ipython / ipython/ipython

Freeze by `unittest.mock.call??`

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Description

I can consistently make my Ubuntu 14.04 host freeze with this recipe:

On Python 3.6.1 installed via `pyenv` (https://github.com/pyenv/pyenv), and IPython 6.0.0 installed via `pip` run:

>>> from unittest.mock import call
>>> call??

Observe the entire host stop responding, as if all the CPU and/or memory are consumed by IPython.

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