From: Robert Griesemer <gri@golang.org>
Date: Tue, 15 Jul 2014 02:14:27 +0000 (-0700)
Subject: go/ast: fix walk to handle "for range x"
X-Git-Tag: go1.4beta1~1099
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=deae10e0384c3224662946bc33e3a5badff782c6;p=gostls13.git

go/ast: fix walk to handle "for range x"

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/117790043
---

diff --git a/src/pkg/go/ast/walk.go b/src/pkg/go/ast/walk.go
index fedffb3f22..73ac38647a 100644
--- a/src/pkg/go/ast/walk.go
+++ b/src/pkg/go/ast/walk.go
@@ -275,7 +275,9 @@ func Walk(v Visitor, node Node) {
 		Walk(v, n.Body)
 
 	case *RangeStmt:
-		Walk(v, n.Key)
+		if n.Key != nil {
+			Walk(v, n.Key)
+		}
 		if n.Value != nil {
 			Walk(v, n.Value)
 		}