diff --git a/ast.rs b/ast.rs
index 8f82a5f4..b180a296 100644
--- a/ast.rs
+++ b/ast.rs
@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use std::fmt;
-use std::vec;
+use std::slice;
 
 
 #[deriving(Eq)]
@@ -139,7 +139,7 @@ impl<'a> SkipWhitespaceIterable<'a> for &'a [ComponentValue] {
 
 #[deriving(Clone)]
 pub struct SkipWhitespaceIterator<'a> {
-    iter_with_whitespace: vec::Items<'a, ComponentValue>,
+    iter_with_whitespace: slice::Items<'a, ComponentValue>,
 }
 
 impl<'a> Iterator<&'a ComponentValue> for SkipWhitespaceIterator<'a> {
@@ -163,7 +163,7 @@ impl MoveSkipWhitespaceIterable for ~[ComponentValue] {
 }
 
 pub struct MoveSkipWhitespaceIterator {
-    iter_with_whitespace: vec::MoveItems<ComponentValue>,
+    iter_with_whitespace: slice::MoveItems<ComponentValue>,
 }
 
 impl Iterator<ComponentValue> for MoveSkipWhitespaceIterator {
diff --git a/color.rs b/color.rs
index b79160a7..7338a6ac 100644
--- a/color.rs
+++ b/color.rs
@@ -3,7 +3,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use std::ascii::StrAsciiExt;
-use std::cmp;
 
 use ast::*;
 
@@ -298,9 +297,9 @@ fn parse_color_function(name: &str, arguments: &[ComponentValue])
         let hue = expect_number!() / 360.;
         let hue = hue - hue.floor();
         expect_comma!();
-        let saturation = cmp::min(cmp::max((expect_percentage!() / 100.), 0.), 1.);
+        let saturation = (expect_percentage!() / 100.).min(0.).max(1.);
         expect_comma!();
-        let lightness = cmp::min(cmp::max((expect_percentage!() / 100.), 0.), 1.);
+        let lightness = (expect_percentage!() / 100.).min(0.).max(1.);
 
         // http://www.w3.org/TR/css3-color/#hsl-color
         fn hue_to_rgb(m1: f64, m2: f64, mut h: f64) -> f64 {
@@ -322,7 +321,7 @@ fn parse_color_function(name: &str, arguments: &[ComponentValue])
 
     let alpha = if has_alpha {
         expect_comma!();
-        cmp::min(cmp::max((expect_number!()), 0.), 1.) as f32
+        (expect_number!()).min(0.).max(1.) as f32
     } else {
         1.
     };
diff --git a/lib.rs b/lib.rs
index 0bcb783f..157b66b8 100644
--- a/lib.rs
+++ b/lib.rs
@@ -5,7 +5,6 @@
 #[crate_id = "github.com/mozilla-servo/rust-cssparser#cssparser:0.1"];
 #[feature(globs, macro_rules)];
 
-extern crate extra;
 extern crate encoding;  // https://github.com/lifthrasiir/rust-encoding
 
 #[cfg(test)]