Goal:
  
  A : Type
  f : nat → A
  m : nat
  IHm : BinInt.Z.of_nat #|unfold m f| = BinInt.Z.of_nat m
  cstr : BinInt.Z.le BinNums.Z0 (BinInt.Z.of_nat m)
  cstr0 : BinInt.Z.le BinNums.Z0 (BinInt.Z.of_nat #|unfold m f|)
  ============================
   (BinInt.Z.add (BinInt.Z.of_nat #|unfold m f|) (BinNums.Zpos BinNums.xH) =
    BinInt.Z.add (BinInt.Z.of_nat m) (BinNums.Zpos BinNums.xH))


DEBUG:Going to execute:
idtac