∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] (r : HomRel C) (D : Type u_2)
  [inst_1 : CategoryTheory.Category.{v_2, u_2} D],
  ((CategoryTheory.Functor.whiskeringLeft C (CategoryTheory.Quotient r) D).obj (CategoryTheory.Quotient.functor r)).Full