Goal:
  
  __x3 : BinNums.Z
  __x2 : BinNums.Z
  __x1 : BinNums.Z
  __wit := [] : list ZMicromega.ZArithProof
  __varmap := VarMap.Branch (VarMap.Elt __x2) __x1 (VarMap.Elt __x3)
           : VarMap.t BinNums.Z
  __ff := Tauto.A Tauto.isProp
            {|
              RingMicromega.Flhs :=
                EnvRing.PEadd
                  (EnvRing.PEadd (EnvRing.PEX BinNums.xH)
                     (EnvRing.PEadd (EnvRing.PEX (BinNums.xO BinNums.xH))
                        (EnvRing.PEX (BinNums.xI BinNums.xH))))
                  (EnvRing.PEc (BinNums.Zpos BinNums.xH));
              RingMicromega.Fop := RingMicromega.OpEq;
              RingMicromega.Frhs :=
                EnvRing.PEadd
                  (EnvRing.PEadd
                     (EnvRing.PEadd (EnvRing.PEX BinNums.xH)
                        (EnvRing.PEX (BinNums.xO BinNums.xH)))
                     (EnvRing.PEX (BinNums.xI BinNums.xH)))
                  (EnvRing.PEc (BinNums.Zpos BinNums.xH))
            |} tt
       : Tauto.BFormula (RingMicromega.Formula BinNums.Z) Tauto.isProp
  ============================
   (BinInt.Z.add (BinInt.Z.add __x1 (BinInt.Z.add __x2 __x3))
      (BinNums.Zpos BinNums.xH) =
    BinInt.Z.add (BinInt.Z.add (BinInt.Z.add __x1 __x2) __x3)
      (BinNums.Zpos BinNums.xH))


DEBUG:Going to execute:
exact
(ZMicromega.ZTautoChecker_sound __ff __wit
   (eq_refl <: ZMicromega.ZTautoChecker __ff __wit = true)
   (VarMap.find BinNums.Z0 __varmap))