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AttributeError: 'Function' object has no attribute 'get_marker'

See original GitHub issue

I just started getting the following error with pytest-cov v2.6.0, pytest v4.1.0 on Python 3.4.6, PyPy, and PyPy3

self = <pytest_cov.plugin.CovPlugin object at 0x110f365c0>, item = <Function test_x>

    @compat.hookwrapper
    def pytest_runtest_call(self, item):
>       if (item.get_marker('no_cover')
                or 'no_cover' in getattr(item, 'fixturenames', ())):
E               AttributeError: 'Function' object has no attribute 'get_marker'

../.pyenv/versions/3.4.9/envs/venv/lib/python3.4/site-packages/pytest_cov/plugin.py:289: AttributeError

How to replicate

Create a virtualenv with Python 3.4.9
pip install pytest==4.1.0 pytest-cov==2.6.0
Create something.py with the following contents:

def test_x():
    assert True

Run pytest --cov=something something.py

Pytest output

========================================================== test session starts ===========================================================
platform darwin -- Python 3.4.9, pytest-4.1.0, py-1.7.0, pluggy-0.8.0 -- /Users/ross/.pyenv/versions/3.4.9/envs/venv/bin/python
cachedir: .pytest_cache
rootdir: /Users/ross/temp, inifile:
plugins: cov-2.6.0
collected 1 item

something.py::test_x FAILED                                                                                                        [100%]

================================================================ FAILURES ================================================================
_________________________________________________________________ test_x _________________________________________________________________

self = <pytest_cov.plugin.CovPlugin object at 0x110f365c0>, item = <Function test_x>

    @compat.hookwrapper
    def pytest_runtest_call(self, item):
>       if (item.get_marker('no_cover')
                or 'no_cover' in getattr(item, 'fixturenames', ())):
E               AttributeError: 'Function' object has no attribute 'get_marker'

../.pyenv/versions/3.4.9/envs/venv/lib/python3.4/site-packages/pytest_cov/plugin.py:289: AttributeError

---------- coverage: platform darwin, python 3.4.9-final-0 -----------
Name           Stmts   Miss  Cover
----------------------------------
something.py       2      1    50%

======================================================== 1 failed in 0.07 seconds ========================================================