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'
  x : A
  l : list A
  q : Q x
  H : All Q l
  ============================
   (hd :: tl = x :: l
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All Q (hd :: tl'))


DEBUG:Going to execute:
simplify * || simplify ?