refactor(lib): apply small refactoring

src/header/map.rs

@@ -705,12 +705,12 @@ impl<T> HeaderMap<T> {
             .entries
             .len()
             .checked_add(additional)
-            .ok_or_else(|| MaxSizeReached::new())?;
+            .ok_or_else(MaxSizeReached::new)?;
 
         if cap > self.indices.len() {
             let cap = cap
                 .checked_next_power_of_two()
-                .ok_or_else(|| MaxSizeReached::new())?;
+                .ok_or_else(MaxSizeReached::new)?;
             if cap > MAX_SIZE {
                 return Err(MaxSizeReached::new());
             }
@@ -1066,7 +1066,7 @@ impl<T> HeaderMap<T> {
         } else {
             ValueIter {
                 map: self,
-                index: ::std::usize::MAX,
+                index: usize::MAX,
                 front: None,
                 back: None,
             }
@@ -1449,9 +1449,9 @@ impl<T> HeaderMap<T> {
     }
 
     #[inline]
-    fn find<K: ?Sized>(&self, key: &K) -> Option<(usize, usize)>
+    fn find<K>(&self, key: &K) -> Option<(usize, usize)>
     where
-        K: Hash + Into<HeaderName>,
+        K: Hash + Into<HeaderName> + ?Sized,
         HeaderName: PartialEq<K>,
     {
         if self.entries.is_empty() {
@@ -3603,9 +3603,9 @@ fn probe_distance(mask: Size, hash: HashValue, current: usize) -> usize {
     current.wrapping_sub(desired_pos(mask, hash)) & mask as usize
 }
 
-fn hash_elem_using<K: ?Sized>(danger: &Danger, k: &K) -> HashValue
+fn hash_elem_using<K>(danger: &Danger, k: &K) -> HashValue
 where
-    K: Hash,
+    K: Hash + ?Sized,
 {
     use fnv::FnvHasher;
 
@@ -3838,7 +3838,7 @@ mod as_header_name {
     impl Sealed for String {
         #[inline]
         fn try_entry<T>(self, map: &mut HeaderMap<T>) -> Result<Entry<'_, T>, TryEntryError> {
-            Ok(self.as_str().try_entry(map)?)
+            self.as_str().try_entry(map)
         }
 
         #[inline]

src/header/name.rs

@@ -1274,7 +1274,7 @@ impl HeaderName {
             // https://blog.rust-lang.org/2021/12/02/Rust-1.57.0.html#panic-in-const-contexts
             //
             // See the panics section of this method's document for details.
-            #[allow(clippy::no_effect)]
+            #[allow(clippy::no_effect, clippy::out_of_bounds_indexing)]
             ([] as [u8; 0])[0]; // Invalid header name
         }
 

src/header/value.rs

@@ -91,7 +91,7 @@ impl HeaderValue {
                 // https://blog.rust-lang.org/2021/12/02/Rust-1.57.0.html#panic-in-const-contexts
                 //
                 // See the panics section of this method's document for details.
-                #[allow(clippy::no_effect)]
+                #[allow(clippy::no_effect, clippy::out_of_bounds_indexing)]
                 ([] as [u8; 0])[0]; // Invalid header value
             }
             i += 1;

src/uri/mod.rs

@@ -28,9 +28,9 @@ use std::convert::TryFrom;
 use bytes::Bytes;
 
 use std::error::Error;
+use std::fmt;
 use std::hash::{Hash, Hasher};
 use std::str::{self, FromStr};
-use std::{fmt, u16, u8};
 
 use self::scheme::Scheme2;
 

src/uri/path.rs

@@ -14,7 +14,7 @@ pub struct PathAndQuery {
     pub(super) query: u16,
 }
 
-const NONE: u16 = ::std::u16::MAX;
+const NONE: u16 = u16::MAX;
 
 impl PathAndQuery {
     // Not public while `bytes` is unstable.