Fix clippy::needless_lifetimes

Author: cuviper

src/map/iter.rs

@@ -819,7 +819,7 @@ where
 
 impl<K, V, F> FusedIterator for ExtractIf<'_, K, V, F> where F: FnMut(&K, &mut V) -> bool {}
 
-impl<'a, K, V, F> fmt::Debug for ExtractIf<'a, K, V, F>
+impl<K, V, F> fmt::Debug for ExtractIf<'_, K, V, F>
 where
     K: fmt::Debug,
     V: fmt::Debug,

src/set/iter.rs

@@ -671,7 +671,7 @@ where
 
 impl<T, F> FusedIterator for ExtractIf<'_, T, F> where F: FnMut(&T) -> bool {}
 
-impl<'a, T, F> fmt::Debug for ExtractIf<'a, T, F>
+impl<T, F> fmt::Debug for ExtractIf<'_, T, F>
 where
     T: fmt::Debug,
 {