∀ {T : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} T] {X : T} (hX : CategoryTheory.Limits.IsTerminal X)
  (X_1 : T),
  CategoryTheory.Over.homMk (CategoryTheory.CategoryStruct.id X_1) ⋯ =
    CategoryTheory.CategoryStruct.id (CategoryTheory.Over.mk (hX.from X_1))