From d60448fa693c0e1c483232f8fdef39fd2a927e20 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Fri, 21 Oct 2016 03:09:00 +0200
Subject: [PATCH] fixes #4869

---
 compiler/types.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/types.nim b/compiler/types.nim
index 3db0c45077..4e60e0121f 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -1374,7 +1374,7 @@ proc safeInheritanceDiff*(a, b: PType): int =
   if a.kind == tyError or b.kind == tyError:
     result = -1
   else:
-    result = inheritanceDiff(a, b)
+    result = inheritanceDiff(a.skipTypes(skipPtrs), b.skipTypes(skipPtrs))
 
 proc compatibleEffectsAux(se, re: PNode): bool =
   if re.isNil: return false