∀ {B : Type u} [inst : CategoryTheory.Bicategory B] {a b c : B} (f : a ⟶ b) (g : b ⟶ c),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Bicategory.whiskerLeft f (CategoryTheory.Bicategory.leftUnitor g).inv)
      (CategoryTheory.Bicategory.associator f (CategoryTheory.CategoryStruct.id b) g).inv =
    CategoryTheory.Bicategory.whiskerRight (CategoryTheory.Bicategory.rightUnitor f).inv g