From 5c46f268802217b774df23d4dcf07a6f7b0ebc20 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Wed, 30 Nov 2016 02:08:34 +0100
Subject: [PATCH] fix upcoming/asyncdispatch properly

---
 lib/upcoming/asyncdispatch.nim | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/upcoming/asyncdispatch.nim b/lib/upcoming/asyncdispatch.nim
index 6e14a9fe75..0b5ff89bab 100644
--- a/lib/upcoming/asyncdispatch.nim
+++ b/lib/upcoming/asyncdispatch.nim
@@ -1070,9 +1070,7 @@ when defined(windows) or defined(nimdoc):
       if cb(fd):
         # we need this check to avoid exception, if `unregister(event)` was
         # called in callback.
-        if ev.hWaiter != 0:
-          GC_ref(pcd.ovl)
-          pcd.ovl.data.cell = system.protect(rawEnv(pcd.ovl.data.cb))
+        if ev.hWaiter != 0: unregister(ev)
         deallocShared(cast[pointer](pcd))
       else:
         GC_ref(pcd.ovl)