Goal:
    __x3 : BinNums.Z  __x2 : BinNums.Z  __x1 : BinNums.Z
  ============================
   (let __wit := [] in
    let __varmap := VarMap.Branch (VarMap.Elt __x2) __x1 (VarMap.Elt __x3) in
    let __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 in
    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:
let __ff := fresh "__ff" in
           intros __wit __varmap __ff; exact
            (ZMicromega.ZTautoChecker_sound __ff __wit
               (eq_refl <: ZMicromega.ZTautoChecker __ff __wit = true)
               (VarMap.find BinNums.Z0 __varmap))