[Python-modules-team] Bug#849216: Packages which FTBFS with AssertionError about len(context)

[Santiago Vila]

Package: checkbox-ng,dhcpcanon,ipywidgets,nbsphinx,pylibmc
Severity: serious

Dear maintainer:

The following packages currently FTBFS in testing:

checkbox-ng
dhcpcanon
ipywidgets
nbsphinx
pylibmc

with an AssertionError like this:

--------------------------------------------------------------------
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [ 12%] behaviors

Exception occurred:
  File "/usr/lib/python2.7/dist-packages/docutils/writers/_html_base.py", line 671, in depart_document
    assert not self.context, 'len(context) = %s' % len(self.context)
AssertionError: len(context) = 1
--------------------------------------------------------------------

There are build logs available in the reproducible builds site.
For example:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/checkbox-ng.html

Is this a bug in those packages or is there a build-dependency
which broke all of them?

Please advise about what to do. If those are all different bugs
I will have to file separate bugs, but before that I want to be sure.

OTOH, if they are the same bug and there is only one package to fix,
please tell me so that I can reassign and use "affects".

Thanks.