Move UnknownAlgorithmError to lib.rs.

src/hash/mod.rs

@@ -1,13 +1,8 @@
 //! Cryptographic hashes.
 
 use std::io::Write;
-use derive_more::{Constructor, Display, Error};
 
-#[derive(Clone, Constructor, Debug, Display, Error)]
-#[display(fmt = "{}: unknown algorithm", name)]
-pub struct UnknownAlgorithmError {
-    name: String
-}
+use crate::UnknownAlgorithmError;
 
 /// A cryptographic hash algorithm.
 pub trait Hash: Write {

src/lib.rs

@@ -1,6 +1,14 @@
 //! Scytale (pronounced /ˈskɪtəliː/) is a **fast** and **correct**
 //! cryptographic library.
 
+use derive_more::{Constructor, Display, Error};
+
+#[derive(Clone, Constructor, Debug, Display, Error)]
+#[display(fmt = "{}: unknown algorithm", name)]
+pub struct UnknownAlgorithmError {
+    name: String
+}
+
 pub mod hash;
 pub mod mac;
 pub(crate) mod util;

src/mac/mod.rs

@@ -9,7 +9,7 @@
 use std::io::Write;
 use crate::hash::sha2::{Sha224, Sha256, Sha384, Sha512, Sha512_224, Sha512_256};
 use crate::mac::hmac::Hmac;
-use crate::hash::UnknownAlgorithmError;
+use crate::UnknownAlgorithmError;
 
 /// A Message Authentication Code algorithm.
 pub trait Mac: Write {