Tracebacks from Cython modules no longer work

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BPO	32797
Nosy	@brettcannon, @pfmoore, @ncoghlan, @scoder, @encukou, @embray, @ericsnowcurrently, @sth, @jdemeyer
PRs	python/cpython#6653 python/cpython#9540

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-02-08.11:55:24.486>
labels = ['3.8', 'type-bug', 'library']
title = 'Tracebacks from Cython modules no longer work'
updated_at = <Date 2018-10-24.12:44:51.835>
user = 'https://github.com/jdemeyer'

bugs.python.org fields:

activity = <Date 2018-10-24.12:44:51.835>
actor = 'petr.viktorin'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-02-08.11:55:24.486>
creator = 'jdemeyer'
dependencies = []
files = []
hgrepos = []
issue_num = 32797
keywords = ['patch']
message_count = 52.0
messages = ['311829', '311892', '311896', '311897', '315703', '315801', '315957', '315960', '315965', '315989', '315990', '316000', '316001', '316002', '316005', '316006', '316022', '323106', '323107', '323115', '323116', '323117', '323119', '323122', '323124', '323128', '323129', '323139', '323142', '323143', '323146', '323150', '323151', '323155', '323161', '323162', '323165', '323167', '323168', '323170', '323171', '323172', '323173', '323175', '323192', '323193', '323196', '323197', '323198', '323200', '327389', '328365']
nosy_count = 9.0
nosy_names = ['brett.cannon', 'paul.moore', 'ncoghlan', 'scoder', 'petr.viktorin', 'erik.bray', 'eric.snow', 'sth', 'jdemeyer']
pr_nums = ['6653', '9540']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32797'
versions = ['Python 3.8']

The issue names no source files or tests. Start by reviewing PRs #6653 and #9540 and the linked BPO issue 32797 to reconstruct the traceback regression; done means restoring working tracebacks from Cython modules and validating the reported behavior.

Written by the indexing model from the issue text.

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