Fix issues found by rust-clippy

23 files changed, 106 insertions, 121 deletions

diff --git a/components/canvas/canvas_paint_task.rs b/components/canvas/canvas_paint_task.rs
index dadc37aefd1..4244e27d6af 100644
--- a/components/canvas/canvas_paint_task.rs
+++ b/components/canvas/canvas_paint_task.rs
@@ -756,7 +756,7 @@ fn is_zero_size_gradient(pattern: &Pattern) -> bool {
             return true;
         }
     }
-    return false;
+    false
 }
 
 pub trait PointToi32 {
diff --git a/components/gfx/platform/macos/font.rs b/components/gfx/platform/macos/font.rs
index f316dd4d985..c9e464a0eb2 100644
--- a/components/gfx/platform/macos/font.rs
+++ b/components/gfx/platform/macos/font.rs
@@ -178,7 +178,7 @@ impl FontHandleMethods for FontHandle {
         let max_advance_width = au_from_pt(bounding_rect.size.width as f64);
         let average_advance = self.glyph_index('0')
                                   .and_then(|idx| self.glyph_h_advance(idx))
-                                  .map(|advance| Au::from_f64_px(advance))
+                                  .map(Au::from_f64_px)
                                   .unwrap_or(max_advance_width);
 
         let metrics =  FontMetrics {
@@ -201,7 +201,7 @@ impl FontHandleMethods for FontHandle {
             line_gap:         Au::from_f64_px(line_gap),
         };
         debug!("Font metrics (@{} pt): {:?}", self.ctfont.pt_size() as f64, metrics);
-        return metrics;
+        metrics
     }
 
     fn table_for_tag(&self, tag: FontTableTag) -> Option<Box<FontTable>> {
diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs
index 06a26863cff..cd05ff04572 100644
--- a/components/layout/fragment.rs
+++ b/components/layout/fragment.rs
@@ -1479,7 +1479,7 @@ impl Fragment {
                 let character_breaking_strategy =
                     text_fragment_info.run.character_slices_in_range(&text_fragment_info.range);
                 flags.remove(RETRY_AT_CHARACTER_BOUNDARIES);
-                return self.calculate_split_position_using_breaking_strategy(
+                self.calculate_split_position_using_breaking_strategy(
                     character_breaking_strategy,
                     max_inline_size,
                     flags)
@@ -1685,7 +1685,7 @@ impl Fragment {
 
     /// Assigns replaced inline-size, padding, and margins for this fragment only if it is replaced
     /// content per CSS 2.1 § 10.3.2.
-    pub fn assign_replaced_inline_size_if_necessary<'a>(&'a mut self, container_inline_size: Au) {
+    pub fn assign_replaced_inline_size_if_necessary(&mut self, container_inline_size: Au) {
         match self.specific {
             SpecificFragmentInfo::Generic |
             SpecificFragmentInfo::GeneratedContent(_) |
@@ -2257,7 +2257,7 @@ impl Fragment {
                     CharIndex(leading_whitespace_character_count),
                     -CharIndex(leading_whitespace_character_count));
 
-                return WhitespaceStrippingResult::RetainFragment
+                WhitespaceStrippingResult::RetainFragment
             }
             SpecificFragmentInfo::UnscannedText(ref mut unscanned_text_fragment_info) => {
                 let mut new_text_string = String::new();
diff --git a/components/layout/generated_content.rs b/components/layout/generated_content.rs
index 2d43e596bce..686d9ec3920 100644
--- a/components/layout/generated_content.rs
+++ b/components/layout/generated_content.rs
@@ -184,11 +184,11 @@ impl<'a,'b> ResolveGeneratedContentFragmentMutator<'a,'b> {
                 }
                 GeneratedContentInfo::ContentItem(ContentItem::Counter(ref counter_name,
                                                                        counter_style)) => {
-                    let mut temporary_counter = Counter::new();
+                    let temporary_counter = Counter::new();
                     let counter = self.traversal
                                       .counters
                                       .get(&*counter_name)
-                                      .unwrap_or(&mut temporary_counter);
+                                      .unwrap_or(&temporary_counter);
                     new_info = counter.render(self.traversal.layout_context,
                                               fragment.node,
                                               fragment.pseudo.clone(),
@@ -199,11 +199,11 @@ impl<'a,'b> ResolveGeneratedContentFragmentMutator<'a,'b> {
                 GeneratedContentInfo::ContentItem(ContentItem::Counters(ref counter_name,
                                                                         ref separator,
                                                                         counter_style)) => {
-                    let mut temporary_counter = Counter::new();
+                    let temporary_counter = Counter::new();
                     let counter = self.traversal
                                       .counters
                                       .get(&*counter_name)
-                                      .unwrap_or(&mut temporary_counter);
+                                      .unwrap_or(&temporary_counter);
                     new_info = counter.render(self.traversal.layout_context,
                                               fragment.node,
                                               fragment.pseudo,
diff --git a/components/layout/layout_task.rs b/components/layout/layout_task.rs
index dbcea19abc8..a0ffd5d9549 100644
--- a/components/layout/layout_task.rs
+++ b/components/layout/layout_task.rs
@@ -1452,7 +1452,7 @@ impl LayoutTask {
                         // Parallel mode.
                         self.solve_constraints_parallel(parallel,
                                                         &mut root_flow,
-                                                        &mut *layout_context);
+                                                        &*layout_context);
                     }
                 }
             });
diff --git a/components/net/cookie.rs b/components/net/cookie.rs
index 0bc77eae251..67e95661c77 100644
--- a/components/net/cookie.rs
+++ b/components/net/cookie.rs
@@ -154,7 +154,7 @@ impl Cookie {
             }
         }
 
