diff -r c78880e58206 -r 8ccb9c3cbe47 mozilla-rust-1.23.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mozilla-rust-1.23.patch	Wed Jan 10 22:19:23 2018 +0100
@@ -0,0 +1,1083 @@
+
+# HG changeset patch
+# User Simon Sapin <simon.sapin@exyr.org>
+# Date 1510231769 21600
+# Node ID 3242ac6fdb3879f723145e6b07fff04a5c960d1e
+# Parent  bf63b9d8f2410464d5f2526588e380f934e937cc
+servo: Merge #19162 - Allow unused imports for AsciiExt in style code (from emilio:ascii-ext); r=emilio
+
+See #19128, this part is cherry-picked so Gecko can build with rust nightly.
+
+Source-Repo: https://github.com/servo/servo
+Source-Revision: e7a654dd13f589e127193267bcb576ffd661c11d
+
+diff --git a/servo/components/gfx/font.rs b/servo/components/gfx/font.rs
+--- a/servo/components/gfx/font.rs
++++ b/servo/components/gfx/font.rs
+@@ -5,17 +5,17 @@
+ use app_units::Au;
+ use euclid::{Point2D, Rect, Size2D};
+ use font_template::FontTemplateDescriptor;
+ use ordered_float::NotNaN;
+ use platform::font::{FontHandle, FontTable};
+ use platform::font_context::FontContextHandle;
+ use platform::font_template::FontTemplateData;
+ use smallvec::SmallVec;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::RefCell;
+ use std::collections::HashMap;
+ use std::rc::Rc;
+ use std::str;
+ use std::sync::Arc;
+ use std::sync::atomic::{ATOMIC_USIZE_INIT, AtomicUsize, Ordering};
+ use style::computed_values::{font_stretch, font_variant_caps, font_weight};
+diff --git a/servo/components/net/fetch/cors_cache.rs b/servo/components/net/fetch/cors_cache.rs
+--- a/servo/components/net/fetch/cors_cache.rs
++++ b/servo/components/net/fetch/cors_cache.rs
+@@ -7,17 +7,17 @@
+ //! For stuff involving `<img>`, `<iframe>`, `<form>`, etc please check what
+ //! the request mode should be and compare with the fetch spec
+ //! This library will eventually become the core of the Fetch crate
+ //! with CORSRequest being expanded into FetchRequest (etc)
+ 
+ use hyper::method::Method;
+ use net_traits::request::{CredentialsMode, Origin, Request};
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use time::{self, Timespec};
+ 
+ /// Union type for CORS cache entries
+ ///
+ /// Each entry might pertain to a header or method
+ #[derive(Clone, Debug)]
+ pub enum HeaderOrMethod {
+     HeaderData(String),
+diff --git a/servo/components/net/fetch/methods.rs b/servo/components/net/fetch/methods.rs
+--- a/servo/components/net/fetch/methods.rs
++++ b/servo/components/net/fetch/methods.rs
+@@ -16,17 +16,17 @@ use hyper::method::Method;
+ use hyper::mime::{Mime, SubLevel, TopLevel};
+ use hyper::status::StatusCode;
+ use mime_guess::guess_mime_type;
+ use net_traits::{FetchTaskTarget, NetworkError, ReferrerPolicy};
+ use net_traits::request::{CredentialsMode, Referrer, Request, RequestMode, ResponseTainting};
+ use net_traits::request::{Type, Origin, Window};
+ use net_traits::response::{Response, ResponseBody, ResponseType};
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::fmt;
+ use std::fs::File;
+ use std::io::Read;
+ use std::mem;
+ use std::str;
+ use std::sync::Arc;
+ use std::sync::mpsc::{Sender, Receiver};
