∀ {𝒮 : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} 𝒮]
  (F : CategoryTheory.Pseudofunctor (CategoryTheory.LocallyDiscrete 𝒮) CategoryTheory.Cat) (X : F.Grothendieck),
  (CategoryTheory.Pseudofunctor.Grothendieck.forget F).obj X = X.base