∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  {F : CategoryTheory.Functor C D},
  autoParam (∀ {X Y : C}, Function.Injective F.map) CategoryTheory.Functor.Faithful.map_injective._autoParam →
    F.Faithful