[issue30579] Allow traceback objects to be instantiated/mutated/annotated

[Nathaniel Smith]

Nathaniel Smith <njs at pobox.com> added the comment:

PR 4793 provides everything that Jinja2 and Trio actually need right now. It doesn't provide any way to annotate tracebacks with extra data, but I'm not entirely sure if that's necessary or what it would look like, so I figured I'd at least get this part in for 3.7.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30579>
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