Method parent

src/tree/binary/node.rs:85–87

(node: Option<NonNull<Self>>)

    }

    pub fn parent(node: Option<NonNull<Self>>) -> Option<NonNull<Self>> {
        unsafe { node.and_then(|node| node.as_ref().parent) }
    }

    pub fn sibling(node: Option<NonNull<Self>>) -> Option<NonNull<Self>> {
        unsafe {