/home/travis/build/apache/arrow/pyarrow-test-3.6/lib/python3.6/site-packages/sphinx/util/docutils.py:311: RemovedInSphinx30Warning: function based directive support is now deprecated. Use class based directive instead.
File "/home/travis/build/apache/arrow/pyarrow-test-3.6/lib/python3.6/site-packages/breathe/renderer/sphinxrenderer.py", line 38, in parse_definition
ast = parser.parse_declaration("class")
TypeError: parse_declaration() missing 1 required positional argument: 'directiveType'
The full traceback has been saved in /tmp/sphinx-err-i64grj3x.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!