From afb0d2e145a86964dfe23c19c4005874a0e16652 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Fri, 26 Aug 2016 15:39:21 +0200
Subject: [PATCH] partial fix for #4623

---
 compiler/semtypes.nim | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/semtypes.nim b/compiler/semtypes.nim
index 9d00c06caf..3834d0b51b 100644
--- a/compiler/semtypes.nim
+++ b/compiler/semtypes.nim
@@ -110,6 +110,8 @@ proc semContainer(c: PContext, n: PNode, kind: TTypeKind, kindStr: string,
   result = newOrPrevType(kind, prev, c)
   if sonsLen(n) == 2:
     var base = semTypeNode(c, n.sons[1], nil)
+    if base.kind == tyVoid:
+      localError(n.info, errTIsNotAConcreteType, typeToString(base))
     addSonSkipIntLit(result, base)
   else:
     localError(n.info, errXExpectsOneTypeParam, kindStr)