+diff --git a/servo/components/net/http_loader.rs b/servo/components/net/http_loader.rs
+--- a/servo/components/net/http_loader.rs
++++ b/servo/components/net/http_loader.rs
+@@ -34,17 +34,17 @@ use log;
+ use msg::constellation_msg::PipelineId;
+ use net_traits::{CookieSource, FetchMetadata, NetworkError, ReferrerPolicy};
+ use net_traits::request::{CacheMode, CredentialsMode, Destination, Origin};
+ use net_traits::request::{RedirectMode, Referrer, Request, RequestMode};
+ use net_traits::request::{ResponseTainting, ServiceWorkersMode, Type};
+ use net_traits::response::{HttpsState, Response, ResponseBody, ResponseType};
+ use resource_thread::AuthCache;
+ use servo_url::{ImmutableOrigin, ServoUrl};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::collections::HashSet;
+ use std::error::Error;
+ use std::io::{self, Read, Write};
+ use std::iter::FromIterator;
+ use std::mem;
+ use std::ops::Deref;
+ use std::sync::RwLock;
+ use std::sync::mpsc::{channel, Sender};
+diff --git a/servo/components/net/websocket_loader.rs b/servo/components/net/websocket_loader.rs
+--- a/servo/components/net/websocket_loader.rs
++++ b/servo/components/net/websocket_loader.rs
+@@ -14,17 +14,17 @@ use hyper::http::h1::{LINE_ENDING, parse
+ use hyper::method::Method;
+ use hyper::net::HttpStream;
+ use hyper::status::StatusCode;
+ use hyper::version::HttpVersion;
+ use net_traits::{CookieSource, MessageData, NetworkError, WebSocketCommunicate, WebSocketConnectData};
+ use net_traits::{WebSocketDomAction, WebSocketNetworkEvent};
+ use net_traits::request::{Destination, Type};
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::io::{self, Write};
+ use std::net::TcpStream;
+ use std::sync::{Arc, Mutex};
+ use std::sync::atomic::{AtomicBool, Ordering};
+ use std::thread;
+ use url::Position;
+ use websocket::{Message, Receiver as WSReceiver, Sender as WSSender};
+ use websocket::header::{Origin, WebSocketAccept, WebSocketKey, WebSocketProtocol, WebSocketVersion};
+diff --git a/servo/components/net_traits/response.rs b/servo/components/net_traits/response.rs
+--- a/servo/components/net_traits/response.rs
++++ b/servo/components/net_traits/response.rs
+@@ -4,17 +4,17 @@
+ 
+ //! The [Response](https://fetch.spec.whatwg.org/#responses) object
+ //! resulting from a [fetch operation](https://fetch.spec.whatwg.org/#concept-fetch)
+ use {FetchMetadata, FilteredMetadata, Metadata, NetworkError, ReferrerPolicy};
+ use hyper::header::{AccessControlExposeHeaders, ContentType, Headers};
+ use hyper::status::StatusCode;
+ use hyper_serde::Serde;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::sync::{Arc, Mutex};
+ 
+ /// [Response type](https://fetch.spec.whatwg.org/#concept-response-type)
+ #[derive(Clone, Debug, Deserialize, HeapSizeOf, PartialEq, Serialize)]
+ pub enum ResponseType {
+     Basic,
+     Cors,
+     Default,
+diff --git a/servo/components/script/dom/bindings/str.rs b/servo/components/script/dom/bindings/str.rs
+--- a/servo/components/script/dom/bindings/str.rs
++++ b/servo/components/script/dom/bindings/str.rs
+@@ -2,17 +2,17 @@
+  * 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/. */
+ 
+ //! The `ByteString` struct.
