Receive::recv() can't be used while dropping a value in thread local

[carllerche]

Related to #24313, Receive::recv() accesses thread::current() which cannot be called when a thread local is being dropped

[apasel422]

Is this referring to std::sync::mpsc::Receiver::recv?

[Mark-Simulacrum]

I attempted to reproduce with Receiver::recv, but was unable to, so I'm going to close. If this is still a problem, please provide a code example we can utilize for testing.

use std::thread;
use std::sync::mpsc;

struct Handle {
    x: mpsc::Receiver<i32>,
    s: mpsc::Sender<i32>,
}

impl Drop for Handle {
    fn drop(&mut self) {
        println!("{:?}", self.x.recv().unwrap());
        println!("{:?}", self.x.recv().unwrap());
    }
}

thread_local!(static HANDLE: Handle = new_handle());

fn new_handle() -> Handle {
    let (s, r) = mpsc::channel();
    s.send(10).unwrap();
    Handle { x: r, s: s, }
}

pub fn main() {
    let _s = thread::spawn(|| {
        HANDLE.with(|h| {
            h.s.send(15).unwrap();
        });
    });

    _s.join().unwrap();
}