∀ {J : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} J] {C : Type u₃} [inst_1 : CategoryTheory.Category.{v₃, u₃} C]
  {F G : CategoryTheory.Functor J C} (α : G ≅ F),
  (CategoryTheory.Limits.Cocones.precomposeEquivalence α).functor = CategoryTheory.Limits.Cocones.precompose α.hom