* Lib/linecache.py: don't crash on empty filename
	* Lib/macpath.py: don't return trailing colon for dirname()
	(XXX won't do for volume names -- but otherwise glob(':*:*.py')
	loops forever)
	* Lib/traceback.py: print SyntaxError correctly
	* Lib/stat.py: moved to posixstat.py; added macstat.py which has
	the constants for the Mac; and created new stat.py which includes
	the right one
	* Lib/urllib.py: fix caching bug (by disabling the cache)
diff --git a/Lib/macpath.py b/Lib/macpath.py
index b5c17f0..0e32ab2 100644
--- a/Lib/macpath.py
+++ b/Lib/macpath.py
@@ -43,7 +43,7 @@
 	colon = 0
 	for i in range(len(s)):
 		if s[i] == ':': colon = i+1
-	return s[:colon], s[colon:]
+	return s[:colon-1], s[colon:]
 
 
 # Short interfaces to split()