RankNeg.dfy(10,25): Error: cannot prove termination; try supplying a decreases clause
RankNeg.dfy(15,27): Error: cannot prove termination; try supplying a decreases clause
RankNeg.dfy(22,30): Error: cannot prove termination; try supplying a decreases clause
RankNeg.dfy(32,24): Error: cannot prove termination; try supplying a decreases clause

Dafny program verifier finished with 1 verified, 4 errors
