chore: apply rust 1.92 new clippy lints

Author: Alenar

demo/protocol-demo/src/demonstrator.rs

@@ -128,8 +128,8 @@ impl Party {
         println!(
             "Party #{}: {}",
             self.party_id,
-            if signature.is_some() {
-                format!("lottery #{:?} won", signature.as_ref().unwrap().indexes)
+            if let Some(sig) = &signature {
+                format!("lottery #{:?} won", sig.indexes)
             } else {
                 "lost all lotteries".to_string()
             }

mithril-common/src/test/builder/certificate_chain_builder.rs

@@ -565,21 +565,17 @@ impl<'a> CertificateChainBuilder<'a> {
                     .map(|c| c.epoch != certificate.epoch)
                     .unwrap_or(true);
 
-                certificates_chained
-                    .iter()
-                    .rev()
-                    .filter(|c| {
-                        if is_certificate_first_of_epoch {
-                            // The previous certificate of the first certificate of an epoch
-                            // is the first certificate of the previous epoch
-                            c.epoch == certificate.epoch.previous().unwrap()
-                        } else {
-                            // The previous certificate of not the first certificate of an epoch
-                            // is the first certificate of the epoch
-                            c.epoch == certificate.epoch
-                        }
-                    })
-                    .next_back()
+                certificates_chained.iter().rev().rfind(|c| {
+                    if is_certificate_first_of_epoch {
+                        // The previous certificate of the first certificate of an epoch
+                        // is the first certificate of the previous epoch
+                        c.epoch == certificate.epoch.previous().unwrap()
+                    } else {
+                        // The previous certificate of not the first certificate of an epoch
+                        // is the first certificate of the epoch
+                        c.epoch == certificate.epoch
+                    }
+                })
             }
             CertificateChainingMethod::Sequential => certificates_chained.last(),
         }

mithril-test-lab/mithril-end-to-end/src/utils/spec_utils.rs

@@ -30,11 +30,11 @@ macro_rules! attempt {
 
 #[cfg(test)]
 mod tests {
-    use crate::attempt;
-    use crate::utils::AttemptResult;
     use std::time::Duration;
     use tokio::time::Instant;
 
+    use crate::utils::AttemptResult;
+
     const EMPTY_RESULT: Result<Option<()>, String> = Ok(None);
 
     #[tokio::test]