∀ {J : Type u_3} [inst : CategoryTheory.Category.{u_2, u_3} J] (F : CategoryTheory.Functor J (Type u_1))
  [inst_1 : Small.{u_1, max u_1 u_3} ↑F.sections] (j j' : J) (f : j ⟶ j'),
  (CategoryTheory.CategoryStruct.comp
      (((CategoryTheory.Functor.const J).obj (Shrink.{u_1, max u_1 u_3} ↑F.sections)).map f) fun u =>
      ↑((equivShrink ↑F.sections).symm u) j') =
    CategoryTheory.CategoryStruct.comp (fun u => ↑((equivShrink ↑F.sections).symm u) j) (F.map f)