ComputationsNeg.dfy(7,2): Error: decreases clause might not decrease
ComputationsNeg.dfy(11,0): Error: a postcondition could not be proved on this return path
ComputationsNeg.dfy(10,16): Related location: this is the postcondition that could not be proved
ComputationsNeg.dfy(23,0): Error: a postcondition could not be proved on this return path
ComputationsNeg.dfy(22,10): Related location: this is the postcondition that could not be proved
ComputationsNeg.dfy(19,28): Related location: this proposition could not be proved
ComputationsNeg.dfy(36,12): Error: assertion might not hold
ComputationsNeg.dfy(45,12): Error: assertion might not hold

Dafny program verifier finished with 5 verified, 5 errors
