From ae901b327246f66c4082d09fedbc35ee6a42421b Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Tue, 2 Oct 2018 15:51:33 +0200
Subject: fixes #7351

---
 compiler/sigmatch.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'compiler')

diff --git a/compiler/sigmatch.nim b/compiler/sigmatch.nim
index 407e34619..e0fa74db5 100644
--- a/compiler/sigmatch.nim
+++ b/compiler/sigmatch.nim
@@ -1376,6 +1376,7 @@ proc typeRelImpl(c: var TCandidate, f, aOrig: PType,
 
   of tyGenericInst:
     var prev = PType(idTableGet(c.bindings, f))
+    let origF = f
     var f = if prev == nil: f else: prev
 
     let roota = a.skipGenericAlias
@@ -1433,7 +1434,8 @@ proc typeRelImpl(c: var TCandidate, f, aOrig: PType,
 
         result = isNone
     else:
-      result = typeRel(c, lastSon(f), a)
+      assert lastSon(origF) != nil
+      result = typeRel(c, lastSon(origF), a)
       if result != isNone and a.kind != tyNil:
         put(c, f, a)
 
-- 
cgit 1.4.1-2-gfad0