+ 
+ use cssparser::CowRcStr;
+ use html5ever::{LocalName, Namespace};
+ use servo_atoms::Atom;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::{Borrow, Cow, ToOwned};
+ use std::fmt;
+ use std::hash::{Hash, Hasher};
+ use std::marker::PhantomData;
+ use std::ops;
+ use std::ops::{Deref, DerefMut};
+ use std::str;
+ use std::str::{Bytes, FromStr};
+diff --git a/servo/components/script/dom/blob.rs b/servo/components/script/dom/blob.rs
+--- a/servo/components/script/dom/blob.rs
++++ b/servo/components/script/dom/blob.rs
+@@ -11,17 +11,17 @@ use dom::bindings::js::{JS, Root};
+ use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
+ use dom::bindings::str::DOMString;
+ use dom::globalscope::GlobalScope;
+ use dom_struct::dom_struct;
+ use ipc_channel::ipc;
+ use net_traits::{CoreResourceMsg, IpcSend};
+ use net_traits::blob_url_store::{BlobBuf, get_blob_origin};
+ use net_traits::filemanager_thread::{FileManagerThreadMsg, ReadFileProgress, RelativePos};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::mem;
+ use std::ops::Index;
+ use std::path::PathBuf;
+ use uuid::Uuid;
+ 
+ /// File-based blob
+ #[derive(JSTraceable)]
+ pub struct FileBlob {
+diff --git a/servo/components/script/dom/cssstyledeclaration.rs b/servo/components/script/dom/cssstyledeclaration.rs
+--- a/servo/components/script/dom/cssstyledeclaration.rs
++++ b/servo/components/script/dom/cssstyledeclaration.rs
+@@ -11,17 +11,17 @@ use dom::bindings::reflector::{DomObject
+ use dom::bindings::str::DOMString;
+ use dom::cssrule::CSSRule;
+ use dom::element::Element;
+ use dom::node::{Node, window_from_node, document_from_node};
+ use dom::window::Window;
+ use dom_struct::dom_struct;
+ use servo_arc::Arc;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use style::attr::AttrValue;
+ use style::properties::{Importance, PropertyDeclarationBlock, PropertyId, LonghandId, ShorthandId};
+ use style::properties::{parse_one_declaration_into, parse_style_attribute, SourcePropertyDeclaration};
+ use style::selector_parser::PseudoElement;
+ use style::shared_lock::Locked;
+ use style_traits::{PARSING_MODE_DEFAULT, ToCss};
+ 
+ // http://dev.w3.org/csswg/cssom/#the-cssstyledeclaration-interface
+diff --git a/servo/components/script/dom/document.rs b/servo/components/script/dom/document.rs
+--- a/servo/components/script/dom/document.rs
++++ b/servo/components/script/dom/document.rs
+@@ -118,17 +118,17 @@ use script_traits::{AnimationState, Comp
+ use script_traits::{MouseButton, MouseEventType, MozBrowserEvent};
+ use script_traits::{MsDuration, ScriptMsg, TouchpadPressurePhase};
+ use script_traits::{TouchEventType, TouchId};
+ use script_traits::UntrustedNodeAddress;
+ use servo_arc::Arc;
+ use servo_atoms::Atom;
+ use servo_config::prefs::PREFS;
+ use servo_url::{ImmutableOrigin, MutableOrigin, ServoUrl};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::{Cell, Ref, RefMut};
+ use std::collections::{HashMap, HashSet, VecDeque};
+ use std::collections::hash_map::Entry::{Occupied, Vacant};
+ use std::default::Default;
+ use std::iter::once;
+ use std::mem;
+ use std::rc::Rc;
+diff --git a/servo/components/script/dom/element.rs b/servo/components/script/dom/element.rs
+--- a/servo/components/script/dom/element.rs
++++ b/servo/components/script/dom/element.rs
+@@ -90,17 +90,17 @@ use script_layout_interface::message::Re
+ use script_thread::ScriptThread;
+ use selectors::attr::{AttrSelectorOperation, NamespaceConstraint, CaseSensitivity};
+ use selectors::matching::{ElementSelectorFlags, LocalMatchingContext, MatchingContext, MatchingMode};
