diff -r 506a07ea1173 Lib/trace.py
--- a/Lib/trace.py	Fri Oct 25 22:33:52 2013 -0500
+++ b/Lib/trace.py	Sat Oct 26 12:44:50 2013 +0800
@@ -198,7 +198,7 @@
     comparepath = os.path.normcase(path)
     longest = ""
     for dir in sys.path:
-        dir = os.path.normcase(dir)
+        dir = os.path.normcase(dir.rstrip('/'))
         if comparepath.startswith(dir) and comparepath[len(dir)] == os.sep:
             if len(dir) > len(longest):
                 longest = dir