∀ {B : Type u_3} [inst : CategoryTheory.Bicategory B] (a : B),
  CategoryTheory.Bicategory.rightZigzag (CategoryTheory.Bicategory.rightUnitor (CategoryTheory.CategoryStruct.id a)).inv
      (CategoryTheory.Bicategory.rightUnitor (CategoryTheory.CategoryStruct.id a)).hom =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Bicategory.rightUnitor (CategoryTheory.CategoryStruct.id a)).hom
      (CategoryTheory.Bicategory.leftUnitor (CategoryTheory.CategoryStruct.id a)).inv