∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] {X Y : C} (e : X ≅ Y)
  (s : CategoryTheory.Limits.Cofork (CategoryTheory.CategoryStruct.id X) (CategoryTheory.CategoryStruct.id X)),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.Cofork.ofπ e.hom ⋯).π
      ((fun s => CategoryTheory.CategoryStruct.comp e.inv s.π) s) =
    s.π