[issue1265] pdb bug with "with" statement

[Guido van Rossum]

Guido van Rossum added the comment:

BTW: if you can show (e.g. with your unittest) that this indeed breaks
in 2.6 and 2.5, please do backport it.

BTW**2: I've noticed that abc.py's __instancecheck__ gets called a lot
at times when I don't expect it.  Can you research this a bit?

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