∀ (W : Type v') [inst : CategoryTheory.Category.{w', v'} W] [inst_1 : CategoryTheory.MonoidalCategory W] (C : Type u₁)
  [inst_2 : CategoryTheory.EnrichedCategory W C] (X : CategoryTheory.ForgetEnrichment W C),
  (CategoryTheory.EnrichedFunctor.forgetId W C).inv.app X = CategoryTheory.CategoryStruct.id X