Goal:
    x : Z  y : Z  z : Z  H : (x <= y)%Z  H0 : (y <= z)%Z
  ============================
   (x <= z)%Z


DEBUG:Going to execute:
fun flags =>
             match reverse goal with
             | |- ?X1 =>
                   <Coq.Init.Tauto.is_unit_or_eq> flags X1; constructor 1
             | H:?X1 |- _ => <Coq.Init.Tauto.is_empty> flags X1; elim H
             | _ => Ltac.assumption
             end