diff --git a/components/style/servo/selector_parser.rs b/components/style/servo/selector_parser.rs
index 434e7a3082e..248efcba7de 100644
--- a/components/style/servo/selector_parser.rs
+++ b/components/style/servo/selector_parser.rs
@@ -616,53 +616,48 @@ impl<E: Element<Impl=SelectorImpl> + Debug> ElementExt for E {
 /// Returns whether the language is matched, as defined by
 /// [RFC 4647](https://tools.ietf.org/html/rfc4647#section-3.3.2).
 pub fn extended_filtering(tag: &str, range: &str) -> bool {
-    let lang_ranges: Vec<&str> = range.split(',').collect();
-
-    lang_ranges.iter().any(|&lang_range| {
+    range.split(',').any(|lang_range| {
         // step 1
-        let range_subtags: Vec<&str> = lang_range.split('\x2d').collect();
-        let tag_subtags: Vec<&str> = tag.split('\x2d').collect();
-
-        let mut range_iter = range_subtags.iter();
-        let mut tag_iter = tag_subtags.iter();
+        let mut range_subtags = lang_range.split('\x2d');
+        let mut tag_subtags = tag.split('\x2d');
 
         // step 2
         // Note: [Level-4 spec](https://drafts.csswg.org/selectors/#lang-pseudo) check for wild card
-        if let (Some(range_subtag), Some(tag_subtag)) = (range_iter.next(), tag_iter.next()) {
+        if let (Some(range_subtag), Some(tag_subtag)) = (range_subtags.next(), tag_subtags.next()) {
             if !(range_subtag.eq_ignore_ascii_case(tag_subtag) || range_subtag.eq_ignore_ascii_case("*")) {
                 return false;
             }
         }
 
-        let mut current_tag_subtag = tag_iter.next();
+        let mut current_tag_subtag = tag_subtags.next();
 
         // step 3
-        for range_subtag in range_iter {
+        for range_subtag in range_subtags {
             // step 3a
-            if range_subtag.eq_ignore_ascii_case("*") {
+            if range_subtag == "*" {
                 continue;
             }
             match current_tag_subtag.clone() {
                 Some(tag_subtag) => {
                     // step 3c
                     if range_subtag.eq_ignore_ascii_case(tag_subtag) {
-                        current_tag_subtag = tag_iter.next();
+                        current_tag_subtag = tag_subtags.next();
                         continue;
-                    } else {
-                        // step 3d
-                        if tag_subtag.len() == 1 {
-                            return false;
-                        } else {
-                            // else step 3e - continue with loop
-                            current_tag_subtag = tag_iter.next();
-                            if current_tag_subtag.is_none() {
-                                return false;
-                            }
-                        }
+                    }
+                    // step 3d
+                    if tag_subtag.len() == 1 {
+                        return false;
+                    }
+                    // else step 3e - continue with loop
+                    current_tag_subtag = tag_subtags.next();
+                    if current_tag_subtag.is_none() {
+                        return false;
                     }
                 },
                 // step 3b
-                None => { return false; }
+                None => {
+                    return false;
+                }
             }
         }
         // step 4