+ use selectors::matching::{HAS_EDGE_CHILD_SELECTOR, HAS_SLOW_SELECTOR, HAS_SLOW_SELECTOR_LATER_SIBLINGS};
+ use selectors::matching::{RelevantLinkStatus, matches_selector_list};
+ use selectors::sink::Push;
+ use servo_arc::Arc;
+ use servo_atoms::Atom;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::cell::{Cell, Ref};
+ use std::convert::TryFrom;
+ use std::default::Default;
+ use std::fmt;
+ use std::mem;
+ use std::rc::Rc;
+ use style::CaseSensitivityExt;
+diff --git a/servo/components/script/dom/htmlelement.rs b/servo/components/script/dom/htmlelement.rs
+--- a/servo/components/script/dom/htmlelement.rs
++++ b/servo/components/script/dom/htmlelement.rs
+@@ -25,17 +25,17 @@ use dom::htmlhtmlelement::HTMLHtmlElemen
+ use dom::htmlinputelement::HTMLInputElement;
+ use dom::htmllabelelement::HTMLLabelElement;
+ use dom::node::{Node, SEQUENTIALLY_FOCUSABLE};
+ use dom::node::{document_from_node, window_from_node};
+ use dom::nodelist::NodeList;
+ use dom::virtualmethods::VirtualMethods;
+ use dom_struct::dom_struct;
+ use html5ever::{LocalName, Prefix};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::default::Default;
+ use std::rc::Rc;
+ use style::attr::AttrValue;
+ use style::element_state::*;
+ 
+ #[dom_struct]
+ pub struct HTMLElement {
+     element: Element,
+diff --git a/servo/components/script/dom/htmllinkelement.rs b/servo/components/script/dom/htmllinkelement.rs
+--- a/servo/components/script/dom/htmllinkelement.rs
++++ b/servo/components/script/dom/htmllinkelement.rs
+@@ -21,17 +21,17 @@ use dom::htmlelement::HTMLElement;
+ use dom::node::{Node, UnbindContext, document_from_node, window_from_node};
+ use dom::stylesheet::StyleSheet as DOMStyleSheet;
+ use dom::virtualmethods::VirtualMethods;
+ use dom_struct::dom_struct;
+ use html5ever::{LocalName, Prefix};
+ use net_traits::ReferrerPolicy;
+ use script_traits::{MozBrowserEvent, ScriptMsg};
+ use servo_arc::Arc;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::Cell;
+ use std::default::Default;
+ use style::attr::AttrValue;
+ use style::media_queries::parse_media_query_list;
+ use style::parser::ParserContext as CssParserContext;
+ use style::str::HTML_SPACE_CHARACTERS;
+ use style::stylesheets::{CssRuleType, Stylesheet};
+diff --git a/servo/components/script/dom/htmlmetaelement.rs b/servo/components/script/dom/htmlmetaelement.rs
+--- a/servo/components/script/dom/htmlmetaelement.rs
++++ b/servo/components/script/dom/htmlmetaelement.rs
+@@ -17,17 +17,17 @@ use dom::htmlelement::HTMLElement;
+ use dom::htmlheadelement::HTMLHeadElement;
+ use dom::node::{Node, UnbindContext, document_from_node, window_from_node};
+ use dom::virtualmethods::VirtualMethods;
+ use dom_struct::dom_struct;
+ use html5ever::{LocalName, Prefix};
+ use parking_lot::RwLock;
+ use servo_arc::Arc;
+ use servo_config::prefs::PREFS;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::sync::atomic::AtomicBool;
+ use style::attr::AttrValue;
+ use style::media_queries::MediaList;
+ use style::str::HTML_SPACE_CHARACTERS;
+ use style::stylesheets::{Stylesheet, StylesheetContents, CssRule, CssRules, Origin, ViewportRule};
+ 
+ #[dom_struct]
+ pub struct HTMLMetaElement {
+diff --git a/servo/components/script/dom/htmlscriptelement.rs b/servo/components/script/dom/htmlscriptelement.rs
+--- a/servo/components/script/dom/htmlscriptelement.rs
++++ b/servo/components/script/dom/htmlscriptelement.rs
+@@ -31,17 +31,17 @@ use ipc_channel::ipc;
+ use ipc_channel::router::ROUTER;
+ use js::jsval::UndefinedValue;
+ use net_traits::{FetchMetadata, FetchResponseListener, Metadata, NetworkError};
