From 0411c7e08b58edc4785c2be396fad0a037056a11 Mon Sep 17 00:00:00 2001
From: Pierre-Marie Pédrot
Date: Thu, 13 Jul 2017 18:26:44 +0200
Subject: Removing a use of AUContext.instance in the STM.

We only delay monomorphic proofs in quick mode, so that their universe context
will always be empty.
---
 stm/stm.ml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/stm/stm.ml b/stm/stm.ml
index d38491fec2..7c96208546 100644
--- a/stm/stm.ml
+++ b/stm/stm.ml
@@ -1576,7 +1576,8 @@ end = struct (* {{{ *)
         let uc =
           Option.get
             (Opaqueproof.get_constraints (Global.opaque_tables ()) o) in
-        let map (c, ctx) = Vars.subst_instance_constr (Univ.AUContext.instance ctx) c in
+        (** We only manipulate monomorphic terms here. *)
+        let map (c, ctx) = assert (Univ.AUContext.is_empty ctx); c in
         let pr =
           Future.from_val (map (Option.get (Global.body_of_constant_body c))) in
         let uc =
-- 
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