Fix build warning
Summary: Doesn't need to be `mut` anymore. Probably because we upgraded to tokio 1.0.
@@ -63,7 +63,7 @@ mod tests {
use super::*;
fn handle_and_counting_receiver() -> (ControlledHandle, mpsc::Receiver<u64>) {
- let (mut tx, rx) = mpsc::channel(1);
+ let (tx, rx) = mpsc::channel(1);
let handle = spawn_controlled(async move {
let mut x: u64 = 0;
loop {
