,10): Error: cannot prove termination; try supplying a decreases clause
ByMethod.dfy(132,13): Error: cannot prove termination; try supplying a decreases clause
ByMethod.dfy(148,11): Error: cannot prove termination; try supplying a decreases clause
ByMethod.dfy(152,13): Error: cannot prove termination; try supplying a decreases clause
ByMethod.dfy(175,13): Error: decreases clause might not decrease

Dafny program verifier finished with 15 verified, 16 errors
