message: refactor(error): remove PartialEq derives for error kind enums
  Replaced the comparisons with `matches!`. This should reduce a bit of
  code generation that isn't really needed.
diff: @@ -17,11 +17,12 @@ struct ErrorImpl {
  cause: Option<Cause>,
  }
  -#[derive(Debug, PartialEq)]
  +#[derive(Debug)]
  pub(super) enum Kind {
  Parse(Parse),
  User(User),
  /// A message reached EOF, but is not complete.
  + #[allow(unused)]
  IncompleteMessage,
  /// A connection received a message (or bytes) when not waiting for one.
  #[cfg(feature = "http1")]
  @@ -34,6 +35,7 @@ pub(super) enum Kind {
  #[cfg(any(feature = "http1", feature = "http2"))]
  Io,
  /// Error occurred while connecting.
  + #[allow(unused)]
  Connect,
  /// Error creating a TcpListener.
  #[cfg(all(
  @@ -63,7 +65,7 @@ pub(super) enum Kind {
  Http2,
  }
  -#[derive(Debug, PartialEq)]
  +#[derive(Debug)]
  pub(super) enum Parse {
  Method,
  Version,
  @@ -77,7 +79,7 @@ pub(super) enum Parse {
  Internal,
  }
  -#[derive(Debug, PartialEq)]
  +#[derive(Debug)]
  pub(super) enum User {
  /// Error calling user's HttpBody::poll_data().
  #[cfg(any(feature = "http1", feature = "http2"))]
  @@ -152,27 +154,27 @@ impl Error {
  /// Returns true if this was about a `Request` that was canceled.
  pub fn is_canceled(&self) -> bool {
  - self.inner.kind == Kind::Canceled
  + matches!(self.inner.kind, Kind::Canceled)
  }
  /// Returns true if a sender's channel is closed.
  pub fn is_closed(&self) -> bool {
  - self.inner.kind == Kind::ChannelClosed
  + matches!(self.inner.kind, Kind::ChannelClosed)
  }
  /// Returns true if this was an error from `Connect`.
  pub fn is_connect(&self) -> bool {
  - self.inner.kind == Kind::Connect
  + matches!(self.inner.kind, Kind::Connect)
  }
  /// Returns true if the connection closed before a message could complete.
  pub fn is_incomplete_message(&self) -> bool {
  - self.inner.kind == Kind::IncompleteMessage
  + matches!(self.inner.kind, Kind::IncompleteMessage)
  }
  /// Returns true if the body write was aborted.
  pub fn is_body_write_aborted(&self) -> bool {
  - self.inner.kind == Kind::BodyWriteAborted
  + matches!(self.inner.kind, Kind::BodyWriteAborted)
  }
  /// Returns true if the error was caused by a timeout.
  