-        if self.cookie.secure && url.scheme != "https".to_owned() {
+        if self.cookie.secure && url.scheme != "https" {
             return false;
         }
         if self.cookie.httponly && source == CookieSource::NonHTTP {
diff --git a/components/net/http_loader.rs b/components/net/http_loader.rs
index 2be8ef0ab70..7713b7b3e73 100644
--- a/components/net/http_loader.rs
+++ b/components/net/http_loader.rs
@@ -75,10 +75,9 @@ fn send_error(url: Url, err: String, start_chan: LoadConsumer) {
     let mut metadata: Metadata = Metadata::default(url);
     metadata.status = None;
 
-    match start_sending_opt(start_chan, metadata) {
-        Ok(p) => p.send(Done(Err(err))).unwrap(),
-        _ => {}
-    };
+    if let Ok(p) = start_sending_opt(start_chan, metadata) {
+        p.send(Done(Err(err))).unwrap();
+    }
 }
 
 enum ReadResult {
@@ -157,8 +156,8 @@ pub trait HttpResponse: Read {
 
     fn content_encoding(&self) -> Option<Encoding> {
         self.headers().get::<ContentEncoding>().and_then(|h| {
-            match h {
-                &ContentEncoding(ref encodings) => {
+            match *h {
+                ContentEncoding(ref encodings) => {
                     if encodings.contains(&Encoding::Gzip) {
                         Some(Encoding::Gzip)
                     } else if encodings.contains(&Encoding::Deflate) {
diff --git a/components/net/resource_task.rs b/components/net/resource_task.rs
index 1631b5a8e7d..62dc75315db 100644
--- a/components/net/resource_task.rs
+++ b/components/net/resource_task.rs
@@ -173,7 +173,7 @@ impl ResourceChannelManager {
                     self.resource_manager.set_cookies_for_url(request, cookie_list, source)
                 }
                 ControlMsg::GetCookiesForUrl(url, consumer, source) => {
-                    let ref cookie_jar = self.resource_manager.cookie_storage;
+                    let cookie_jar = &self.resource_manager.cookie_storage;
                     let mut cookie_jar = cookie_jar.write().unwrap();
                     consumer.send(cookie_jar.cookies_for_url(&url, source)).unwrap();
                 }
@@ -215,7 +215,7 @@ impl ResourceManager {
         if let Ok(SetCookie(cookies)) = header {
             for bare_cookie in cookies {
                 if let Some(cookie) = cookie::Cookie::new_wrapped(bare_cookie, &request, source) {
-                    let ref cookie_jar = self.cookie_storage;
+                    let cookie_jar = &self.cookie_storage;
                     let mut cookie_jar = cookie_jar.write().unwrap();
                     cookie_jar.push(cookie, source);
                 }
diff --git a/components/profile/mem.rs b/components/profile/mem.rs
index b0736ff961d..0bd91f7afed 100644
--- a/components/profile/mem.rs
+++ b/components/profile/mem.rs
@@ -74,15 +74,10 @@ impl Profiler {
     }
 
