f38841a8e2
Closes #2915 When using the C API directly, the intended way to call `visitproc` is via the `Py_VISIT` macro, which checks to see that the provided pointer is not null before passing it along to `visitproc`. Because PyO3 isn't using the macro, it needs to manually check that the pointer isn't null. Without this check, calling `visit.call(&obj)` where `let obj = None;` will segfault.
83 B
83 B
Traversal visit calls to Option<T: AsPyPointer> no longer segfaults when None.