Some SyntaxErrors not highlighted

``` .py
(bpython)tom-mba:bpython tomb$ bpython
bpython version 0.13-363 on top of Python 2.7.5 /Users/tomb/.virtualenvs/bpython/bin/python2.7
>>> from __future__ import whoops
SyntaxError: future feature whoops is not defined (<input>, line 1)
>>>
```

This syntax error isn't highlighted for me - I would guess it fails the pygments parsing.