     pub fn start(&mut self) {
-        loop {
-            match self.port.recv() {
-               Ok(msg) => {
-                   if !self.handle_msg(msg) {
-                       break
-                   }
-               }
-               _ => break
-            }
+        while let Ok(msg) = self.port.recv() {
+           if !self.handle_msg(msg) {
+               break
+           }
         }
     }
 
diff --git a/components/profile/time.rs b/components/profile/time.rs
index e3c38827012..43afb37ae17 100644
--- a/components/profile/time.rs
+++ b/components/profile/time.rs
@@ -22,9 +22,9 @@ pub trait Formattable {
 
 impl Formattable for Option<TimerMetadata> {
     fn format(&self) -> String {
-        match self {
+        match *self {
             // TODO(cgaebel): Center-align in the format strings as soon as rustc supports it.
-            &Some(ref meta) => {
+            Some(ref meta) => {
                 let url = &*meta.url;
                 let url = if url.len() > 30 {
                     &url[..30]
@@ -35,7 +35,7 @@ impl Formattable for Option<TimerMetadata> {
                 let iframe = if meta.iframe { "  yes" } else { "  no " };
                 format!(" {:14} {:9} {:30}", incremental, iframe, url)
             },
-            &None =>
+            None =>
                 format!(" {:14} {:9} {:30}", "    N/A", "  N/A", "             N/A")
         }
     }
@@ -198,16 +198,10 @@ impl Profiler {
     }
 
     pub fn start(&mut self) {
-        loop {
-            let msg = self.port.recv();
-            match msg {
-               Ok(msg) => {
-                   if !self.handle_msg(msg) {
-                       break
-                   }
-               }
-               _ => break
-            }
+        while let Ok(msg) = self.port.recv() {
+           if !self.handle_msg(msg) {
+               break
+           }
         }
     }
 
@@ -227,10 +221,9 @@ impl Profiler {
                 let ms = (t.1 - t.0) as f64 / 1000000f64;
                 self.find_or_insert(k, ms);
             },
-            ProfilerMsg::Print => match self.last_msg {
+            ProfilerMsg::Print => if let Some(ProfilerMsg::Time(..)) = self.last_msg {
                 // only print if more data has arrived since the last printout
-                Some(ProfilerMsg::Time(..)) => self.print_buckets(),
-                _ => ()
+                self.print_buckets();
             },
             ProfilerMsg::Exit => {
                 heartbeats::cleanup();
diff --git a/components/profile_traits/time.rs b/components/profile_traits/time.rs
index 681c171d449..4056ee295d9 100644
--- a/components/profile_traits/time.rs
+++ b/components/profile_traits/time.rs
@@ -112,5 +112,5 @@ pub fn profile<T, F>(category: ProfilerCategory,
     profiler_chan.send(ProfilerMsg::Time((category, meta),
                                          (start_time, end_time),
                                          (start_energy, end_energy)));
-    return val;
+    val
 }
diff --git a/components/style/viewport.rs b/components/style/viewport.rs
index 3d3935ecb23..0dc10e70052 100644
--- a/components/style/viewport.rs
+++ b/components/style/viewport.rs
@@ -95,7 +95,7 @@ impl ViewportLength {
 }
 
 impl FromMeta for Zoom {
-    fn from_meta<'a>(value: &'a str) -> Option<Zoom> {
+    fn from_meta(value: &str) -> Option<Zoom> {
         Some(match value {
             v if v.eq_ignore_ascii_case("yes") => Zoom::Number(1.),
             v if v.eq_ignore_ascii_case("no") => Zoom::Number(0.1),
@@ -113,7 +113,7 @@ impl FromMeta for Zoom {
 }
 
 impl FromMeta for UserZoom {
-    fn from_meta<'a>(value: &'a str) -> Option<UserZoom> {
+    fn from_meta(value: &str) -> Option<UserZoom> {
         Some(match value {
             v if v.eq_ignore_ascii_case("yes") => UserZoom::Zoom,
             v if v.eq_ignore_ascii_case("no") => UserZoom::Fixed,
@@ -377,13 +377,13 @@ impl ViewportRule {
                                start: usize)
                                -> Option<(&'a str, &'a str)>
     {
-        fn end_of_token<'a>(iter: &mut Enumerate<Chars<'a>>) -> Option<(usize, char)> {
+        fn end_of_token(iter: &mut Enumerate<Chars>) -> Option<(usize, char)> {
             iter.by_ref()
                 .skip_while(|&(_, c)| !is_whitespace_separator_or_equals(&c))
                 .next()
         }
 
