Derive PartialEq for Errors

src/error.rs

@@ -8,9 +8,8 @@ use libusb::*;
 /// A result of a function that may return a `Error`.
 pub type Result<T> = StdResult<T, Error>;
 
-
 /// Errors returned by the `libusb` library.
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub enum Error {
     /// Success (no error).
     Success,