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Commit 364f5410 authored by Robbert Krebbers's avatar Robbert Krebbers
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Remove duplicate None decider.

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theories/option.v
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...@@ -68,8 +68,6 @@ Definition Some_dec {A} (x : option A) : { a | x = Some a } + { x = None } := ...@@ -68,8 +68,6 @@ Definition Some_dec {A} (x : option A) : { a | x = Some a } + { x = None } :=
| Some a => inleft (a ↾ eq_refl _) | Some a => inleft (a ↾ eq_refl _)
| None => inright eq_refl | None => inright eq_refl
end. end.
Instance None_dec {A} (x : option A) : Decision (x = None) :=
match x with Some x => right (Some_ne_None x) | None => left eq_refl end.
Lemma eq_None_not_Some {A} (x : option A) : x = None ↔ ¬is_Some x. Lemma eq_None_not_Some {A} (x : option A) : x = None ↔ ¬is_Some x.
Proof. destruct x; unfold is_Some; naive_solver. Qed. Proof. destruct x; unfold is_Some; naive_solver. Qed.
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