MAYBE

'Pop* (timeout of 60.0 seconds)'
--------------------------------
Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  rev(xs) -> revtl(xs, nil())
     , revtl(nil(), ys) -> ys
     , revtl(cons(x, xs), ys) -> revtl(xs, cons(x, ys))}

Proof Output:    
  The input cannot be shown compatible