From 895121f919c6f1332f41f658ce7f850e391eb49e Mon Sep 17 00:00:00 2001
From: Yves Bertot <Yves.Bertot@inria.fr>
Date: Sat, 19 Dec 2020 22:29:40 +0100
Subject: [PATCH] need to explictely unfold decode

---
 theories/finite.v | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/theories/finite.v b/theories/finite.v
index 6bd7d4a..767a31c 100644
--- a/theories/finite.v
+++ b/theories/finite.v
@@ -64,7 +64,8 @@ Lemma find_is_Some `{finA: Finite A} P `{∀ x, Decision (P x)} (x : A) :
 Proof.
   destruct finA as [xs Hxs HA]; unfold find, decode; simpl.
   intros Hx. destruct (list_find_elem_of P xs x) as [[i y] Hi]; auto.
-  rewrite Hi; simpl. rewrite !Nat2Pos.id by done. simpl.
+  rewrite Hi. unfold decode_nat, decode. simpl. rewrite !Nat2Pos.id by done.
+  simpl.
   apply list_find_Some in Hi; naive_solver.
 Qed.
 
-- 
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