Goal:
    A : Type  p : A → bool  l : list A
  ============================
   (forallb p l → Forall (λ x : A, p x) l)


DEBUG:Going to execute:
induction l

Goals:
    A : Type  p : A → bool
  ============================
   (forallb p [] → Forall (λ x : A, p x) [])

  
  A : Type
  p : A → bool
  a : A
  l : list A
  IHl : forallb p l → Forall (λ x : A, p x) l
  ============================
   (forallb p (a :: l) → Forall (λ x : A, p x) (a :: l))


DEBUG:Going to execute:
rewrite /= //
DEBUG LTAC Evaluated term: l