Goal:
  
  __p1 : Prop
  __x1 : Z
  __wit := nil : list ZMicromega.ZArithProof
  __varmap := VarMap.Elt __x1 : VarMap.t Z
  __ff := Tauto.IMPL
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs := EnvRing.PEc 0%Z;
                 RingMicromega.Fop := RingMicromega.OpLe;
                 RingMicromega.Frhs := EnvRing.PEX 1
               |} tt) None
            (Tauto.IMPL
               (Tauto.A Tauto.isProp
                  {|
                    RingMicromega.Flhs := EnvRing.PEX 1;
                    RingMicromega.Fop := RingMicromega.OpLt;
                    RingMicromega.Frhs := EnvRing.PEc 0%Z
                  |} tt) None (Tauto.X Tauto.isProp __p1))
       : Tauto.BFormula (RingMicromega.Formula Z) Tauto.isProp
  ============================
   ((0 <= __x1)%Z -> (__x1 < 0)%Z -> __p1)


DEBUG:Going to execute:
exact
(ZMicromega.ZTautoChecker_sound __ff __wit
   (eq_refl <: ZMicromega.ZTautoChecker __ff __wit = true)
   (VarMap.find 0%Z __varmap))