use std::cell::Cell;
use std::boxed::Box;

fn main()
{
    let mut node = Node::new();

    println!("{:?}", Node::FRAG);
}

#[derive(Debug)]
struct Node{
    node: Option<Box<Node>>
}


impl Node{
    const mut FRAG: bool =  false;

    fn new() -> Self{
        Self{
            node: Some(Box::new(Self{node: None}))
        }
    }

    fn set_FRAG(b: bool) -> bool{
        Self::FRAG = b;
        b
    }

}