a few more modules get __all__
diff --git a/Lib/linecache.py b/Lib/linecache.py
index c39f8db..d6fc28c 100644
--- a/Lib/linecache.py
+++ b/Lib/linecache.py
@@ -9,6 +9,8 @@
 import os
 from stat import *
 
+__all__ = ["getline","clearcache","checkcache"]
+
 def getline(filename, lineno):
     lines = getlines(filename)
     if 1 <= lineno <= len(lines):