Derive some std::fmt::Debug impls. (#1226)

* Derive some `Debug` impls.

* And some more.

Also remove several #[inline] attributes.

misc/multistream-select/src/length_delimited.rs

@@ -34,6 +34,7 @@ const DEFAULT_BUFFER_SIZE: usize = 64;
 /// We purposely only support a frame sizes up to 16KiB (2 bytes unsigned varint
 /// frame length). Frames mostly consist in a short protocol name, which is highly
 /// unlikely to be more than 16KiB long.
+#[derive(Debug)]
 pub struct LengthDelimited<R> {
     /// The inner I/O resource.
     inner: R,
@@ -269,6 +270,7 @@ where
 
 /// A `LengthDelimitedReader` implements a `Stream` of uvi-length-delimited
 /// frames on an underlying I/O resource combined with direct `AsyncWrite` access.
+#[derive(Debug)]
 pub struct LengthDelimitedReader<R> {
     inner: LengthDelimited<R>
 }

misc/multistream-select/src/negotiated.rs

@@ -36,11 +36,13 @@ use std::{mem, io, fmt, error::Error};
 ///
 /// Reading from a `Negotiated` I/O stream that still has pending negotiation
 /// protocol data to send implicitly triggers flushing of all yet unsent data.
+#[derive(Debug)]
 pub struct Negotiated<TInner> {
     state: State<TInner>
 }
 
 /// A `Future` that waits on the completion of protocol negotiation.
+#[derive(Debug)]
 pub struct NegotiatedComplete<TInner> {
     inner: Option<Negotiated<TInner>>
 }
@@ -146,6 +148,7 @@ impl<TInner> Negotiated<TInner> {
 }
 
 /// The states of a `Negotiated` I/O stream.
+#[derive(Debug)]
 enum State<R> {
     /// In this state, a `Negotiated` is still expecting to
     /// receive confirmation of the protocol it as settled on.

misc/multistream-select/src/protocol.rs

@@ -297,6 +297,7 @@ where
 
 /// A `MessageReader` implements a `Stream` of `Message`s on an underlying
 /// I/O resource combined with direct `AsyncWrite` access.
+#[derive(Debug)]
 pub struct MessageReader<R> {
     inner: LengthDelimitedReader<R>
 }