diff -r 3172da69ff37 -r 07d08c130892 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Thu Dec 16 14:50:27 2010 -0600
+++ b/mercurial/subrepo.py	Thu Dec 16 14:50:36 2010 -0600
@@ -21,7 +21,7 @@
             for l in ctx['.hgsubstate'].data().splitlines():
                 revision, path = l.split(" ", 1)
                 rev[path] = revision
-        except IOError as err:
+        except IOError, err:
             if err.errno != errno.ENOENT:
                 raise
     return rev