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15 lines
386 B
Agda
15 lines
386 B
Agda
module FFI.Data.Maybe where
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open import Agda.Builtin.Equality using (_≡_; refl)
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{-# FOREIGN GHC import qualified Data.Maybe #-}
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data Maybe (A : Set) : Set where
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nothing : Maybe A
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just : A → Maybe A
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{-# COMPILE GHC Maybe = data Data.Maybe.Maybe (Data.Maybe.Nothing|Data.Maybe.Just) #-}
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just-inv : ∀ {A} {x y : A} → (just x ≡ just y) → (x ≡ y)
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just-inv refl = refl
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