From 9bd403ec1b6cedf0542e193774a7af52b27c0a1b Mon Sep 17 00:00:00 2001
From: Gaëtan Gilbert
Date: Wed, 7 Nov 2018 15:25:59 +0100
Subject: Fix #8908: incorrect refresh of algebraic universes.

---
 engine/uState.ml | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'engine/uState.ml')

diff --git a/engine/uState.ml b/engine/uState.ml
index 41905feab7..dc760e7f97 100644
--- a/engine/uState.ml
+++ b/engine/uState.ml
@@ -577,6 +577,9 @@ let make_flexible_variable ctx ~algebraic u =
   {ctx with uctx_univ_variables = uvars'; 
       uctx_univ_algebraic = avars'}
 
+let make_nonalgebraic_variable ctx u =
+  { ctx with uctx_univ_algebraic = Univ.LSet.remove u ctx.uctx_univ_algebraic }
+
 let make_flexible_nonalgebraic ctx =
   {ctx with uctx_univ_algebraic = Univ.LSet.empty}
 
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