{C : Type u₁} →
  [inst : CategoryTheory.Category.{v₁, u₁} C] →
    {motive : CategoryTheory.IsRegularMonoCategory C → Sort u} →
      ((regularMonoOfMono : ∀ {X Y : C} (f : X ⟶ Y) [CategoryTheory.Mono f], CategoryTheory.IsRegularMono f) →
          motive ⋯) →
        (t : CategoryTheory.IsRegularMonoCategory C) → motive t