[issue2772] Add PendingDeprecationWarning for % formatting

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

Since we're just trying to prevent this function from recursing
(indirectly) into itself, I think all of the logic can go here.

What would you suggest the function _PyErr_InErrorProcessing do differently?

I think the real issue is:  Does the additional logic and execution time
involved in adding per-thread state justify being "more correct", or can
we occasionally lose a warning message?

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