Ignore clippy lints on copied code
// When we upgrade to tower 0.4, we can use tokio's PollSemaphore, like tower's:
// ccfaffc buffer, limit: use `tokio-util`'s `PollSemaphore` (#556)
+// Ignore lints on this copied code
+#![allow(dead_code)]
+
pub(crate) use self::sync::OwnedSemaphorePermit as Permit;
use futures_core::ready;
use std::{
