[issue6210] Exception Chaining missing method for suppressing context

[Ethan Furman]

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

> And what if the exception is raised from a subroutine?

Well, if I have it surrounded by a try/except block, presumably I'm aware that an exception could be raised.  ;)

And if I'm aware that an exception could be raised, it may also be possible that I want to change the exception -- leading to the three possibilities I described earlier.  

Looking through my dbf module, most of those re-raises I'll be changing to use the raise ... from ... syntax, but there are still a couple places where it makes no sense to have the extra nested information available.

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