diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 58adfa90c..a9826addb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -95,6 +95,7 @@ jobs:
             {
               echo "leak:dyld4::RuntimeState"
               echo "leak:fetchInitializingClassList"
+              echo "leak:std::sys::pal::unix::stack_overflow::imp::init"
             } > suppressions.txt
             export LSAN_OPTIONS="suppressions=$(pwd)/suppressions.txt"
           fi
diff --git a/data-url/src/lib.rs b/data-url/src/lib.rs
index d7ceeb111..00689e3d4 100644
--- a/data-url/src/lib.rs
+++ b/data-url/src/lib.rs
@@ -124,7 +124,7 @@ impl<'a> DataUrl<'a> {
 /// The URL’s fragment identifier (after `#`)
 pub struct FragmentIdentifier<'a>(&'a str);
 
-impl<'a> FragmentIdentifier<'a> {
+impl FragmentIdentifier<'_> {
     /// Like in a parsed URL
     pub fn to_percent_encoded(&self) -> String {
         let mut string = String::new();
@@ -165,10 +165,10 @@ fn pretend_parse_data_url(input: &str) -> Option<&str> {
         let mut iter = bytes
             .by_ref()
             .filter(|&byte| !matches!(byte, b'\t' | b'\n' | b'\r'));
-        require!(iter.next()?.to_ascii_lowercase() == b'd');
-        require!(iter.next()?.to_ascii_lowercase() == b'a');
-        require!(iter.next()?.to_ascii_lowercase() == b't');
-        require!(iter.next()?.to_ascii_lowercase() == b'a');
+        require!(iter.next()?.eq_ignore_ascii_case(&b'd'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b'a'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b't'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b'a'));
         require!(iter.next()? == b':');
     }
     let bytes_consumed = left_trimmed.len() - bytes.len();
@@ -256,10 +256,10 @@ fn remove_base64_suffix(s: &str) -> Option<&str> {
 
         require!(iter.next()? == b'4');
         require!(iter.next()? == b'6');
-        require!(iter.next()?.to_ascii_lowercase() == b'e');
-        require!(iter.next()?.to_ascii_lowercase() == b's');
-        require!(iter.next()?.to_ascii_lowercase() == b'a');
-        require!(iter.next()?.to_ascii_lowercase() == b'b');
+        require!(iter.next()?.eq_ignore_ascii_case(&b'e'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b's'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b'a'));
+        require!(iter.next()?.eq_ignore_ascii_case(&b'b'));
         require!(iter.skip_while(|&byte| byte == b' ').next()? == b';');
     }
     Some(&s[..bytes.len()])
diff --git a/form_urlencoded/src/lib.rs b/form_urlencoded/src/lib.rs
index 1d68579b7..1d9582249 100644
--- a/form_urlencoded/src/lib.rs
+++ b/form_urlencoded/src/lib.rs
@@ -104,7 +104,7 @@ pub struct ParseIntoOwned<'a> {
     inner: Parse<'a>,
 }
 
-impl<'a> Iterator for ParseIntoOwned<'a> {
+impl Iterator for ParseIntoOwned<'_> {
     type Item = (String, String);
 
     fn next(&mut self) -> Option<Self::Item> {
@@ -195,7 +195,7 @@ impl Target for String {
     type Finished = Self;
 }
 
-impl<'a> Target for &'a mut String {
+impl Target for &mut String {
     fn as_mut_string(&mut self) -> &mut String {
         self
     }
diff --git a/idna/src/punycode.rs b/idna/src/punycode.rs
index 842d81940..7194c32c6 100644
--- a/idna/src/punycode.rs
+++ b/idna/src/punycode.rs
@@ -277,7 +277,7 @@ where
     phantom: PhantomData<C>,
 }
 
-impl<'a, T: PunycodeCodeUnit + Copy, C: PunycodeCaller> Iterator for Decode<'a, T, C> {
+impl<T: PunycodeCodeUnit + Copy, C: PunycodeCaller> Iterator for Decode<'_, T, C> {
     type Item = char;
 
     fn next(&mut self) -> Option<Self::Item> {
@@ -309,7 +309,7 @@ impl<'a, T: PunycodeCodeUnit + Copy, C: PunycodeCaller> Iterator for Decode<'a,
     }
 }
 
-impl<'a, T: PunycodeCodeUnit + Copy, C: PunycodeCaller> ExactSizeIterator for Decode<'a, T, C> {
+impl<T: PunycodeCodeUnit + Copy, C: PunycodeCaller> ExactSizeIterator for Decode<'_, T, C> {
     fn len(&self) -> usize {
         self.len - self.position
     }
diff --git a/percent_encoding/src/lib.rs b/percent_encoding/src/lib.rs
index 11b6296e6..f4b23af61 100644
--- a/percent_encoding/src/lib.rs
+++ b/percent_encoding/src/lib.rs
@@ -181,7 +181,7 @@ impl<'a> Iterator for PercentEncode<'a> {
     }
 }
 