-        fn skip_whitespace<'a>(iter: &mut Enumerate<Chars<'a>>) -> Option<(usize, char)> {
+        fn skip_whitespace(iter: &mut Enumerate<Chars>) -> Option<(usize, char)> {
             iter.by_ref()
                 .skip_while(|&(_, c)| WHITESPACE.contains(&c))
                 .next()
diff --git a/components/util/cache.rs b/components/util/cache.rs
index 4bb02353702..7a3dcfa980f 100644
--- a/components/util/cache.rs
+++ b/components/util/cache.rs
@@ -76,7 +76,7 @@ impl<K: Clone + PartialEq, V: Clone> LRUCache<K, V> {
         self.entries[last_index].1.clone()
     }
 
-    pub fn iter<'a>(&'a self) -> Iter<'a, (K, V)> {
+    pub fn iter(&self) -> Iter<(K, V)> {
         self.entries.iter()
     }
 
diff --git a/components/util/cursor.rs b/components/util/cursor.rs
index 8e4ca9e3c1c..bda254861e2 100644
--- a/components/util/cursor.rs
+++ b/components/util/cursor.rs
@@ -26,8 +26,8 @@ macro_rules! define_cursor {
 
         impl ToCss for Cursor {
             fn to_css<W>(&self, dest: &mut W) -> ::std::fmt::Result where W: ::std::fmt::Write {
-                match self {
-                    $( &Cursor::$variant => dest.write_str($css) ),+
+                match *self {
+                    $( Cursor::$variant => dest.write_str($css) ),+
                 }
             }
         }
diff --git a/components/util/deque/mod.rs b/components/util/deque/mod.rs
index 3764fbf933d..7ee26c9f2bf 100644
--- a/components/util/deque/mod.rs
+++ b/components/util/deque/mod.rs
@@ -197,7 +197,7 @@ impl<T: Send + 'static> Worker<T> {
     /// Gets access to the buffer pool that this worker is attached to. This can
     /// be used to create more deques which share the same buffer pool as this
     /// deque.
-    pub fn pool<'a>(&'a self) -> &'a BufferPool<T> {
+    pub fn pool(&self) -> &BufferPool<T> {
         &self.deque.pool
     }
 }
@@ -211,7 +211,7 @@ impl<T: Send + 'static> Stealer<T> {
     /// Gets access to the buffer pool that this stealer is attached to. This
     /// can be used to create more deques which share the same buffer pool as
     /// this deque.
-    pub fn pool<'a>(&'a self) -> &'a BufferPool<T> {
+    pub fn pool(&self) -> &BufferPool<T> {
         &self.deque.pool
     }
 }
@@ -270,11 +270,11 @@ impl<T: Send + 'static> Deque<T> {
         }
         if self.top.compare_and_swap(t, t + 1, SeqCst) == t {
             self.bottom.store(t + 1, SeqCst);
-            return Some(data);
+            Some(data)
         } else {
             self.bottom.store(t + 1, SeqCst);
             forget(data); // someone else stole this value
-            return None;
+            None
         }
     }
 
@@ -325,7 +325,7 @@ impl<T: Send + 'static> Deque<T> {
             self.bottom.store(b, SeqCst);
         }
         self.pool.free(transmute(old));
-        return newbuf;
+        newbuf
     }
 }
 
@@ -393,7 +393,7 @@ impl<T> Buffer<T> {
         for i in t..b {
             buf.put(i, self.get(i));
         }
-        return buf;
+        buf
     }
 }
 
diff --git a/components/util/mem.rs b/components/util/mem.rs
index 0243dd671b9..1577ff39dc2 100644
--- a/components/util/mem.rs
+++ b/components/util/mem.rs
@@ -123,9 +123,9 @@ impl HeapSizeOf for url::Url {
 
 impl HeapSizeOf for url::SchemeData {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &url::SchemeData::Relative(ref data) => data.heap_size_of_children(),
-            &url::SchemeData::NonRelative(ref str) => str.heap_size_of_children()
+        match *self {
+            url::SchemeData::Relative(ref data) => data.heap_size_of_children(),
+            url::SchemeData::NonRelative(ref str) => str.heap_size_of_children()
         }
     }
 }
@@ -147,9 +147,9 @@ impl HeapSizeOf for url::RelativeSchemeData {
 
