Goal:
  
  __x2 : BinNums.Z
  __x1 : BinNums.Z
  __wit := [ZMicromega.RatProof
              (RingMicromega.PsatzAdd
                 (RingMicromega.PsatzMulC
                    (EnvRing.Pc (BinNums.Zneg BinNums.xH))
                    (RingMicromega.PsatzIn BinNums.Z 1))
                 (RingMicromega.PsatzIn BinNums.Z 0)) ZMicromega.DoneProof]
        : 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.OpEq;
                 RingMicromega.Frhs := EnvRing.PEX (BinNums.xO BinNums.xH)
               |} tt) None
            (Tauto.A Tauto.isProp
               {|
                 RingMicromega.Flhs := EnvRing.PEX BinNums.xH;
                 RingMicromega.Fop := RingMicromega.OpEq;
                 RingMicromega.Frhs := EnvRing.PEX (BinNums.xO BinNums.xH)
               |} tt)
       : Tauto.BFormula (RingMicromega.Formula BinNums.Z) Tauto.isProp
  ============================
   (__x1 = __x2 → __x1 = __x2)


DEBUG:Going to execute:
<coq-core.plugins.ltac::exact@0> $1