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: chan.rs
    path of file: ./repos/tokio/tokio/src/sync/mpsc
    
    the code of the file until where you have to start completion: use crate::loom::cell::UnsafeCell;
use crate::loom::future::AtomicWaker;
use crate::loom::sync::atomic::AtomicUsize;
use crate::loom::sync::Arc;
use crate::runtime::park::CachedParkThread;
use crate::sync::mpsc::error::TryRecvError;
use crate::sync::mpsc::{bounded, list, unbounded};
use crate::sync::notify::Notify
    
    fn drop(&mut self) {
        use super::block::Read::Value;

        // Safety: the only owner of the rx fields is Chan, and being
        // inside its own Drop means we're the last ones to touch it.
        self.rx_fields.with_mut(|rx_fields_ptr| {
            let rx_fields = unsafe { &mut *rx_fields_ptr };

            while let Some(Value(_)) = rx_fields.list.pop(&self.tx) {}
            unsafe { rx_fields.list.free_blocks() };
        });
    }