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

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}"
                     );
                 }
             }