gh-93442: Add test for _Py_CAST(nullptr). (gh-93505) (gh-93509)

(cherry picked from commit 713eb184b50f2b8b138fb01187ee32fa29a815c9)

Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>

Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
1 file changed