∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] {X : C},
  CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.id X) (CategoryTheory.CategoryStruct.id X) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.CategoryStruct.id X) (CategoryTheory.CategoryStruct.id X)