a bug in startup_modules plugin?

[dimpase]

On #18997 (http://patchbot.sagemath.org/ticket/18997/) I saw PluginFailed - on startup_modules, which appears to be caused by innocent things like

   from itertools import combinations

The patchbots seem to think that "sage.combinat.designs.itertools" is a valid module name, see e.g.
http://patchbot.sagemath.org/ticket/18997/plugin/plugins.startup_modules/2015-08-26%2006:41:06%20+0000/

[videlec]

See also http://patchbot.sagemath.org/ticket/18411/

[fchapoton]

This is triggered by a call to

print '\n'.join(sorted(sys.modules.keys()))

which gives many wrong module names, such as sage.misc.builtin or sage.misc.future

[fchapoton]

This is solved in patchbot 2.5.7, which has a better handling of the startup module.