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mietek/MaybeBug.agda

Created March 6, 2017 15:20
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MaybeBug.agda
open import Data.Maybe using (Maybe ; just)
open import Relation.Binary.PropositionalEquality using (_≡_ ; refl)
bad₁ : {A : Set} {x y : A} → (just x) ≡ (just y) → x ≡ y
bad₁ p = {!!}
bad₂ : ∀ {a} {A : Set a} {x y : A} → (just x) ≡ (just y) → x ≡ y
bad₂ p = {!!}
good₁ : {A : Set} {x y : A} → (Maybe.just x) ≡ (Maybe.just y) → x ≡ y
good₁ refl = refl
good₂ : ∀ {a} {A : Set a} {x y : A} → (Maybe.just x) ≡ (Maybe.just y) → x ≡ y
good₂ refl = refl
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