fix clippy

rust/fastpay_core/src/base_types.rs

@@ -276,7 +276,7 @@ impl From<SequenceNumber> for usize {
 }
 
 pub trait Digestible {
-    fn digest(self: &Self) -> [u8; 32];
+    fn digest(&self) -> [u8; 32];
 }
 
 impl Digestible for [u8; 5] {

rust/fastpay_core/src/messages.rs

@@ -263,7 +263,7 @@ impl<'a> SignatureAggregator<'a> {
             !self.used_authorities.contains(&authority),
             FastPayError::CertificateAuthorityReuse
         );
-        self.used_authorities.insert(authority.clone());
+        self.used_authorities.insert(authority);
         // Update weight.
         let voting_rights = self.committee.weight(&authority);
         fp_ensure!(voting_rights > 0, FastPayError::UnknownSigner);
@@ -296,7 +296,7 @@ impl CertifiedTransferOrder {
                 !used_authorities.contains(authority),
                 FastPayError::CertificateAuthorityReuse
             );
-            used_authorities.insert(authority.clone());
+            used_authorities.insert(*authority);
             // Update weight.
             let voting_rights = committee.weight(authority);
             fp_ensure!(voting_rights > 0, FastPayError::UnknownSigner);

rust/fastpay_core/src/unit_tests/client_tests.rs

@@ -31,7 +31,7 @@ impl AuthorityClient for LocalAuthorityClient {
                 .lock()
                 .await
                 .handle_confirmation_order(order)
-                .and_then(|(info, _)| Ok(info))
+                .map(|(info, _)| info)
         })
     }