=========================

Bug Fixes
---------

- `4174 <https://github.com/pytest-dev/pytest/issues/4174>`_: Fix "ValueError: Plugin already registered" with conftest plugins via symlink.


- `4181 <https://github.com/pytest-dev/pytest/issues/4181>`_: Handle race condition between creation and deletion of temporary folders.


- `4221 <https://github.com/pytest-dev/pytest/issues/4221>`_: Fix bug where the warning summary at the end of the test session was not showing the test where the warning was originated.


- `4243 <https://github.com/pytest-dev/pytest/issues/4243>`_: Fix regression when ``stacklevel`` for warnings was passed as positional argument on python2.



Improved Documentation
----------------------

- `3851 <https://github.com/pytest-dev/pytest/issues/3851>`_: Add reference to ``empty_parameter_set_mark`` ini option in documentation of ``pytest.mark.parametrize``



Trivial/Internal Changes
------------------------

- `4028 <https://github.com/pytest-dev/pytest/issues/4028>`_: Revert patching of ``sys.breakpointhook`` since it appears to do nothing.


- `4233 <https://github.com/pytest-dev/pytest/issues/4233>`_: Apply an import sorter (``reorder-python-imports``) to the codebase.


- `4248 <https://github.com/pytest-dev/pytest/issues/4248>`_: Remove use of unnecessary compat shim, six.binary_type

=========================

Bug Fixes
---------

- `2909 <https://github.com/pytest-dev/pytest/issues/2909>`_: Improve error message when a recursive dependency between fixtures is detected.


- `3340 <https://github.com/pytest-dev/pytest/issues/3340>`_: Fix logging messages not shown in hooks ``pytest_sessionstart()`` and ``pytest_sessionfinish()``.


- `3533 <https://github.com/pytest-dev/pytest/issues/3533>`_: Fix unescaped XML raw objects in JUnit report for skipped tests


- `3691 <https://github.com/pytest-dev/pytest/issues/3691>`_: Python 2: safely format warning message about passing unicode strings to ``warnings.warn``, which may cause
surprising ``MemoryError`` exception when monkey patching ``warnings.warn`` itself.


- `4026 <https://github.com/pytest-dev/pytest/issues/4026>`_: Improve error message when it is not possible to determine a function's signature.


- `4177 <https://github.com/pytest-dev/pytest/issues/4177>`_: Pin ``setuptools>=40.0`` to support ``py_modules`` in ``setup.cfg``


- `4179 <https://github.com/pytest-dev/pytest/issues/4179>`_: Restore the tmpdir behaviour of symlinking the current test run.


- `4192 <https://github.com/pytest-dev/pytest/issues/4192>`_: Fix filename reported by ``warnings.warn`` when using ``recwarn`` under python2.