Goal:
  
  A : Type
  P : A → Type
  f : A → A
  x : A
  l : list A
  p : P x
  X : All P l
  IHX : (∀ x : A, P x → f x = x) → map f l = l
  H : ∀ x : A, P x → f x = x
  ============================
   (map f l = l)


DEBUG:Going to execute:
exact (id0 id1)
DEBUG LTAC Evaluated term: (map f l = l)