∀ {C : Type u_1} {inst : CategoryTheory.Category.{v_1, u_1} C} {FC : outParam (C → C → Type u_2)}
  {CC : outParam (C → Type w)} {inst_1 : outParam ((X Y : C) → FunLike (FC X Y) (CC X) (CC Y))}
  {inst_2 : CategoryTheory.ConcreteCategory C FC} {D : Type u_3} {inst_3 : CategoryTheory.Category.{v_2, u_3} D}
  {FD : outParam (D → D → Type u_4)} {CD : outParam (D → Type w)}
  {inst_4 : outParam ((X Y : D) → FunLike (FD X Y) (CD X) (CD Y))} {inst_5 : CategoryTheory.ConcreteCategory D FD}
  [self : CategoryTheory.HasForget₂ C D],
  CategoryTheory.HasForget₂.forget₂.comp (CategoryTheory.forget D) = CategoryTheory.forget C