test of new empty productions

R=gri
DELTA=8  (8 added, 0 deleted, 0 changed)
OCL=16765
CL=16767

test/empty.go

+// $G $D/$F.go
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package P
+
+import ( )
+const ( )
+var ( )
+type ( )