Commit a5e657c3 authored by Robbert Krebbers's avatar Robbert Krebbers
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Lemma for inclusion of dec_agree.

parent db2eced3
......@@ -15,6 +15,8 @@ Instance maybe_DecAgree {A} : Maybe (@DecAgree A) := λ x,
Section dec_agree.
Context `{EqDecision A}.
Implicit Types a b : A.
Implicit Types x y : dec_agree A.
Instance dec_agree_valid : Valid (dec_agree A) := λ x,
if x is DecAgree _ then True else False.
......@@ -56,6 +58,9 @@ Proof. destruct x; by rewrite /= ?decide_True. Qed.
Lemma dec_agree_op_inv (x1 x2 : dec_agree A) : (x1 x2) x1 = x2.
Proof. destruct x1, x2; by repeat (simplify_eq/= || case_match). Qed.
Lemma DecAgree_included a b : DecAgree a DecAgree b a = b.
Proof. intros [[c|] [=]%leibniz_equiv_iff]. by simplify_option_eq. Qed.
End dec_agree.
Arguments dec_agreeC : clear implicits.
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