diff -ur v6/inc_ut.py v7/inc_ut.py
--- v6/inc_ut.py	2020-09-24 21:32:53.000000000 +0900
+++ v7/inc_ut.py	2020-09-26 02:54:32.000000000 +0900
@@ -11,20 +11,34 @@
 	dic = {}
 	ks = []
 
+	e = empty.new()
+	e.last = ''
+
+	def anon_k():
+		id = 0
+		get = lambda : 'tMp_{}'.format( id )
+		while get() in dic:
+			id += 1
+		return get()
+
 	def set(s):
-		get_k = lambda : s[ 2 : ]
+		def get_k():
+			k = s[ 2 : ]
+			return k if k else anon_k()
 
 		if s.startswith( '@>' ):
 			ks.append( get_k() )
 			return True
 		if s.startswith( '@<' ):
 			if ks:
-				ks.pop()
+				e.last = ks.pop()
 			return True
 		if s.startswith( '@!' ):
 			k = get_k()
 			if k in dic:
 				dic.pop( k )
+			if k == e.last:
+				e.last = ''
 			return True
 		if ks:
 			k = ks[ -1 ]
@@ -37,7 +51,9 @@
 
 	get = dic.get
 
-	return empty.new( locals() )
+	to_last_key = lambda s, k='$$': s.replace( k, e.last )
+
+	return empty.add( e, locals() )
 
 def read_str(path):
 	r = False
@@ -96,6 +112,9 @@
 		if path == None:
 			return None
 
+		path = buf.to_last_key( path )
+		opts = list( map( buf.to_last_key, opts ) )
+
 		r = buf.get( path )
 		if r != None:
 			paths.append( path )