pub fn null_mut<T, O>() -> BitPtr<Mut, T, O>where T: BitStore, O: BitOrder,
tarpaulin_include
BitPtr does not permit actual null pointers. Instead, it uses the canonical dangling address as a sentinel for uninitialized, useless, locations.
BitPtr
You should use Option<BitPtr> if you need to track nullability.
Option<BitPtr>
ptr::null_mut