Fix Clippy warnings on Windows

Seems this isn't check on the CI.

src/sys/windows/afd.rs

@@ -180,12 +180,12 @@ cfg_io_source! {
                     &AFD_HELPER_ATTRIBUTES as *const _ as *mut _,
                     &mut iosb,
                     null_mut(),
-                    0 as ULONG,
+                    0,
                     FILE_SHARE_READ | FILE_SHARE_WRITE,
                     FILE_OPEN,
-                    0 as ULONG,
+                    0,
                     null_mut(),
-                    0 as ULONG,
+                    0,
                 );
                 if status != STATUS_SUCCESS {
                     let raw_err = io::Error::from_raw_os_error(
@@ -214,18 +214,18 @@ cfg_io_source! {
     }
 }
 
-pub const POLL_RECEIVE: u32 = 0b000_000_001;
-pub const POLL_RECEIVE_EXPEDITED: u32 = 0b000_000_010;
-pub const POLL_SEND: u32 = 0b000_000_100;
-pub const POLL_DISCONNECT: u32 = 0b000_001_000;
-pub const POLL_ABORT: u32 = 0b000_010_000;
-pub const POLL_LOCAL_CLOSE: u32 = 0b000_100_000;
+pub const POLL_RECEIVE: u32 = 0b0_0000_0001;
+pub const POLL_RECEIVE_EXPEDITED: u32 = 0b0_0000_0010;
+pub const POLL_SEND: u32 = 0b0_0000_0100;
+pub const POLL_DISCONNECT: u32 = 0b0_0000_1000;
+pub const POLL_ABORT: u32 = 0b0_0001_0000;
+pub const POLL_LOCAL_CLOSE: u32 = 0b0_0010_0000;
 // Not used as it indicated in each event where a connection is connected, not
 // just the first time a connection is established.
 // Also see https://github.com/piscisaureus/wepoll/commit/8b7b340610f88af3d83f40fb728e7b850b090ece.
-pub const POLL_CONNECT: u32 = 0b001_000_000;
-pub const POLL_ACCEPT: u32 = 0b010_000_000;
-pub const POLL_CONNECT_FAIL: u32 = 0b100_000_000;
+pub const POLL_CONNECT: u32 = 0b0_0100_0000;
+pub const POLL_ACCEPT: u32 = 0b0_1000_0000;
+pub const POLL_CONNECT_FAIL: u32 = 0b1_0000_0000;
 
 pub const KNOWN_EVENTS: u32 = POLL_RECEIVE
     | POLL_RECEIVE_EXPEDITED

src/sys/windows/named_pipe.rs

@@ -467,12 +467,8 @@ impl Drop for NamedPipe {
             }
 
             let io = self.inner.io.lock().unwrap();
-
-            match io.read {
-                State::Pending(..) => {
-                    drop(cancel(&self.inner.handle, &self.inner.read));
-                }
-                _ => {}
+            if let State::Pending(..) = io.read {
+                drop(cancel(&self.inner.handle, &self.inner.read));
             }
         }
     }
@@ -587,7 +583,8 @@ impl Inner {
 
     fn post_register(me: &Arc<Inner>, mut events: Option<&mut Vec<Event>>) {
         let mut io = me.io.lock().unwrap();
-        if Inner::schedule_read(&me, &mut io, events.as_mut().map(|ptr| &mut **ptr)) {
+        #[allow(clippy::needless_option_as_deref)]
+        if Inner::schedule_read(me, &mut io, events.as_deref_mut()) {
             if let State::None = io.write {
                 io.notify_writable(events);
             }

src/sys/windows/selector.rs

@@ -44,7 +44,7 @@ impl AfdGroup {
 
     pub fn release_unused_afd(&self) {
         let mut afd_group = self.afd_group.lock().unwrap();
-        afd_group.retain(|g| Arc::strong_count(&g) > 1);
+        afd_group.retain(|g| Arc::strong_count(g) > 1);
     }
 }
 
@@ -58,7 +58,7 @@ cfg_io_source! {
                 self._alloc_afd_group(&mut afd_group)?;
             } else {
                 // + 1 reference in Vec
-                if Arc::strong_count(afd_group.last().unwrap()) >= POLL_GROUP__MAX_GROUP_SIZE + 1 {
+                if Arc::strong_count(afd_group.last().unwrap()) > POLL_GROUP__MAX_GROUP_SIZE  {
                     self._alloc_afd_group(&mut afd_group)?;
                 }
             }
@@ -447,11 +447,11 @@ impl SelectorInner {
                 if len == 0 {
                     continue;
                 }
-                return Ok(());
+                break Ok(());
             }
         } else {
             self.select2(&mut events.statuses, &mut events.events, timeout)?;
-            return Ok(());
+            Ok(())
         }
     }
 
@@ -461,7 +461,7 @@ impl SelectorInner {
         events: &mut Vec<Event>,
         timeout: Option<Duration>,
     ) -> io::Result<usize> {
-        assert_eq!(self.is_polling.swap(true, Ordering::AcqRel), false);
+        assert!(self.is_polling.swap(true, Ordering::AcqRel));
 
         unsafe { self.update_sockets_events() }?;
 
@@ -481,7 +481,7 @@ impl SelectorInner {
         for sock in update_queue.iter_mut() {
             let mut sock_internal = sock.lock().unwrap();
             if !sock_internal.is_pending_deletion() {
-                sock_internal.update(&sock)?;
+                sock_internal.update(sock)?;
             }
         }
 
@@ -517,12 +517,9 @@ impl SelectorInner {
 
             let sock_state = from_overlapped(iocp_event.overlapped());
             let mut sock_guard = sock_state.lock().unwrap();
-            match sock_guard.feed_event() {
-                Some(e) => {
-                    events.push(e);
-                    n += 1;
-                }
-                None => {}
+            if let Some(e) = sock_guard.feed_event() {
+                events.push(e);
+                n += 1;
             }
 
             if !sock_guard.is_pending_deletion() {

tests/util/mod.rs

@@ -269,18 +269,20 @@ pub fn set_linger_zero(socket: &TcpStream) {
         l_linger: 0,
     };
 
-    match unsafe {
+    let res = unsafe {
         setsockopt(
             socket.as_raw_socket() as _,
             SOL_SOCKET,
             SO_LINGER,
             &val as *const _ as *const _,
             size_of::<linger>() as _,
         )
-    } {
-        SOCKET_ERROR => panic!("error setting linger: {}", io::Error::last_os_error()),
-        _ => {}
-    }
+    };
+    assert!(
+        res != SOCKET_ERROR,
+        "error setting linger: {}",
+        io::Error::last_os_error()
+    );
 }
 
 /// Returns a path to a temporary file using `name` as filename.

tests/win_named_pipe.rs

@@ -121,8 +121,7 @@ fn connect_before_client() {
 
     let mut events = Events::with_capacity(128);
     t!(poll.poll(&mut events, Some(Duration::new(0, 0))));
-    let e = events.iter().collect::<Vec<_>>();
-    assert_eq!(e.len(), 0);
+    assert_eq!(events.iter().count(), 0);
     assert_eq!(
         server.connect().err().unwrap().kind(),
         io::ErrorKind::WouldBlock
@@ -157,8 +156,7 @@ fn connect_after_client() {
 
     let mut events = Events::with_capacity(128);
     t!(poll.poll(&mut events, Some(Duration::new(0, 0))));
-    let e = events.iter().collect::<Vec<_>>();
-    assert_eq!(e.len(), 0);
+    assert_eq!(events.iter().count(), 0);
 
     let mut client = client(&name);
     t!(poll.registry().register(