∀ {𝒮 : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} 𝒮]
  {F : CategoryTheory.Pseudofunctor (CategoryTheory.LocallyDiscrete 𝒮ᵒᵖ) CategoryTheory.Cat},
  (CategoryTheory.Pseudofunctor.CoGrothendieck.forget F).IsFibered