∀ {V : Type v} [inst : CategoryTheory.Category.{w, v} V] [inst_1 : CategoryTheory.MonoidalCategory V] {C : Type u₁}
  [inst_2 : CategoryTheory.EnrichedCategory V C] {D : Type u₂} [inst_3 : CategoryTheory.EnrichedCategory V D]
  (self : CategoryTheory.EnrichedFunctor V C D) (X : C),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.eId V X) (self.map X X) = CategoryTheory.eId V (self.obj X)