diff --git a/crates/common/src/lib.rs b/crates/common/src/lib.rs
index c6c64d8137..300427ae07 100644
--- a/crates/common/src/lib.rs
+++ b/crates/common/src/lib.rs
@@ -424,7 +424,7 @@ impl ChainId {
     pub fn as_str(&self) -> &str {
         std::str::from_utf8(self.0.as_be_bytes())
             .expect("valid utf8")
-            .trim_start_matches(|c| c == '\0')
+            .trim_start_matches('\0')
     }
 
     pub const MAINNET: Self = Self::from_slice_unwrap(b"SN_MAIN");
diff --git a/crates/executor/src/simulate.rs b/crates/executor/src/simulate.rs
index d8abfc0386..b48803f7be 100644
--- a/crates/executor/src/simulate.rs
+++ b/crates/executor/src/simulate.rs
@@ -200,11 +200,10 @@ pub fn trace(
                 err
             })?;
         let state_diff =
-            to_state_diff(&mut tx_state, tx_declared_deprecated_class_hash).map_err(|e| {
+            to_state_diff(&mut tx_state, tx_declared_deprecated_class_hash).inspect_err(|e| {
                 // Remove the cache entry so it's no longer inflight.
                 let mut cache = cache.0.lock().unwrap();
                 cache.cache_remove(&block_hash);
-                e
             })?;
         tx_state.commit();
 
diff --git a/crates/gateway-client/src/metrics.rs b/crates/gateway-client/src/metrics.rs
index 98b71a4eb7..3de4ced705 100644
--- a/crates/gateway-client/src/metrics.rs
+++ b/crates/gateway-client/src/metrics.rs
@@ -166,10 +166,10 @@ pub async fn with_metrics<T>(
 
     metrics::histogram!(METRIC_REQUESTS_LATENCY, elapsed, "method" => meta.method);
 
-    result.map_err(|e| {
+    result.inspect_err(|e| {
         increment(METRIC_FAILED_REQUESTS, meta);
 
-        match &e {
+        match e {
             SequencerError::StarknetError(_) => {
                 increment_failed(meta, REASON_STARKNET);
             }
@@ -191,7 +191,5 @@ pub async fn with_metrics<T>(
             }
             SequencerError::ReqwestError(_) => {}
         }
-
-        e
     })
 }