[New-bugs-announce] [issue29973] Travis CI docs broken: UnboundLocalError: local variable 'prefix' referenced before assignment

[STINNER Victor]

New submission from STINNER Victor:

https://travis-ci.org/python/cpython/jobs/218107336

CPython: master branch
Sphinx 1.5.4

make[1]: Entering directory `/home/travis/build/python/cpython/Doc'
./venv/bin/python -m sphinx -b suspicious -d build/doctrees -D latex_elements.papersize= -q -W . build/suspicious 

Exception occurred:
  File "/home/travis/virtualenv/python3.6.0/lib/python3.6/site-packages/sphinx/domains/python.py", line 317, in before_content
    if prefix:
UnboundLocalError: local variable 'prefix' referenced before assignment

----------
assignee: docs at python
components: Documentation, Tests
messages: 291075
nosy: docs at python, haypo
priority: normal
severity: normal
status: open
title: Travis CI docs broken: UnboundLocalError: local variable 'prefix' referenced before assignment
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29973>
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