+ use net_traits::request::{CorsSettings, CredentialsMode, Destination, RequestInit, RequestMode, Type as RequestType};
+ use network_listener::{NetworkListener, PreInvoke};
+ use servo_atoms::Atom;
+ use servo_config::opts;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::cell::Cell;
+ use std::fs::File;
+ use std::io::{Read, Write};
+ use std::path::PathBuf;
+ use std::process::{Command, Stdio};
+ use std::sync::{Arc, Mutex};
+ use style::str::{HTML_SPACE_CHARACTERS, StaticStringVec};
+ use uuid::Uuid;
+diff --git a/servo/components/script/dom/macros.rs b/servo/components/script/dom/macros.rs
+--- a/servo/components/script/dom/macros.rs
++++ b/servo/components/script/dom/macros.rs
+@@ -144,17 +144,17 @@ macro_rules! make_string_or_document_url
+ );
+ 
+ #[macro_export]
+ macro_rules! make_enumerated_getter(
+     ( $attr:ident, $htmlname:tt, $default:expr, $($choices: pat)|+) => (
+         fn $attr(&self) -> DOMString {
+             use dom::bindings::inheritance::Castable;
+             use dom::element::Element;
+-            use std::ascii::AsciiExt;
++            #[allow(unused_imports)] use std::ascii::AsciiExt;
+             let element = self.upcast::<Element>();
+             let mut val = element.get_string_attribute(&local_name!($htmlname));
+             val.make_ascii_lowercase();
+             // https://html.spec.whatwg.org/multipage/#attr-fs-method
+             match &*val {
+                 $($choices)|+ => val,
+                 _ => DOMString::from($default)
+             }
+diff --git a/servo/components/script/dom/namednodemap.rs b/servo/components/script/dom/namednodemap.rs
+--- a/servo/components/script/dom/namednodemap.rs
++++ b/servo/components/script/dom/namednodemap.rs
+@@ -10,17 +10,17 @@ use dom::bindings::error::{Error, Fallib
+ use dom::bindings::js::{JS, Root};
+ use dom::bindings::reflector::{Reflector, reflect_dom_object};
+ use dom::bindings::str::DOMString;
+ use dom::bindings::xmlname::namespace_from_domstring;
+ use dom::element::Element;
+ use dom::window::Window;
+ use dom_struct::dom_struct;
+ use html5ever::LocalName;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ 
+ #[dom_struct]
+ pub struct NamedNodeMap {
+     reflector_: Reflector,
+     owner: JS<Element>,
+ }
+ 
+ impl NamedNodeMap {
+diff --git a/servo/components/script/dom/serviceworkercontainer.rs b/servo/components/script/dom/serviceworkercontainer.rs
+--- a/servo/components/script/dom/serviceworkercontainer.rs
++++ b/servo/components/script/dom/serviceworkercontainer.rs
+@@ -11,17 +11,17 @@ use dom::bindings::str::USVString;
+ use dom::client::Client;
+ use dom::eventtarget::EventTarget;
+ use dom::globalscope::GlobalScope;
+ use dom::promise::Promise;
+ use dom::serviceworker::ServiceWorker;
+ use dom_struct::dom_struct;
+ use script_thread::ScriptThread;
+ use serviceworkerjob::{Job, JobType};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::default::Default;
+ use std::rc::Rc;
+ 
+ #[dom_struct]
+ pub struct ServiceWorkerContainer {
+     eventtarget: EventTarget,
+     controller: MutNullableJS<ServiceWorker>,
+     client: JS<Client>
+diff --git a/servo/components/script/dom/servoparser/async_html.rs b/servo/components/script/dom/servoparser/async_html.rs
+--- a/servo/components/script/dom/servoparser/async_html.rs
++++ b/servo/components/script/dom/servoparser/async_html.rs
+@@ -22,17 +22,17 @@ use dom::virtualmethods::vtable_for;
+ use html5ever::{Attribute as HtmlAttribute, ExpandedName, LocalName, QualName};
+ use html5ever::buffer_queue::BufferQueue;
+ use html5ever::tendril::{SendTendril, StrTendril, Tendril};
+ use html5ever::tendril::fmt::UTF8;
