From d84ace8a5b7d1a875b5beaf1330e1d80931f3ef9 Mon Sep 17 00:00:00 2001
From: Yuriy Glukhov <yglukhov@users.noreply.github.com>
Date: Tue, 30 Jan 2018 17:25:41 +0300
Subject: [PATCH] Fixes #7140 (#7154)

---
 compiler/sempass2.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/sempass2.nim b/compiler/sempass2.nim
index d427750e40..e560c18c85 100644
--- a/compiler/sempass2.nim
+++ b/compiler/sempass2.nim
@@ -747,7 +747,7 @@ proc track(tracked: PEffects, n: PNode) =
       # may not look like an assignment, but it is:
       let arg = n.sons[1]
       initVarViaNew(tracked, arg)
-      if {tfNeedsInit} * arg.typ.lastSon.flags != {}:
+      if arg.typ.len != 0 and {tfNeedsInit} * arg.typ.lastSon.flags != {}:
         if a.sym.magic == mNewSeq and n[2].kind in {nkCharLit..nkUInt64Lit} and
             n[2].intVal == 0:
           # var s: seq[notnil];  newSeq(s, 0)  is a special case!