Fixes to pass tidy.

components/selectors/matching.rs

@@ -1,12 +1,10 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-use std::borrow::Borrow;
-
 use bloom::BloomFilter;
-
 use parser::{CaseSensitivity, Combinator, ComplexSelector, LocalName};
 use parser::{SimpleSelector, Selector, SelectorImpl};
+use std::borrow::Borrow;
 use tree::Element;
 
 /// The reason why we're doing selector matching.
@@ -240,8 +238,8 @@ fn can_fast_reject<E>(mut selector: &ComplexSelector<E::Impl>,
         for ss in selector.compound_selector.iter() {
             match *ss {
                 SimpleSelector::LocalName(LocalName { ref name, ref lower_name })  => {
-                    if !bf.might_contain(name)
-                    && !bf.might_contain(lower_name) {
+                    if !bf.might_contain(name) &&
+                       !bf.might_contain(lower_name) {
                         return Some(SelectorMatchingResult::NotMatchedGlobally);
                     }
                 },
@@ -320,7 +318,8 @@ fn matches_complex_selector_internal<E>(selector: &ComplexSelector<E::Impl>,
                     // If the failure status is NotMatchedAndRestartFromClosestDescendant
                     // and combinator is Combinator::LaterSibling, give up this Combinator::LaterSibling matching
                     // and restart from the closest descendant combinator.
-                    (SelectorMatchingResult::NotMatchedAndRestartFromClosestDescendant, Combinator::LaterSibling) => return result,
+                    (SelectorMatchingResult::NotMatchedAndRestartFromClosestDescendant, Combinator::LaterSibling)
+                        => return result,
 
                     // The Combinator::Descendant combinator and the status is
                     // NotMatchedAndRestartFromClosestLaterSibling or
@@ -436,7 +435,8 @@ fn matches_simple_selector<E>(
             relation_if!(matches_last_child(element, reason), AFFECTED_BY_CHILD_INDEX)
         }
         SimpleSelector::OnlyChild => {
-            relation_if!(matches_first_child(element, reason) && matches_last_child(element, reason), AFFECTED_BY_CHILD_INDEX)
+            relation_if!(matches_first_child(element, reason) &&
+                         matches_last_child(element, reason), AFFECTED_BY_CHILD_INDEX)
         }
         SimpleSelector::Root => {
             // We never share styles with an element with no parent, so no point

components/selectors/parser.rs

@@ -574,7 +574,7 @@ impl From<Specificity> for u32 {
 fn specificity<Impl>(complex_selector: &ComplexSelector<Impl>,
                      pseudo_element: Option<&Impl::PseudoElement>)
                      -> u32
-				     where Impl: SelectorImpl {
+                     where Impl: SelectorImpl {
     let mut specificity = complex_selector_specificity(complex_selector);
     if pseudo_element.is_some() {
         specificity.element_selectors += 1;
@@ -670,7 +670,7 @@ fn parse_complex_selector_and_pseudo_element<P, Impl>(
     where P: Parser<Impl=Impl>, Impl: SelectorImpl
 {
     let (first, mut pseudo_element) = parse_compound_selector(parser, input)?;
-    let mut complex = ComplexSelector{ compound_selector: first, next: None };
+    let mut complex = ComplexSelector { compound_selector: first, next: None };
 
     'outer_loop: while pseudo_element.is_none() {
         let combinator;
@@ -1123,11 +1123,11 @@ fn parse_simple_pseudo_class<P, Impl>(parser: &P, name: Cow<str>) -> Result<Simp
 // NB: pub module in order to access the DummyParser
 #[cfg(test)]
 pub mod tests {
+    use cssparser::{Parser as CssParser, ToCss, serialize_identifier};
     use std::borrow::Cow;
     use std::collections::HashMap;
     use std::fmt;
     use std::sync::Arc;
-    use cssparser::{Parser as CssParser, ToCss, serialize_identifier};
     use super::*;
 
     #[derive(PartialEq, Clone, Debug, Hash, Eq)]
@@ -1219,7 +1219,7 @@ pub mod tests {
             self.default_ns.clone()
         }
 
-        fn namespace_for_prefix(&self, prefix: &String) -> Option<String> {
+        fn namespace_for_prefix(&self, prefix: &str) -> Option<String> {
             self.ns_prefixes.get(prefix).cloned()
         }
     }

components/selectors/tree.rs

@@ -86,7 +86,6 @@ impl<T> MatchAttr for T where T: MatchAttrGeneric, T::Impl: SelectorImpl<AttrVal
 
     fn match_attr_dash(&self, attr: &AttrSelector<Self::Impl>, value: &String) -> bool {
         self.match_attr(attr, |attr_value| {
-
             // The attribute must start with the pattern.
             if !attr_value.starts_with(value) {
                 return false

servo-tidy.toml

@@ -50,6 +50,9 @@ files = [
   "./tests/wpt/mozilla/tests/css/fonts",
   "./tests/wpt/mozilla/tests/css/pre_with_tab.html",
   "./tests/wpt/mozilla/tests/mozilla/textarea_placeholder.html",
+  # Tidy complains about taking &String instead of &str, but they aren't
+  # equivalent given the way the traits are set up.
+  "./components/selectors/tree.rs",
 ]
 # Directories that are ignored for the non-WPT tidy check.
 directories = [