Goal:
    z : Z  H : False \/ False  H0 : False
  ============================
   False


DEBUG:Going to execute:
<coq-core.plugins.ltac::clear@0> $1

Goals:
    z : Z  H0 : False
  ============================
   False

    z : Z  H0 : False
  ============================
   False


DEBUG:Going to execute:
<Coq.Init.Tauto.not_dep_intros>

Goals:
    z : Z  H0 : False
  ============================
   False

    z : Z  H0 : False
  ============================
   False


DEBUG:Going to execute:
repeat
            match goal with
            | |- ?X1 -> ?X2 => intro
            | |- ~ _ => unfold not at 1; intro
            end