diff -r d60678a567a9 -r 328739ea70c3 mercurial/repair.py
--- a/mercurial/repair.py	Tue Jun 23 22:38:21 2015 -0700
+++ b/mercurial/repair.py	Tue Jun 23 22:20:08 2015 -0700
@@ -205,7 +205,7 @@
         for undovfs, undofile in repo.undofiles():
             try:
                 undovfs.unlink(undofile)
-            except OSError, e:
+            except OSError as e:
                 if e.errno != errno.ENOENT:
                     ui.warn(_('error removing %s: %s\n') %
                             (undovfs.join(undofile), str(e)))