From 993c58fde3a85c27f52f094002ec57dabca81028 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 15 Jun 2020 12:01:36 -0300
Subject: In 'lua_checkmemory', userdata can be gray, too

Since commit ca6fe7449a74, userdata with uservalues can be gray
and can belong to gray lists ('gclist').
---
 ltests.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ltests.c b/ltests.c
index 314505c3..63ad4498 100644
--- a/ltests.c
+++ b/ltests.c
@@ -519,6 +519,10 @@ static void checkgraylist (global_State *g, GCObject *o) {
       case LUA_VCCL: o = gco2ccl(o)->gclist; break;
       case LUA_VTHREAD: o = gco2th(o)->gclist; break;
       case LUA_VPROTO: o = gco2p(o)->gclist; break;
+      case LUA_VUSERDATA:
+        lua_assert(gco2u(o)->nuvalue > 0);
+        o = gco2u(o)->gclist;
+        break;
       default: lua_assert(0);  /* other objects cannot be in a gray list */
     }
   }
-- 
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