[issue25448] Exception ABC doesn't work in Python 3 (but does in Python 2.7)

[Josh Rosenberg]

Josh Rosenberg added the comment:

This looks like a duplicate of #12029. The delays on addressing that bug seem to indicate that initially there was a fairly substantial performance cost for all exception handling paths when ABC friendly checking was performed, but that was at least partially due to a bug in those code paths that didn't bypass the ABC machinery in the simple subclass case.

That said, I'm not sure it wouldn't cause other performance regressions (I made a comment to that effect on the original bug).

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nosy: +josh.r

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