Goal:
    __x1 : BinNums.Z
  ============================
   (let __wit := [] in
    let __varmap := VarMap.Elt __x1 in
    let __ff :=
      Tauto.A Tauto.isProp
        {|
          RingMicromega.Flhs :=
            EnvRing.PEadd (EnvRing.PEX BinNums.xH)
              (EnvRing.PEc (BinNums.Zpos BinNums.xH));
          RingMicromega.Fop := RingMicromega.OpEq;
          RingMicromega.Frhs :=
            EnvRing.PEadd (EnvRing.PEX BinNums.xH)
              (EnvRing.PEc (BinNums.Zpos BinNums.xH))
        |} tt in
    BinInt.Z.add __x1 (BinNums.Zpos BinNums.xH) =
    BinInt.Z.add __x1 (BinNums.Zpos BinNums.xH))


DEBUG:Going to execute:
zchecker