tokio: avoid positional fmt params when possible (#6978)

tokio-util/src/codec/any_delimiter_codec.rs

@@ -249,7 +249,7 @@ impl fmt::Display for AnyDelimiterCodecError {
             AnyDelimiterCodecError::MaxChunkLengthExceeded => {
                 write!(f, "max chunk length exceeded")
             }
-            AnyDelimiterCodecError::Io(e) => write!(f, "{}", e),
+            AnyDelimiterCodecError::Io(e) => write!(f, "{e}"),
         }
     }
 }

tokio-util/src/codec/lines_codec.rs

@@ -218,7 +218,7 @@ impl fmt::Display for LinesCodecError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             LinesCodecError::MaxLineLengthExceeded => write!(f, "max line length exceeded"),
-            LinesCodecError::Io(e) => write!(f, "{}", e),
+            LinesCodecError::Io(e) => write!(f, "{e}"),
         }
     }
 }

tokio-util/src/task/spawn_pinned.rs

@@ -249,7 +249,7 @@ impl LocalPool {
             // Send the callback to the LocalSet task
             if let Err(e) = worker_spawner.send(spawn_task) {
                 // Propagate the error as a panic in the join handle.
-                panic!("Failed to send job to worker: {}", e);
+                panic!("Failed to send job to worker: {e}");
             }
 
             // Wait for the task's join handle
@@ -260,7 +260,7 @@ impl LocalPool {
                     // join handle... We assume something happened to the worker
                     // and the task was not spawned. Propagate the error as a
                     // panic in the join handle.
-                    panic!("Worker failed to send join handle: {}", e);
+                    panic!("Worker failed to send join handle: {e}");
                 }
             };
 
@@ -284,12 +284,12 @@ impl LocalPool {
                         // No one else should have the join handle, so this is
                         // unexpected. Forward this error as a panic in the join
                         // handle.
-                        panic!("spawn_pinned task was canceled: {}", e);
+                        panic!("spawn_pinned task was canceled: {e}");
                     } else {
                         // Something unknown happened (not a panic or
                         // cancellation). Forward this error as a panic in the
                         // join handle.
-                        panic!("spawn_pinned task failed: {}", e);
+                        panic!("spawn_pinned task failed: {e}");
                     }
                 }
             }

tokio-util/src/time/delay_queue.rs

@@ -665,7 +665,7 @@ impl<T> DelayQueue<T> {
                 // The delay is already expired, store it in the expired queue
                 self.expired.push(key, &mut self.slab);
             }
-            Err((_, err)) => panic!("invalid deadline; err={:?}", err),
+            Err((_, err)) => panic!("invalid deadline; err={err:?}"),
         }
     }
 

tokio-util/src/time/wheel/mod.rs

@@ -280,13 +280,7 @@ mod test {
     #[test]
     fn test_level_for() {
         for pos in 0..64 {
-            assert_eq!(
-                0,
-                level_for(0, pos),
-                "level_for({}) -- binary = {:b}",
-                pos,
-                pos
-            );
+            assert_eq!(0, level_for(0, pos), "level_for({pos}) -- binary = {pos:b}");
         }
 
         for level in 1..5 {
@@ -295,9 +289,7 @@ mod test {
                 assert_eq!(
                     level,
                     level_for(0, a as u64),
-                    "level_for({}) -- binary = {:b}",
-                    a,
-                    a
+                    "level_for({a}) -- binary = {a:b}"
                 );
 
                 if pos > level {
@@ -305,9 +297,7 @@ mod test {
                     assert_eq!(
                         level,
                         level_for(0, a as u64),
-                        "level_for({}) -- binary = {:b}",
-                        a,
-                        a
+                        "level_for({a}) -- binary = {a:b}"
                     );
                 }
 
@@ -316,9 +306,7 @@ mod test {
                     assert_eq!(
                         level,
                         level_for(0, a as u64),
-                        "level_for({}) -- binary = {:b}",
-                        a,
-                        a
+                        "level_for({a}) -- binary = {a:b}"
                     );
                 }
             }