∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] {G : CategoryTheory.Comonad C} {W X Y Z : G.Coalgebra}
  (f : W ⟶ X) (g : X ⟶ Y) (h : Y ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.comp f g) h =
    CategoryTheory.CategoryStruct.comp f (CategoryTheory.CategoryStruct.comp g h)