Goal:
    __x1 : Z
  ============================
   (let __wit := nil in
    let __varmap := VarMap.Elt __x1 in
    let __ff :=
      Tauto.A Tauto.isProp
        {|
          RingMicromega.Flhs :=
            EnvRing.PEadd (EnvRing.PEX 1) (EnvRing.PEc 1%Z);
          RingMicromega.Fop := RingMicromega.OpEq;
          RingMicromega.Frhs :=
            EnvRing.PEadd (EnvRing.PEX 1) (EnvRing.PEc 1%Z)
        |} tt in
    (__x1 + 1)%Z = (__x1 + 1)%Z)


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