 impl HeapSizeOf for url::Host {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &url::Host::Domain(ref str) => str.heap_size_of_children(),
-            &url::Host::Ipv6(_) => 0
+        match *self {
+            url::Host::Domain(ref str) => str.heap_size_of_children(),
+            url::Host::Ipv6(_) => 0
         }
     }
 }
@@ -302,8 +302,8 @@ impl<T: Copy + GCMethods<T>> HeapSizeOf for Heap<T> {
 
 impl HeapSizeOf for Method {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &Method::Extension(ref str) => str.heap_size_of_children(),
+        match *self {
+            Method::Extension(ref str) => str.heap_size_of_children(),
             _ => 0
         }
     }
@@ -311,9 +311,9 @@ impl HeapSizeOf for Method {
 
 impl<T: HeapSizeOf, U: HeapSizeOf> HeapSizeOf for Result<T, U> {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &Result::Ok(ref ok) => ok.heap_size_of_children(),
-            &Result::Err(ref err) => err.heap_size_of_children()
+        match *self {
+            Result::Ok(ref ok) => ok.heap_size_of_children(),
+            Result::Err(ref err) => err.heap_size_of_children()
         }
     }
 }
@@ -341,13 +341,13 @@ impl HeapSizeOf for CompoundSelector {
 
 impl HeapSizeOf for SimpleSelector {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &SimpleSelector::Negation(ref vec) => vec.heap_size_of_children(),
-            &SimpleSelector::AttrIncludes(_, ref str) | &SimpleSelector::AttrPrefixMatch(_, ref str) |
-            &SimpleSelector::AttrSubstringMatch(_, ref str) | &SimpleSelector::AttrSuffixMatch(_, ref str)
+        match *self {
+            SimpleSelector::Negation(ref vec) => vec.heap_size_of_children(),
+            SimpleSelector::AttrIncludes(_, ref str) | SimpleSelector::AttrPrefixMatch(_, ref str) |
+            SimpleSelector::AttrSubstringMatch(_, ref str) | SimpleSelector::AttrSuffixMatch(_, ref str)
             => str.heap_size_of_children(),
-            &SimpleSelector::AttrEqual(_, ref str, _) => str.heap_size_of_children(),
-            &SimpleSelector::AttrDashMatch(_, ref first, ref second) => first.heap_size_of_children()
+            SimpleSelector::AttrEqual(_, ref str, _) => str.heap_size_of_children(),
+            SimpleSelector::AttrDashMatch(_, ref first, ref second) => first.heap_size_of_children()
             + second.heap_size_of_children(),
             // All other types come down to Atom, enum or i32, all 0
             _ => 0
@@ -372,8 +372,8 @@ impl HeapSizeOf for Mime {
 
 impl HeapSizeOf for TopLevel {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &TopLevel::Ext(ref str) => str.heap_size_of_children(),
+        match *self {
+            TopLevel::Ext(ref str) => str.heap_size_of_children(),
             _ => 0
         }
     }
@@ -381,8 +381,8 @@ impl HeapSizeOf for TopLevel {
 
 impl HeapSizeOf for SubLevel {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &SubLevel::Ext(ref str) => str.heap_size_of_children(),
+        match *self {
+            SubLevel::Ext(ref str) => str.heap_size_of_children(),
             _ => 0
         }
     }
@@ -390,8 +390,8 @@ impl HeapSizeOf for SubLevel {
 
 impl HeapSizeOf for Attr {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &Attr::Ext(ref str) => str.heap_size_of_children(),
+        match *self {
+            Attr::Ext(ref str) => str.heap_size_of_children(),
             _ => 0
         }
     }
@@ -399,8 +399,8 @@ impl HeapSizeOf for Attr {
 
 impl HeapSizeOf for Value {
     fn heap_size_of_children(&self) -> usize {
-        match self {
-            &Value::Ext(ref str) => str.heap_size_of_children(),
+        match *self {
+            Value::Ext(ref str) => str.heap_size_of_children(),
             _ => 0
         }
     }
diff --git a/components/util/opts.rs b/components/util/opts.rs
index d3b25743431..ea1d9609264 100644
--- a/components/util/opts.rs
+++ b/components/util/opts.rs
@@ -257,7 +257,7 @@ pub struct DebugOptions {
 
 
 impl DebugOptions {
-    pub fn new<'a>(debug_string: &'a str) -> Result<DebugOptions, &'a str> {
+    pub fn new(debug_string: &str) -> Result<DebugOptions, &str> {
         let mut debug_options = DebugOptions::default();
 
         for option in debug_string.split(',') {
diff --git a/components/util/persistent_list.rs b/components/util/persistent_list.rs
index 9043fe76e54..210606f1d5d 100644
--- a/components/util/persistent_list.rs
+++ b/components/util/persistent_list.rs
@@ -49,7 +49,7 @@ impl<T> PersistentList<T> where T: Send + Sync {
     }
 
