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

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

go/ast: fix walk to handle "for range x"
LGTM=rsc R=rsc CC=golang-codereviews https://golang.org/cl/117790043
deae10e0 · Robert Griesemer · 79b106ec · deae10e0
Commit deae10e0 authored Jul 15, 2014 by Robert Griesemer
Hide whitespace changes
Inline Side-by-side

Showing with 3 additions and 1 deletion

walk.go src/pkg/go/ast/walk.go +3 -1

No files found.
--- 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)
 		}