∀ {B : Type u_1} {C : Type u_2} [inst : CategoryTheory.Bicategory C] {F : B → C}
  {X Y : CategoryTheory.Bicategory.InducedBicategory C F} (a : X ⟶ Y),
  CategoryTheory.Bicategory.InducedBicategory.forget.map a = a.hom