∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  (S : D) (T : CategoryTheory.Functor C D) (X : CategoryTheory.Comma (CategoryTheory.Functor.fromPUnit S) T),
  (CategoryTheory.StructuredArrow.proj S T).obj X = X.right