Function NSShouldRetainWithZone 

pub unsafe extern "C-unwind" fn NSShouldRetainWithZone(
    an_object: &AnyObject,
    requested_zone: *mut NSZone,
) -> bool

Available on crate features NSObject and NSZone only.

Safety

• an_object should be of the correct type.
• requested_zone must be a valid pointer or null.