Using pypy3 I see this reliably (tox -e pypy3 -- -m 'not slow'):
collecting ... Exception ignored in: <_io.FileIO fd=3 mode='rb' closefd=True>
ResourceWarning: unclosed file <_io.FileIO fd=3 mode='rb' closefd=True>
collected 2422 items / 1675 deselected / 747 selected
Python 3.6.1 (784b254d669919c872a505b807db8462b6140973, May 09 2019, 13:17:30)
[PyPy 7.1.1-beta0 with GCC 8.3.0]
Not on master, and only with usedevelop = true.
Using pypy3 I see this reliably (
tox -e pypy3 -- -m 'not slow'):Not on master, and only with
usedevelop = true.