bpo-27494: Fix a 2to3 parser bug (trailing comma) by jstasiak · Pull Request #60 · python/cpython

This commit adds a test case to trigger an assertion failure during shutdown and
fixes the bug. The assertion was added by my first attempt to fix issue python#60.
Thanks to Masamitsu Murase for reporting the bug and for providing the fix.
(grafted from 655f2a2292a237636849b4a82fb0a2dde1ee9847 and 109d5d067b14)

…ession

While this is a valid Python 2 and Python 3 syntax lib2to3 would choke
on it:

    set(x for x in [],)

This patch changes the grammar definition used by lib2to3 so that the
actual Python syntax is supported now and backwards compatibility is
preserved.

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* Update .coveragerc

* Keep whitespace consistent.

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

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* Fix: Correct target_bb_id in jump array

* Doc: Updated doc for add_metadata_to_jump_2d_array

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