[issue7942] Inconsistent error types/messages for __len__ between old and new-style classes

[Paul Boddie]

Paul Boddie <paul at boddie.org.uk> added the comment:

I would have expected a more accurate error message for the new-style class. In the original message which brought this to my attention, the cause was not particularly obvious:

http://www.selenic.com/pipermail/mercurial/2010-February/030066.html

I concede that the different mechanisms in place for new-style classes might make it hard to have a specific error message in such a situation, though.

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