--- a/mercurial/pathutil.py	Tue Jun 23 22:38:21 2015 -0700
+++ b/mercurial/pathutil.py	Tue Jun 23 22:20:08 2015 -0700
@@ -76,7 +76,7 @@
             curpath = os.path.join(self.root, prefix)
             try:
                 st = os.lstat(curpath)
-            except OSError, err:
+            except OSError as err:
                 # EINVAL can be raised as invalid path syntax under win32.
                 # They must be ignored for patterns can be checked too.
                 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL):