[issue10775] assertRaises as a context manager should accept a 'msg' keyword argument.

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

New patch by Ezio looks good to me. Go ahead and commit. Please raise a separate issue for error reporting when invalid argument combinations are used. (i.e. additional keyword arguments but no callable.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10775>
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