new error messages

x.go:11: illegal types for operand: AS
	*I
	*T
	(*interface vs *struct)

R=r
DELTA=10  (8 added, 0 deleted, 2 changed)
OCL=21457
CL=21602
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index ed2df26..bd1e346 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -351,10 +351,10 @@
 	TFUNC,
 	TARRAY,
 	T_old_DARRAY,
-	TSTRUCT,
+	TSTRUCT,		// 23
 	TCHAN,
 	TMAP,
-	TINTER,
+	TINTER,			// 26
 	TFORW,
 	TFIELD,
 	TANY,