use error-chain in ethcore-network

util/io/src/lib.rs

@@ -67,9 +67,9 @@ extern crate parking_lot;
 mod service;
 mod worker;
 
-use mio::{Token};
+use std::{fmt, error};
 use mio::deprecated::{EventLoop, NotifyError};
-use std::fmt;
+use mio::Token;
 
 pub use worker::LOCAL_STACK_SIZE;
 
@@ -93,6 +93,12 @@ impl fmt::Display for IoError {
 	}
 }
 
+impl error::Error for IoError {
+	fn description(&self) -> &str {
+		"IO error"
+	}
+}
+
 impl From<::std::io::Error> for IoError {
 	fn from(err: ::std::io::Error) -> IoError {
 		IoError::StdIo(err)