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gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106)
When a custom iterator calls next() on the same csv.reader from
within __next__, the inner iteration sets self->fields to NULL.
The outer iteration then crashes in parse_save_field() by passing
NULL to PyList_Append.
Add a guard after PyIter_Next() to detect that fields was set to
NULL by a re-entrant call, and raise csv.Error instead of crashing.
(cherry picked from commit 20994b1809)
Co-authored-by: Ramin Farajpour Cami <ramin.blackhat@gmail.com>
Source files for standard library extension modules, and former extension modules that are now builtin modules.