1 files changed, 15 insertions, 0 deletions

diff --git a/testes/gc.lua b/testes/gc.lua
index 96eadad8..0693837c 100644
--- a/testes/gc.lua
+++ b/testes/gc.lua
@@ -601,6 +601,21 @@ end
 
 
 if T then
+  collectgarbage("stop")
+  T.gcstate("pause")
+  local sup = {x = 0}
+  local a = setmetatable({}, {__newindex = sup})
+  T.gcstate("enteratomic")
+  assert(T.gccolor(sup) == "black")
+  a.x = {}   -- should not break the invariant
+  assert(not (T.gccolor(sup) == "black" and T.gccolor(sup.x) == "white"))
+  T.gcstate("pause")  -- complete the GC cycle
+  sup.x.y = 10
+  collectgarbage("restart")
+end
+
+
+if T then
   print("emergency collections")
   collectgarbage()
   collectgarbage()