From 0e23ac3680c69515c9587c73a9d2e725d3a27259 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Sun, 5 Jul 2015 14:03:12 +0200
Subject: [PATCH] fixes #3053

---
 compiler/transf.nim | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/compiler/transf.nim b/compiler/transf.nim
index 57547b682..39842056f 100644
--- a/compiler/transf.nim
+++ b/compiler/transf.nim
@@ -468,7 +468,11 @@ proc transformFor(c: PTransf, n: PNode): PTransNode =
   c.breakSyms.add(labl)
   result = newTransNode(nkBlockStmt, n.info, 2)
   result[0] = newSymNode(labl).PTransNode
-
+  if call.typ.isNil:
+    # see bug #3051
+    result[1] = newNode(nkEmpty).PTransNode
+    discard c.breakSyms.pop
+    return result
   if call.typ.kind != tyIter and
     (call.kind notin nkCallKinds or call.sons[0].kind != nkSym or
       call.sons[0].sym.kind != skIterator):