⚠️ Archived site. This is the pre-3.0 Agda Universal Algebra Library, preserved for reference. Its current home is agda-algebras.universalalgebra.org (as of July 2026).

------------------------------------------------------------------------ -- The Agda standard library -- -- Empty values (e.g. [] for List, nothing for Maybe) ------------------------------------------------------------------------ {-# OPTIONS --cubical-compatible --safe #-} module Effect.Empty where open import Level private variable ℓ ℓ′ : Level A : Set ℓ record RawEmpty (F : Set ℓ → Set ℓ′) : Set (suc ℓ ⊔ ℓ′) where field empty : F A -- backwards compatibility: unicode variants ∅ : F A ∅ = empty