[issue19235] Add a dedicated subclass for recursion errors

[Georg Brandl]

Georg Brandl added the comment:

Attached is a patch, please review.  Introduces a RecursionError that subclasses RuntimeError for compatibility.

Note: I also tested this with RecursionError not subclassing RuntimeError, to make sure that except clauses in the test suite are sufficiently narrowed to RecursionError.

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keywords: +patch
Added file: http://bugs.python.org/file32091/recursion_error.patch

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