∀ {B : Type u} [inst : Quiver B] [inst_1 : SizeOf B] {a b c : CategoryTheory.FreeBicategory B} (f : a ⟶ b) {g h : b ⟶ c}
  (η : CategoryTheory.FreeBicategory.Hom₂ g h),
  sizeOf (CategoryTheory.FreeBicategory.Hom₂.whisker_left f η) =
    1 + sizeOf a + sizeOf b + sizeOf c + sizeOf f + sizeOf g + sizeOf h + sizeOf η