[issue14133] improved PEP 409 implementation

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

The other problem with the "separate attribute" approach is that it makes the condition for suppressing the context ugly:

  exc.__suppress_context__ or exc.__cause__ is not None

That's hardly cleaner than:

  exc.__cause__ is not Ellipsis

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14133>
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