[issue19235] Add a dedicated subclass for recursion errors

[Elazar Gershuni]

Elazar Gershuni added the comment:

Looks good to me.

Is it possible to add it to 2.7? I think it won't break any PEP8-following code (e.g. not testing for type equality/identity)

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<http://bugs.python.org/issue19235>
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