{C : Type u} →
  [inst : CategoryTheory.Category.{v, u} C] →
    {X : C} →
      {Y : CategoryTheory.Limits.FormalCoproduct C} →
        ((CategoryTheory.Limits.FormalCoproduct.incl C).obj X ⟶ Y) → (i : Y.I) × (X ⟶ Y.obj i)