Derive debug on public structs (#62)

* Derive Debug on all public structs

* Enable a warning about missing debug implementations on public struct

src/lib.rs

@@ -94,6 +94,7 @@
 #![doc(html_root_url = "https://docs.rs/tokio-core/0.1")]
 #![deny(missing_docs)]
 #![deny(warnings)]
+#![warn(missing_debug_implementations)]
 
 extern crate bytes;
 #[macro_use]

src/net/tcp.rs

@@ -24,6 +24,7 @@ pub struct TcpListener {
 /// Stream returned by the `TcpListener::incoming` function representing the
 /// stream of sockets received from a listener.
 #[must_use = "streams do nothing unless polled"]
+#[derive(Debug)]
 pub struct Incoming {
     inner: TcpListener,
 }
@@ -226,11 +227,13 @@ pub struct TcpStream {
 /// Future returned by `TcpStream::connect` which will resolve to a `TcpStream`
 /// when the stream is connected.
 #[must_use = "futures do nothing unless polled"]
+#[derive(Debug)]
 pub struct TcpStreamNew {
     inner: TcpStreamNewState,
 }
 
 #[must_use = "futures do nothing unless polled"]
+#[derive(Debug)]
 enum TcpStreamNewState {
     Waiting(TcpStream),
     Error(io::Error),

src/net/udp/frame.rs

@@ -56,6 +56,7 @@ pub trait UdpCodec {
 /// You can acquire a `UdpFramed` instance by using the `UdpSocket::framed`
 /// adapter.
 #[must_use = "sinks do nothing unless polled"]
+#[derive(Debug)]
 pub struct UdpFramed<C> {
     socket: UdpSocket,
     codec: C,

src/net/udp/mod.rs

@@ -405,6 +405,7 @@ impl fmt::Debug for UdpSocket {
 ///
 /// This is created by the `UdpSocket::send_dgram` method.
 #[must_use = "futures do nothing unless polled"]
+#[derive(Debug)]
 pub struct SendDgram<T>(Option<(UdpSocket, T, SocketAddr)>);
 
 fn incomplete_write(reason: &str) -> io::Error {
@@ -437,6 +438,7 @@ impl<T> Future for SendDgram<T>
 ///
 /// This is created by the `UdpSocket::recv_dgram` method.
 #[must_use = "futures do nothing unless polled"]
+#[derive(Debug)]
 pub struct RecvDgram<T>(Option<(UdpSocket, T)>);
 
 impl<T> Future for RecvDgram<T>