From 88c4d6aabed415150068b440ce8860644aa56152 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Wed, 5 Apr 2017 11:32:23 +0200
Subject: [PATCH] fix another compiler regression

---
 compiler/sempass2.nim | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler/sempass2.nim b/compiler/sempass2.nim
index 2133d9beff..88c05faa4e 100644
--- a/compiler/sempass2.nim
+++ b/compiler/sempass2.nim
@@ -833,6 +833,10 @@ proc track(tracked: PEffects, n: PNode) =
   of nkTypeSection, nkProcDef, nkConverterDef, nkMethodDef, nkIteratorDef,
       nkMacroDef, nkTemplateDef, nkLambda, nkDo:
     discard
+  of nkCast, nkHiddenStdConv, nkHiddenSubConv, nkConv:
+    if n.len == 2: track(tracked, n.sons[1])
+  of nkObjUpConv, nkObjDownConv, nkChckRange, nkChckRangeF, nkChckRange64:
+    if n.len == 1: track(tracked, n.sons[0])
   else:
     for i in 0 .. <safeLen(n): track(tracked, n.sons[i])