From 98e76a1058df52c281a80921828f73396ac69d73 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Wed, 2 Oct 2019 17:01:27 +0200
Subject: [PATCH] fixes #12336 [backport]

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

diff --git a/compiler/semtypinst.nim b/compiler/semtypinst.nim
index 1b2f802299..f9908f90f6 100644
--- a/compiler/semtypinst.nim
+++ b/compiler/semtypinst.nim
@@ -589,7 +589,7 @@ proc replaceTypeVarsTAux(cl: var TReplTypeVars, t: PType): PType =
       for i in 0 ..< len(result):
         if result.sons[i] != nil:
           if result.sons[i].kind == tyGenericBody:
-            localError(cl.c.config, t.sym.info,
+            localError(cl.c.config, if t.sym != nil: t.sym.info else: cl.info,
               "cannot instantiate '" &
               typeToString(result.sons[i], preferDesc) &
               "' inside of type definition: '" &