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/Kooha/src/screencast_portal
    
    the code of the file until where you have to start completion: mod handle_token;
mod types;
mod variant_dict;
mod window_identifier;

use anyhow::{anyhow, bail, Context, Result};
use futures_channel::oneshot;
use futures_util::future::{self, Either};
use gtk::{
    gio,
    glib::{
        self,
        variant::{Handle, ObjectPath},
    },
    prelude::*,
};

use std::{cell::RefCell, os::unix::io::RawFd, time::Duration};

use self::{handle_token::HandleToken, variant_dict::VariantDict};
pub use self::{
    types::{Cur
    
    pub async fn open_pipe_wire_remote(&self) -> Result<RawFd> {
        let (response, fd_list) = self
            .proxy
            .call_with_unix_fd_list_future(
                "OpenPipeWireRemote",
                Some(&(&self.session_handle, VariantDict::default()).to_variant()),
                gio::DBusCallFlags::NONE,
                PROXY_CALL_TIMEOUT.as_millis() as i32,
                gio::UnixFDList::NONE,
            )
            .await?;

        tracing::trace!(%response, fd_list = ?fd_list.peek_fds(), "Opened pipe wire remote");

        let (fd_index,) = variant_get::<(Handle,)>(&response)?;

        debug_assert_eq!(fd_list.length(), 1);

        let fd = fd_list
            .get(fd_index.0)
            .with_context(|| format!("Failed to get fd at index `{}`", fd_index.0))?;

        Ok(fd)
    }