Failure of deprecation warning mechanism of sphinx.util.compat.Directive with IPython extension

[jfbu]

Subject: the sphinx.util.compat module is deprecated at 1.6 and will be removed at 1.7. But when I use ipython directive with Sphinx 1.6.2, there is no warning.

Procedure to reproduce the problem

With Sphinx 1.6.2:

mkdir /tmp/IPython-test
cd /tmp/IPython-test
yes "n" | sphinx-quickstart --dot _ --project IPython-test --author "Example" -v 0 --release 0 --language en --suffix .rst --master index --makefile --batchfile .
echo "
extensions = [
    'IPython.sphinxext.ipython_console_highlighting',
    'IPython.sphinxext.ipython_directive',
]

ipython_mplbackend = None
" >> conf.py
echo "
Welcome to IPython-test's documentation!
========================================

.. ipython::

   In [1]: x = 1

   In [2]: y = x**2

   In [3]: print(y)

" > index.rst
make html

there is no warning.

On the other hand when using Sphinx master branch, build fails

Extension error:
Could not import extension IPython.sphinxext.ipython_directive (exception: No module named 'sphinx.util.compat')
make: *** [Makefile:20: html] Error 1

Expected results

1.6.x Sphinx users of ipython directive get a warning and can report upstream... but I did it already at ipython/ipython#10666 ;-)

Environment info

• OS: Mac
• Python version: 3.5.3
• IPython version: 6.1.0
• Sphinx version: 1.6.2

[tk0miya]

Fixed at 6a37912.