range clause must have = or :=
:= illegal in for-increment

R=r
OCL=21204
CL=21204
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index 858afc1..a85d6f7 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -197,6 +197,7 @@
 	uchar	method;		// OCALLMETH name
 	uchar	iota;		// OLITERAL made from iota
 	uchar	embedded;	// ODCLFIELD embedded type
+	uchar	colas;		// OAS resulting from :=
 
 	// most nodes
 	Node*	left;