RankNeg.dfy(10,25): Error: cannot prove termination; try supplying a decreases clause
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
    (0,0): anon8_Then
RankNeg.dfy(15,27): Error: cannot prove termination; try supplying a decreases clause
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
    (0,0): anon8_Then
RankNeg.dfy(22,30): Error: cannot prove termination; try supplying a decreases clause
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
    (0,0): anon8_Then
RankNeg.dfy(32,24): Error: cannot prove termination; try supplying a decreases clause
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
    (0,0): anon8_Then

Dafny program verifier finished with 1 verified, 4 errors