Goal:
  
  A : Type
  p : A → bool
  q : A → bool
  l : list A
  H0 : ∀ x : A, In x l → p x ↔ q x
  ============================
   (Forall (λ x : A, In x l) l)


DEBUG:Going to execute:
apply Forall_forall
DEBUG LTAC Evaluated term: (λ x : A, In x l)
DEBUG LTAC Evaluated term: Forall_forallb_eq_forallb