Goal:
  
  A : Type
  P : list A → Type
  X : P []
  X0 : ∀ (x : A) (l : list A), P l → P (l ++ [x])
  l : list A
  ============================
   (List.rev (List.rev l) = l → P l)


DEBUG:Going to execute:
intros E
DEBUG LTAC Evaluated term: (rev_involutive l)