Goal:
  
  A : Type
  B : Type
  P : B → A → A → Type
  Q : A → Type
  HPQ : ∀ (i : B) (x y : A), Q x → P i x y → Q y
  b : B
  bs : list B
  hd : A
  hd' : A
  tl : list A
  p : P b hd hd'
  q : Q hd
  H : All Q tl
  e : BinInt.Z.of_nat #|bs| = BinInt.Z.of_nat #|tl|
  cstr : BinInt.Z.le BinNums.Z0 (BinInt.Z.of_nat #|tl|)
  cstr0 : BinInt.Z.le BinNums.Z0 (BinInt.Z.of_nat #|bs|)
  ============================
   (P ?i hd hd')


DEBUG:Going to execute:
lazymatch Zify.zify_convert_to_euclidean_division_equations_flag
           with
           | true =>
               Zify.zify_internal_to_euclidean_division_equations
           | false => idtac
           end