Bug, docs issue, or my being stupid? (Translations behave differently when imported as _)

gistfile1.py

In [1]: from django.utils.translation import ugettext as _

In [2]: [_('red'),_('blue')]
Out[2]: [u'red', u'blue']

In [3]: [_('red'),_('blue')]
TypeError                                 Traceback (most recent call last)
/Users/jg026715/.virtualenvs/iqh/lib/python2.7/site-packages/django/core/management/commands/shell.pyc in <module>()
----> 1 [_('red'),_('blue')]

TypeError: 'list' object is not callable

In [4]: [_('red'),_('blue')]
KeyboardInterrupt

In [4]: from django.utils.translation import ugettext

In [5]: [ugettext('red'),ugettext('blue')]
Out[5]: [u'red', u'blue']

In [6]: [ugettext('red'),ugettext('blue')]
Out[6]: [u'red', u'blue']

In [10]: from django.utils.translation import ugettext as foo

In [11]: [foo('red'), foo('blue')]
Out[11]: [u'red', u'blue']

In [12]: [foo('red'), foo('blue')]
Out[12]: [u'red', u'blue']