message: Fix compilation in Rust 1.51
diff: @@ -96,7 +96,7 @@ mod tests {
  fn parse_invalid_port_id_min() {
  // invalid min port id
  let id = validate_port_identifier("p");
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  @@ -105,14 +105,14 @@ mod tests {
  let id = validate_port_identifier(
  "9anxkcme6je544d5lnj46zqiiiygfqzf8w4bjecbnyj4lj6s7zlpst67yln64tixp",
  );
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_connection_id_min() {
  // invalid min connection id
  let id = validate_connection_identifier("connect01");
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  @@ -121,14 +121,14 @@ mod tests {
  let id = validate_connection_identifier(
  "ihhankr30iy4nna65hjl2wjod7182io1t2s7u3ip3wqtbbn1sl0rgcntqc540r36r",
  );
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_client_id_min() {
  // invalid min client id
  let id = validate_client_identifier("client");
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  @@ -137,14 +137,14 @@ mod tests {
  let id = validate_client_identifier(
  "f0isrs5enif9e4td3r2jcbxoevhz6u1fthn4aforq7ams52jn5m48eiesfht9ckpn",
  );
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_channel_id_min() {
  // invalid min channel id
  let id = validate_channel_identifier("channel");
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  @@ -153,27 +153,27 @@ mod tests {
  let id = validate_channel_identifier(
  "hlkbzrbmrh0rjrh8f8a8d9lmtjuhww7a9ev3blskc58amhwfq07zwp1xevxz1p098",
  );
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_id_chars() {
  // invalid id chars
  let id = validate_identifier("channel@01", 1, 10);
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_id_empty() {
  // invalid id empty
  let id = validate_identifier("", 1, 10);
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  #[test]
  fn parse_invalid_id_path_separator() {
  // invalid id with path separator
  let id = validate_identifier("id/1", 1, 10);
  - assert!(id.is_err(), true)
  + assert!(id.is_err())
  }
  }
  