--- es_b.py-	2016-09-30 04:00:00.000000000 +0900
+++ es_b.py	2016-10-01 00:00:00.000000000 +0900
@@ -833,7 +833,7 @@ def load_src(fn):
 if __name__ == "__main__":
 	rcode = 0
 	if len(sys.argv) <= 1:
-		print('usage: {} [-v -vv -vvv] file'.format(sys.argv[0]))
+		print('usage: {} [-v -vv -vvv -vvvv] file'.format(sys.argv[0]))
 	else:
 		verb = 0
 		argv = sys.argv[:]
@@ -843,9 +843,15 @@ if __name__ == "__main__":
 				verb = i + 1
 		s = load_src( argv[1] )
 		lst = es_split(s, verb)
-		if verb >= 3:
+
+		is_main = next( ( True for e in lst if e[:2] == [ 'fdef', 'main' ] ), False )
+
+		if verb >= 3 or not is_main:
 			show_yaml(lst, 'lst')
 
+		if not is_main:
+			sys.exit(rcode)
+
 		info = do_global(lst, verb)
 
 		argv = argv[1:]