add an asynchronous exception class

[Paul Rubin]

"Christian Stapfer" <nil at dev.nul> writes:
> I guess it means the following:
> 
> "Terminating exceptions" are exceptions that
> terminate the *thrower* of the exception.

Are you sure?  I didn't read it that way.  I'm not aware of there ever
having been a detailed proposal for resumable exceptions in Python,
though the gurus would know better than I do whether there's been one.