[issue9815] assertRaises as a context manager keeps tracebacks and frames alive

[Michael Foord]

Michael Foord added the comment:

The patch py3k_fix__AssertRaisesContext.patch looks good. A test would be nice. The code already attempts to sanitize the traceback, so sanitizing __cause__ and __context__ seems reasonable.

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versions: +Python 3.3, Python 3.4

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