From ffb812521da02f19c05452b9498615159d53557d Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Sat, 24 Sep 2016 02:52:16 +0200
Subject: [PATCH] fixes serious regression

---
 lib/system/avltree.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/system/avltree.nim b/lib/system/avltree.nim
index 892ee571d..50faada26 100644
--- a/lib/system/avltree.nim
+++ b/lib/system/avltree.nim
@@ -52,7 +52,7 @@ proc split(t: var PAvlNode) =
     inc t.level
 
 proc add(a: var MemRegion, t: var PAvlNode, key, upperBound: int) {.benign.} =
-  if t == bottom:
+  if t.isBottom:
     t = allocAvlNode(a, key, upperBound)
   else:
     if key <% t.key: