Using grep, I identified 3 instances in main where code checks if Py_EnterRecursiveCall(...) < 0 (which just returns _Py_EnterRecursiveCall(...)) or _Py_EnterRecursiveCall(...) < 0.

1. Py_EnterRecursiveCall() documentation only guarantees that a nonzero value is returned in the event of an error.
2. The actual implementation can't return a negative value:

Linked PRs

• gh-101965: Fix usage of Py_EnterRecursiveCall return value in _bisectmodule.c #101966