     #[inline]
-    pub fn iter<'a>(&'a self) -> PersistentListIterator<'a, T> {
+    pub fn iter(&self) -> PersistentListIterator<T> {
         // This could clone (and would not need the lifetime if it did), but then it would incur
         // atomic operations on every call to `.next()`. Bad.
         PersistentListIterator {
@@ -90,4 +90,3 @@ impl<'a, T> Iterator for PersistentListIterator<'a, T> where T: Send + Sync + 's
         Some(value)
     }
 }
-
diff --git a/components/util/prefs.rs b/components/util/prefs.rs
index 9762e1865af..b73bf9158d9 100644
--- a/components/util/prefs.rs
+++ b/components/util/prefs.rs
@@ -34,8 +34,8 @@ impl PrefValue {
     }
 
     pub fn as_boolean(&self) -> Option<bool> {
-        match self {
-            &PrefValue::Boolean(value) => {
+        match *self {
+            PrefValue::Boolean(value) => {
                 Some(value)
             },
             _ => None
@@ -87,12 +87,12 @@ impl Pref {
     }
 
     pub fn value(&self) -> &Arc<PrefValue> {
-        match self {
-            &Pref::NoDefault(ref x) => x,
-            &Pref::WithDefault(ref default, ref override_value) => {
-                match override_value {
-                    &Some(ref x) => x,
-                    &None => default
+        match *self {
+            Pref::NoDefault(ref x) => x,
+            Pref::WithDefault(ref default, ref override_value) => {
+                match *override_value {
+                    Some(ref x) => x,
+                    None => default
                 }
             }
         }
@@ -101,11 +101,11 @@ impl Pref {
     fn set(&mut self, value: PrefValue) {
         // TODO - this should error if we try to override a pref of one type
         // with a value of a different type
-        match self {
-            &mut Pref::NoDefault(ref mut pref_value) => {
+        match *self {
+            Pref::NoDefault(ref mut pref_value) => {
                 *pref_value = Arc::new(value)
             },
-            &mut Pref::WithDefault(_, ref mut override_value) => {
+            Pref::WithDefault(_, ref mut override_value) => {
                 *override_value = Some(Arc::new(value))
             }
         }
diff --git a/components/util/str.rs b/components/util/str.rs
index ef84853493c..35f7ff4efcf 100644
--- a/components/util/str.rs
+++ b/components/util/str.rs
@@ -97,7 +97,7 @@ fn do_parse_integer<T: Iterator<Item=char>>(input: T) -> Option<i64> {
 
     let value = read_numbers(input);
 
-    return value.and_then(|value| value.checked_mul(sign));
+    value.and_then(|value| value.checked_mul(sign))
 }
 
 /// Parse an integer according to
@@ -244,9 +244,8 @@ pub fn parse_legacy_color(mut input: &str) -> Result<RGBA, ()> {
     }
 
     // Step 5.
-    match cssparser::parse_color_keyword(input) {
-        Ok(Color::RGBA(rgba)) => return Ok(rgba),
-        _ => {}
+    if let Ok(Color::RGBA(rgba)) = cssparser::parse_color_keyword(input) {
+        return Ok(rgba);
     }
 
     // Step 6.
diff --git a/components/util/vec.rs b/components/util/vec.rs
index 808aeb96479..ce4ac1f570a 100644
--- a/components/util/vec.rs
+++ b/components/util/vec.rs
@@ -52,7 +52,7 @@ impl<T> FullBinarySearchMethods<T> for [T] {
                 Ordering::Equal => return Some(mid),
             }
         }
-        return None;
+        None
     }
 }
 
diff --git a/components/util/workqueue.rs b/components/util/workqueue.rs
index af481312f21..26125335b3e 100644
--- a/components/util/workqueue.rs
+++ b/components/util/workqueue.rs
@@ -259,13 +259,13 @@ impl<QueueData: Sync, WorkData: Send> WorkQueue<QueueData, WorkData> {
         }
 
