[issue12537] mailbox's _become_message is very fragile

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 5c1c402a63e5 by R David Murray in branch 'default':
#12537: in mailbox avoid depending on knowledge of email package internals
http://hg.python.org/cpython/rev/5c1c402a63e5

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12537>
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