error: implement default error traits

src/error.rs

@@ -1,3 +1,5 @@
+use std::fmt;
+use std::error;
 use std::ffi;
 use nix;
 
@@ -39,3 +41,28 @@ impl From<udev::Error> for Error {
 		Error::Udev(value)
 	}
 }
+
+impl fmt::Display for Error {
+	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+		f.write_str(error::Error::description(self))
+	}
+}
+
+impl error::Error for Error {
+	fn description(&self) -> &str {
+		match self {
+			&Error::Nix(ref err) =>
+				err.description(),
+
+			&Error::Nul(ref err) =>
+				err.description(),
+
+			#[cfg(feature = "udev")]
+			&Error::Udev(ref err) =>
+				err.description(),
+
+			&Error::NotFound =>
+				"Device not found.",
+		}
+	}
+}