Fix unused code warnings test.

lightning/src/util/fairrwlock.rs

@@ -1,4 +1,4 @@
-use std::sync::{TryLockResult, LockResult, RwLock, RwLockReadGuard, RwLockWriteGuard};
+use std::sync::{LockResult, RwLock, RwLockReadGuard, RwLockWriteGuard};
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 /// Rust libstd's RwLock does not provide any fairness guarantees (and, in fact, when used on
@@ -32,10 +32,6 @@ impl<T> FairRwLock<T> {
 		res
 	}
 
-	pub fn try_write(&self) -> TryLockResult<RwLockWriteGuard<T>> {
-		self.lock.try_write()
-	}
-
 	pub fn read(&self) -> LockResult<RwLockReadGuard<T>> {
 		if self.waiting_writers.load(Ordering::Relaxed) != 0 {
 			let _write_queue_lock = self.lock.write();

lightning/src/util/mod.rs

@@ -25,7 +25,7 @@ pub mod persist;
 pub(crate) mod atomic_counter;
 pub(crate) mod byte_utils;
 pub(crate) mod chacha20;
-#[cfg(feature = "std")]
+#[cfg(all(not(test), feature = "std"))]
 pub(crate) mod fairrwlock;
 #[cfg(fuzzing)]
 pub mod zbase32;

lightning/src/util/test_utils.rs

@@ -267,12 +267,12 @@ impl TestChannelMessageHandler {
 		expected_msgs.as_mut().unwrap().push(ev);
 	}
 
-	fn received_msg(&self, ev: wire::Message<()>) {
+	fn received_msg(&self, _ev: wire::Message<()>) {
 		let mut msgs = self.expected_recv_msgs.lock().unwrap();
 		if msgs.is_none() { return; }
 		assert!(!msgs.as_ref().unwrap().is_empty(), "Received message when we weren't expecting one");
 		#[cfg(test)]
-		assert_eq!(msgs.as_ref().unwrap()[0], ev);
+		assert_eq!(msgs.as_ref().unwrap()[0], _ev);
 		msgs.as_mut().unwrap().remove(0);
 	}
 }