-impl<'a> fmt::Display for PercentEncode<'a> {
+impl fmt::Display for PercentEncode<'_> {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
         for c in (*self).clone() {
             formatter.write_str(c)?
@@ -257,7 +257,7 @@ fn after_percent_sign(iter: &mut slice::Iter<'_, u8>) -> Option<u8> {
     Some(h as u8 * 0x10 + l as u8)
 }
 
-impl<'a> Iterator for PercentDecode<'a> {
+impl Iterator for PercentDecode<'_> {
     type Item = u8;
 
     fn next(&mut self) -> Option<u8> {
diff --git a/url/src/host.rs b/url/src/host.rs
index f21a253d5..f45232c5d 100644
--- a/url/src/host.rs
+++ b/url/src/host.rs
@@ -64,7 +64,7 @@ pub enum Host<S = String> {
     Ipv6(Ipv6Addr),
 }
 
-impl<'a> Host<&'a str> {
+impl Host<&str> {
     /// Return a copy of `self` that owns an allocated `String` but does not borrow an `&Url`.
     pub fn to_owned(&self) -> Host<String> {
         match *self {
diff --git a/url/src/lib.rs b/url/src/lib.rs
index e015acce7..96fa1eee7 100644
--- a/url/src/lib.rs
+++ b/url/src/lib.rs
@@ -448,7 +448,7 @@ impl Url {
     /// let base = Url::parse("https://alice.com/a")?;
     /// let url = base.join("http://eve.com/b")?;
     /// assert_eq!(url.as_str(), "http://eve.com/b");  // http instead of https
-
+    ///
     /// # Ok(())
     /// # }
     /// # run().unwrap();
@@ -1492,7 +1492,6 @@ impl Url {
     /// # }
     /// # run().unwrap();
     /// ```
-
     #[inline]
     pub fn query_pairs(&self) -> form_urlencoded::Parse<'_> {
         form_urlencoded::parse(self.query().unwrap_or("").as_bytes())
@@ -1555,7 +1554,7 @@ impl Url {
     /// # fn run() -> Result<(), ParseError> {
     /// let mut url = Url::parse("https://example.com/data.csv")?;
     /// assert_eq!(url.as_str(), "https://example.com/data.csv");
-
+    ///
     /// url.set_fragment(Some("cell=4,1-6,2"));
     /// assert_eq!(url.as_str(), "https://example.com/data.csv#cell=4,1-6,2");
     /// assert_eq!(url.fragment(), Some("cell=4,1-6,2"));
@@ -2674,8 +2673,7 @@ impl Url {
             fragment_start,
         };
         if cfg!(debug_assertions) {
-            url.check_invariants()
-                .map_err(|reason| Error::custom(reason))?
+            url.check_invariants().map_err(Error::custom)?
         }
         Ok(url)
     }
@@ -2892,7 +2890,7 @@ impl<'de> serde::Deserialize<'de> for Url {
 
         struct UrlVisitor;
 
-        impl<'de> Visitor<'de> for UrlVisitor {
+        impl Visitor<'_> for UrlVisitor {
             type Value = Url;
 
             fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
@@ -3177,7 +3175,7 @@ impl<'a> form_urlencoded::Target for UrlQuery<'a> {
     type Finished = &'a mut Url;
 }
 
-impl<'a> Drop for UrlQuery<'a> {
+impl Drop for UrlQuery<'_> {
     fn drop(&mut self) {
         if let Some(url) = self.url.take() {
             url.restore_already_parsed_fragment(self.fragment.take())
diff --git a/url/src/parser.rs b/url/src/parser.rs
index e26b50281..416484f19 100644
--- a/url/src/parser.rs
+++ b/url/src/parser.rs
@@ -301,7 +301,7 @@ impl Pattern for char {
     }
 }
 
-impl<'a> Pattern for &'a str {
+impl Pattern for &str {
     fn split_prefix(self, input: &mut Input) -> bool {
         for c in self.chars() {
             if input.next() != Some(c) {
@@ -318,7 +318,7 @@ impl<F: FnMut(char) -> bool> Pattern for F {
     }
 }
 
-impl<'i> Iterator for Input<'i> {
+impl Iterator for Input<'_> {
     type Item = char;
     fn next(&mut self) -> Option<char> {
         self.chars
diff --git a/url/src/path_segments.rs b/url/src/path_segments.rs
index 5cc8e7758..e6363c5c8 100644
--- a/url/src/path_segments.rs
+++ b/url/src/path_segments.rs
@@ -67,14 +67,14 @@ pub fn new(url: &mut Url) -> PathSegmentsMut<'_> {
     }
 }
 
-impl<'a> Drop for PathSegmentsMut<'a> {
+impl Drop for PathSegmentsMut<'_> {
     fn drop(&mut self) {
         self.url
             .restore_after_path(self.old_after_path_position, &self.after_path)
     }
 }
 
-impl<'a> PathSegmentsMut<'a> {
+impl PathSegmentsMut<'_> {
     /// Remove all segments in the path, leaving the minimal `url.path() == "/"`.
     ///
     /// Returns `&mut Self` so that method calls can be chained.