Goal:
  
  __x2 : BinNums.Z
  __x1 : BinNums.Z
  __wit := [] : list ZMicromega.ZArithProof
  __varmap := VarMap.Branch (VarMap.Elt __x2) __x1 VarMap.Empty
           : VarMap.t BinNums.Z
  __ff := Tauto.IMPL
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs := EnvRing.PEX BinNums.xH;
                 RingMicromega.Fop := RingMicromega.OpLe;
                 RingMicromega.Frhs := EnvRing.PEX (BinNums.xO BinNums.xH)
               |} tt) None
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs :=
                   EnvRing.PEadd (EnvRing.PEX BinNums.xH)
                     (EnvRing.PEc (BinNums.Zpos BinNums.xH));
                 RingMicromega.Fop := RingMicromega.OpLe;
                 RingMicromega.Frhs :=
                   EnvRing.PEadd (EnvRing.PEX (BinNums.xO BinNums.xH))
                     (EnvRing.PEc (BinNums.Zpos BinNums.xH))
               |} tt)
       : Tauto.BFormula (RingMicromega.Formula BinNums.Z) Tauto.isProp
  ============================
   (BinInt.Z.le __x1 __x2
    → BinInt.Z.le (BinInt.Z.add __x1 (BinNums.Zpos BinNums.xH))
        (BinInt.Z.add __x2 (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))