Commit acb221eb authored by Robbert Krebbers's avatar Robbert Krebbers
Browse files

Generalize lemma `option_guard_False`.

parent 0160850a
......@@ -345,8 +345,8 @@ Lemma option_guard_True_pi {A} P `{Decision P, ProofIrrel P} (f : P → option A
(HP : P) :
mguard P f = f HP.
Proof. intros. case_option_guard; [|done]. f_equal; apply proof_irrel. Qed.
Lemma option_guard_False {A} P `{Decision P} (mx : option A) :
¬P (guard P; mx) = None.
Lemma option_guard_False {A} P `{Decision P} (f : P option A) :
¬P mguard P f = None.
Proof. intros. by case_option_guard. Qed.
Lemma option_guard_iff {A} P Q `{Decision P, Decision Q} (mx : option A) :
(P Q) (guard P; mx) = guard Q; mx.
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