:ref: with invalid reference does not generate a warning
If I misspell a :ref:`xxx`, I do not get a warning when doing make html that xxx does not exist. I tried this both in my project and in the python doc tree (so I don't think it's my configuration). make clean doesn't seem to make any difference to the results. This is with 1.0.5 in my project, and 1.0.1 for the python docs case.