[issue6210] Exception Chaining missing method for suppressing context

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Not sure I have traceback._iter_chain() patched correctly, but all the tests pass.

Here's the latest code.

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Added file: http://bugs.python.org/file24362/raise_from_none_v3.diff

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