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: bindings.rs
    path of file: ./repos/lucet/lucet-module/src
    
    the code of the file until where you have to start completion: use crate::Error;
use serde_json::{self, Map, Value};
use std::collections::{hash_map::Entry, HashMap};
use std::fs;
use std::path::Path;

#[derive(Debug, Clone, PartialEq)]
pub struct Bindings {
    bindings: HashMap<String, HashMap<String, String>>,
}

impl Bindings {
    pub fn new(bindings: HashMap<String, HashMap<String, String>>) -> Bindings {
        Self { bindings }
    }

    pub fn env(env: HashMap<String, String>) -> Bindings {
        let mut bindings = HashMap::new();
        bindings.insert("env".to_owned(), env);
        Self::new(bindings)
    }

    pub fn empty() -> Bindings {
        Self::new(HashMap::new())
    }

    pub fn from_json(v: &Value) -> Result<Bindings, Error> {
        match v.as_object() {
            Some(modules) => Self::parse_modules_json_obj(modules),
            None => Err(Error::ParseJsonObjError),
        }
    }

    pub fn from_str(s: &str) -> Result<Bindings, Error> {
      
    
    pub fn extend(&mut self, other: &Bindings) -> Result<(), Error> {
        for (modname, othermodbindings) in other.bindings.iter() {
            match self.bindings.entry(modname.clone()) {
                Entry::Occupied(mut e) => {
                    let existing = e.get_mut();
                    for (bindname, binding) in othermodbindings {
                        match existing.entry(bindname.clone()) {
                            Entry::Vacant(e) => {
                                e.insert(binding.clone());
                            }
                            Entry::Occupied(e) => {
                                if binding != e.get() {
                                    return Err(Error::RebindError {
                                        key: e.key().to_owned(),
                                        binding: binding.to_owned(),
                                        attempt: e.get().to_owned(),
                                    });
                                }
                            }
                        }
                    }
                }
                Entry::Vacant(e) => {
                    e.insert(othermodbindings.clone());
                }
            }
        }
        Ok(())
    }