refactor(lib): refactor redundant closure

Author: tottoto

src/extensions.rs

@@ -61,7 +61,7 @@ impl Extensions {
     /// ```
     pub fn insert<T: Clone + Send + Sync + 'static>(&mut self, val: T) -> Option<T> {
         self.map
-            .get_or_insert_with(|| Box::new(HashMap::default()))
+            .get_or_insert_with(Box::default)
             .insert(TypeId::of::<T>(), Box::new(val))
             .and_then(|boxed| boxed.into_any().downcast().ok().map(|boxed| *boxed))
     }
@@ -138,7 +138,7 @@ impl Extensions {
     ) -> &mut T {
         let out = self
             .map
-            .get_or_insert_with(|| Box::new(HashMap::default()))
+            .get_or_insert_with(Box::default)
             .entry(TypeId::of::<T>())
             .or_insert_with(|| Box::new(f()));
         (**out).as_any_mut().downcast_mut().unwrap()

src/uri/authority.rs

@@ -434,7 +434,7 @@ impl<'a> TryFrom<&'a [u8]> for Authority {
 
         // Preconditon on create_authority: copy_from_slice() copies all of
         // bytes from the [u8] parameter into a new Bytes
-        create_authority(s, |s| Bytes::copy_from_slice(s))
+        create_authority(s, Bytes::copy_from_slice)
     }
 }