Goal:
  
  A : Type
  P : list A → A → Type
  Q : list A → list A → A → A → Type
  Γ' : list A
  d : A
  d' : A
  Γ : list A
  Γ'0 : list A
  H : All2_fold Q Γ Γ'0
  q : Q Γ Γ'0 d d'
  ============================
   ({| pr1 := []; pr2 := Γ' |} = {| pr1 := d :: Γ; pr2 := d' :: Γ'0 |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in
      All2_fold (λ (Γ Γ' : list A) (d d' : A), P Γ d × Q Γ Γ' d d') [] Γ')


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