Goal:
  
  __p1 : Prop
  __x2 : Z
  __x1 : Z
  __wit := [] : list ZMicromega.ZArithProof
  __varmap := VarMap.Branch
                (VarMap.Branch (VarMap.Elt __x2) __x2 VarMap.Empty) __x1
                VarMap.Empty : VarMap.t Z
  __ff := Tauto.IMPL
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs :=
                   EnvRing.PEadd
                     (EnvRing.PEadd
                        (EnvRing.PEsub (EnvRing.PEX 1) (EnvRing.PEX 4))
                        (EnvRing.PEc 1)) (EnvRing.PEX 4);
                 RingMicromega.Fop := RingMicromega.OpLe;
                 RingMicromega.Frhs := EnvRing.PEX 1
               |} tt) None (Tauto.X Tauto.isProp __p1)
       : Tauto.BFormula (RingMicromega.Formula Z) Tauto.isProp
  ============================
   (__x1 - __x2 + 1 + __x2 <= __x1 -> __p1)


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