Goal:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  H1 : list A
  ============================
   (All Q H1
    → hd :: tl = H1
      → let H := CoreTactics.block in
        let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
intros p

Goals:
  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  hd' : A
  tl : list A
  p : P hd hd'
  H1 : list A
  H : All Q H1
  ============================
   (hd :: tl = H1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All Q (hd' :: tl))

  
  A : Type
  P : A → A → Type
  Q : A → Type
  HPQ : ∀ x y : A, Q x → P x y → Q y
  hd : A
  tl : list A
  tl' : list A
  X : OnOne2 P tl tl'
  IHX : All Q tl → All Q tl'
  H1 : list A
  H : All Q H1
  ============================
   (hd :: tl = H1
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
DepElim.elim_case p || destruct p || (case p; clear p)