docs(server): set doc_cfg attributes for tcp feature gated Server methods (#2401)

src/server/server.rs

@@ -52,37 +52,43 @@ impl<I> Server<I, ()> {
     }
 }
 
-#[cfg(feature = "tcp")]
-impl Server<AddrIncoming, ()> {
-    /// Binds to the provided address, and returns a [`Builder`](Builder).
-    ///
-    /// # Panics
-    ///
-    /// This method will panic if binding to the address fails. For a method
-    /// to bind to an address and return a `Result`, see `Server::try_bind`.
-    pub fn bind(addr: &SocketAddr) -> Builder<AddrIncoming> {
-        let incoming = AddrIncoming::new(addr).unwrap_or_else(|e| {
-            panic!("error binding to {}: {}", addr, e);
-        });
-        Server::builder(incoming)
-    }
+cfg_feature! {
+    #![all(feature = "tcp")]
 
-    /// Tries to bind to the provided address, and returns a [`Builder`](Builder).
-    pub fn try_bind(addr: &SocketAddr) -> crate::Result<Builder<AddrIncoming>> {
-        AddrIncoming::new(addr).map(Server::builder)
-    }
+    impl Server<AddrIncoming, ()> {
+        /// Binds to the provided address, and returns a [`Builder`](Builder).
+        ///
+        /// # Panics
+        ///
+        /// This method will panic if binding to the address fails. For a method
+        /// to bind to an address and return a `Result`, see `Server::try_bind`.
+        pub fn bind(addr: &SocketAddr) -> Builder<AddrIncoming> {
+            let incoming = AddrIncoming::new(addr).unwrap_or_else(|e| {
+                panic!("error binding to {}: {}", addr, e);
+            });
+            Server::builder(incoming)
+        }
 
-    /// Create a new instance from a `std::net::TcpListener` instance.
-    pub fn from_tcp(listener: StdTcpListener) -> Result<Builder<AddrIncoming>, crate::Error> {
-        AddrIncoming::from_std(listener).map(Server::builder)
+        /// Tries to bind to the provided address, and returns a [`Builder`](Builder).
+        pub fn try_bind(addr: &SocketAddr) -> crate::Result<Builder<AddrIncoming>> {
+            AddrIncoming::new(addr).map(Server::builder)
+        }
+
+        /// Create a new instance from a `std::net::TcpListener` instance.
+        pub fn from_tcp(listener: StdTcpListener) -> Result<Builder<AddrIncoming>, crate::Error> {
+            AddrIncoming::from_std(listener).map(Server::builder)
+        }
     }
 }
 
-#[cfg(feature = "tcp")]
-impl<S, E> Server<AddrIncoming, S, E> {
-    /// Returns the local address that this server is bound to.
-    pub fn local_addr(&self) -> SocketAddr {
-        self.spawn_all.local_addr()
+cfg_feature! {
+    #![all(feature = "tcp")]
+
+    impl<S, E> Server<AddrIncoming, S, E> {
+        /// Returns the local address that this server is bound to.
+        pub fn local_addr(&self) -> SocketAddr {
+            self.spawn_all.local_addr()
+        }
     }
 }