From 0df83ac03dcc81b9efe99f6bcdce16aff124bba4 Mon Sep 17 00:00:00 2001
From: Hoang-Hai Dang <haidang@mpi-sws.org>
Date: Thu, 20 Jun 2019 15:23:17 +0200
Subject: [PATCH] Make proof clear.

---
 theories/program_logic/language.v | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/theories/program_logic/language.v b/theories/program_logic/language.v
index 60d95f5b9..d8d4b39cf 100644
--- a/theories/program_logic/language.v
+++ b/theories/program_logic/language.v
@@ -163,9 +163,7 @@ Section language.
 
   Lemma stuck_fill `{!@LanguageCtx Λ K} e σ :
     stuck e σ → stuck (K e) σ.
-  Proof.
-    intros ST. split; [by apply fill_not_val, ST|apply irreducible_fill; apply ST].
-  Qed.
+  Proof. intros [??]. split. by apply fill_not_val. by apply irreducible_fill. Qed.
 
   Lemma step_Permutation (t1 t1' t2 : list (expr Λ)) κ σ1 σ2 :
     t1 ≡ₚ t1' → step (t1,σ1) κ (t2,σ2) → ∃ t2', t2 ≡ₚ t2' ∧ step (t1',σ1) κ (t2',σ2).
-- 
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