∀ {C : Type u_1} [inst : CategoryTheory.EnrichedCategory CategoryTheory.Cat C] {a b : CategoryTheory.CatEnriched C}
  {f f' : a ⟶ b} (η : f ⟶ f'),
  (CategoryTheory.CatEnriched.hComp (CategoryTheory.CategoryStruct.id (CategoryTheory.CategoryStruct.id a)) η ≍ η) =
    True