diff -r ea61e278ae92 -r af73c05e735a mercurial/extensions.py
--- a/mercurial/extensions.py	Fri Jan 23 17:47:04 2015 -0600
+++ b/mercurial/extensions.py	Fri Jan 23 20:30:49 2015 -0800
@@ -107,8 +107,6 @@
             else:
                 ui.warn(_("*** failed to import extension %s: %s\n")
                         % (name, inst))
-            if ui.traceback():
-                return 1
 
     for name in _order[newindex:]:
         uisetup = getattr(_extensions[name], 'uisetup', None)