Goal:
    __x1 : Z
  ============================
   (let __wit := [] in
    let __varmap := VarMap.Elt __x1 in
    let __ff :=
      Tauto.A Tauto.isProp
        {|
          RingMicromega.Flhs := EnvRing.PEX 1;
          RingMicromega.Fop := RingMicromega.OpEq;
          RingMicromega.Frhs := EnvRing.PEsub (EnvRing.PEX 1) (EnvRing.PEc 0)
        |} tt in
    __x1 = __x1 - 0)


DEBUG:Going to execute:
zchecker