         // Connect workers to one another.
-        for i in 0..thread_count {
-            for j in 0..thread_count {
+        for (i, mut thread) in threads.iter_mut().enumerate() {
+            for (j, info) in infos.iter().enumerate() {
                 if i != j {
-                    threads[i].other_deques.push(infos[j].thief.clone())
+                    thread.other_deques.push(info.thief.clone())
                 }
             }
-            assert!(threads[i].other_deques.len() == thread_count - 1)
+            assert!(thread.other_deques.len() == thread_count - 1)
         }
 
         // Spawn threads.
diff --git a/components/webdriver_server/lib.rs b/components/webdriver_server/lib.rs
index c00f36c070a..497c827ea02 100644
--- a/components/webdriver_server/lib.rs
+++ b/components/webdriver_server/lib.rs
@@ -87,16 +87,16 @@ impl WebDriverExtensionRoute for ServoExtensionRoute {
     fn command(&self,
                _captures: &Captures,
                body_data: &Json) -> WebDriverResult<WebDriverCommand<ServoExtensionCommand>> {
-        let command = match self {
-            &ServoExtensionRoute::GetPrefs => {
+        let command = match *self {
+            ServoExtensionRoute::GetPrefs => {
                 let parameters: GetPrefsParameters = try!(Parameters::from_json(&body_data));
                 ServoExtensionCommand::GetPrefs(parameters)
             }
-            &ServoExtensionRoute::SetPrefs => {
+            ServoExtensionRoute::SetPrefs => {
                 let parameters: SetPrefsParameters = try!(Parameters::from_json(&body_data));
                 ServoExtensionCommand::SetPrefs(parameters)
             }
-            &ServoExtensionRoute::ResetPrefs => {
+            ServoExtensionRoute::ResetPrefs => {
                 let parameters: GetPrefsParameters = try!(Parameters::from_json(&body_data));
                 ServoExtensionCommand::ResetPrefs(parameters)
             }
@@ -114,10 +114,10 @@ enum ServoExtensionCommand {
 
 impl WebDriverExtensionCommand for ServoExtensionCommand {
     fn parameters_json(&self) -> Option<Json> {
-        match self {
-            &ServoExtensionCommand::GetPrefs(ref x) => Some(x.to_json()),
-            &ServoExtensionCommand::SetPrefs(ref x) => Some(x.to_json()),
-            &ServoExtensionCommand::ResetPrefs(ref x) => Some(x.to_json()),
+        match *self {
+            ServoExtensionCommand::GetPrefs(ref x) => Some(x.to_json()),
+            ServoExtensionCommand::SetPrefs(ref x) => Some(x.to_json()),
+            ServoExtensionCommand::ResetPrefs(ref x) => Some(x.to_json()),
         }
     }
 }
@@ -541,8 +541,8 @@ impl Handler {
             "implicit" => self.implicit_wait_timeout = value,
             "page load" => self.load_timeout = value,
             "script" => self.script_timeout = value,
-            x @ _ => return Err(WebDriverError::new(ErrorStatus::InvalidSelector,
-                                                    &format!("Unknown timeout type {}", x)))
+            x => return Err(WebDriverError::new(ErrorStatus::InvalidSelector,
+                                                &format!("Unknown timeout type {}", x)))
         }
         Ok(WebDriverResponse::Void)
     }
@@ -705,10 +705,10 @@ impl WebDriverHandler<ServoExtensionRoute> for Handler {
             WebDriverCommand::SetTimeouts(ref x) => self.handle_set_timeouts(x),
             WebDriverCommand::TakeScreenshot => self.handle_take_screenshot(),
             WebDriverCommand::Extension(ref extension) => {
-                match extension {
-                    &ServoExtensionCommand::GetPrefs(ref x) => self.handle_get_prefs(x),
-                    &ServoExtensionCommand::SetPrefs(ref x) => self.handle_set_prefs(x),
-                    &ServoExtensionCommand::ResetPrefs(ref x) => self.handle_reset_prefs(x),
+                match *extension {
+                    ServoExtensionCommand::GetPrefs(ref x) => self.handle_get_prefs(x),
+                    ServoExtensionCommand::SetPrefs(ref x) => self.handle_set_prefs(x),
+                    ServoExtensionCommand::ResetPrefs(ref x) => self.handle_reset_prefs(x),
                 }
             }
             _ => Err(WebDriverError::new(ErrorStatus::UnsupportedOperation,