You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/gogll/examples/empty/rust/empty/src/parser
    
    the code of the file until where you have to start completion: //! Module parser is generated by GoGLL. Do not edit.

extern crate lazy_static;

pub mod bsr;
mod slot;
mod symbols;

use crate::lexer;
use crate::token;
use slot::{Label};
use symbols::{NT,Symbol};

use lazy_static::lazy_static;
use std::collections::{HashMap, HashSet};
use std::fmt;
use std::rc::Rc;

struct Parser {
	c_
    
    fn call(&mut self, l: Label, i: usize, j: usize) {
        let u = CRFNode::new(l, i);
        if let None = self.crf_nodes.get(&u) {
            self.crf_nodes.insert(u);
        }
        let x = match l.symbols()[l.pos()-1]{
            Symbol::NT(x) => x,
            _ => panic!("Symbol::T is invalid"),
        };
        let nd_v = ClusterNode::new(x, j);
        match self.crf.get_mut(&nd_v) {
            None => {
                let mut m: HashSet<CRFNode> = HashSet::with_capacity(128);
                m.insert(u);
                self.crf.insert(nd_v, m);
                self.nt_add(x, j);
            },
            Some(v) => {
                if !v.contains(&u) {
                    v.insert(u);
                    let mut descs: Vec<Rc<Descriptor>> = Vec::new();
                    for pnd in self.popped.iter() {
                        if pnd.x == x && pnd.k == j {
                            descs.push(Descriptor::new(l, i, pnd.j));
                            self.bsr_set.add(l, i, j, pnd.j);
                        }
                    }
                    for d in descs.into_iter() {
                        self.dsc_add(d.l, d.k, d.i)
                    }
                }
            }
        }
    }