From e49ecf90e565b9e49f114cadb6b24ab660cd02f3 Mon Sep 17 00:00:00 2001
From: Gaëtan Gilbert
Date: Fri, 7 Jun 2019 15:42:39 +0200
Subject: Fix #9455: avoid update_global_env when unchanged Global.universes()

This also makes vernacentries correct wrt update_global_env.
---
 vernac/vernacentries.ml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'vernac')

diff --git a/vernac/vernacentries.ml b/vernac/vernacentries.ml
index d206165e88..d52fe480ef 100644
--- a/vernac/vernacentries.ml
+++ b/vernac/vernacentries.ml
@@ -2755,7 +2755,10 @@ and vernac_load ~verbosely ~st fname =
 
 and interp_control ?proof ~st v = match v with
   | { v=VernacExpr (atts, cmd) } ->
-    interp_expr ?proof ~atts ~st cmd
+    let before_univs = Global.universes () in
+    let pstack = interp_expr ?proof ~atts ~st cmd in
+    if before_univs == Global.universes () then pstack
+    else Option.map (Lemmas.Stack.map_top_pstate ~f:Proof_global.update_global_env) pstack
   | { v=VernacFail v } ->
     with_fail ~st (fun () -> interp_control ?proof ~st v);
     st.Vernacstate.lemmas
-- 
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