+ use html5ever::tokenizer::{Tokenizer as HtmlTokenizer, TokenizerOpts, TokenizerResult};
+ use html5ever::tree_builder::{ElementFlags, NodeOrText as HtmlNodeOrText, NextParserState, QuirksMode, TreeSink};
+ use html5ever::tree_builder::{TreeBuilder, TreeBuilderOpts};
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::cell::Cell;
+ use std::collections::HashMap;
+ use std::collections::vec_deque::VecDeque;
+ use std::sync::mpsc::{channel, Receiver, Sender};
+ use std::thread;
+ use style::context::QuirksMode as ServoQuirksMode;
+ 
+diff --git a/servo/components/script/dom/servoparser/mod.rs b/servo/components/script/dom/servoparser/mod.rs
+--- a/servo/components/script/dom/servoparser/mod.rs
++++ b/servo/components/script/dom/servoparser/mod.rs
+@@ -41,17 +41,17 @@ use net_traits::{FetchMetadata, FetchRes
+ use network_listener::PreInvoke;
+ use profile_traits::time::{TimerMetadata, TimerMetadataFrameType};
+ use profile_traits::time::{TimerMetadataReflowType, ProfilerCategory, profile};
+ use script_thread::ScriptThread;
+ use script_traits::DocumentActivity;
+ use servo_config::prefs::PREFS;
+ use servo_config::resource_files::read_resource_file;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::cell::Cell;
+ use std::mem;
+ use style::context::QuirksMode as ServoQuirksMode;
+ 
+ mod async_html;
+ mod html;
+ mod xml;
+diff --git a/servo/components/script/dom/websocket.rs b/servo/components/script/dom/websocket.rs
+--- a/servo/components/script/dom/websocket.rs
++++ b/servo/components/script/dom/websocket.rs
+@@ -27,17 +27,17 @@ use js::jsapi::JSAutoCompartment;
+ use js::jsval::UndefinedValue;
+ use js::typedarray::{ArrayBuffer, CreateWith};
+ use net_traits::{WebSocketCommunicate, WebSocketConnectData, WebSocketDomAction, WebSocketNetworkEvent};
+ use net_traits::CoreResourceMsg::WebsocketConnect;
+ use net_traits::MessageData;
+ use script_runtime::CommonScriptMsg;
+ use script_runtime::ScriptThreadEventCategory::WebSocketEvent;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::Cell;
+ use std::ptr;
+ use std::thread;
+ use task::{TaskOnce, TaskCanceller};
+ use task_source::TaskSource;
+ use task_source::networking::NetworkingTaskSource;
+ 
+diff --git a/servo/components/script/dom/window.rs b/servo/components/script/dom/window.rs
+--- a/servo/components/script/dom/window.rs
++++ b/servo/components/script/dom/window.rs
+@@ -82,17 +82,17 @@ use script_traits::{ConstellationControl
+ use script_traits::{ScriptToConstellationChan, ScriptMsg, ScrollState, TimerEvent, TimerEventId};
+ use script_traits::{TimerSchedulerMsg, UntrustedNodeAddress, WindowSizeData, WindowSizeType};
+ use script_traits::webdriver_msg::{WebDriverJSError, WebDriverJSResult};
+ use selectors::attr::CaseSensitivity;
+ use servo_config::opts;
+ use servo_config::prefs::PREFS;
+ use servo_geometry::{f32_rect_to_au_rect, max_rect};
+ use servo_url::{Host, MutableOrigin, ImmutableOrigin, ServoUrl};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::Cell;
+ use std::collections::{HashMap, HashSet};
+ use std::collections::hash_map::Entry;
+ use std::default::Default;
+ use std::env;
+ use std::fs;
+ use std::io::{Write, stderr, stdout};
+diff --git a/servo/components/script/dom/xmlhttprequest.rs b/servo/components/script/dom/xmlhttprequest.rs
+--- a/servo/components/script/dom/xmlhttprequest.rs
++++ b/servo/components/script/dom/xmlhttprequest.rs
+@@ -57,17 +57,17 @@ use net_traits::{FetchResponseListener, 
+ use net_traits::CoreResourceMsg::Fetch;
+ use net_traits::request::{CredentialsMode, Destination, RequestInit, RequestMode};
+ use net_traits::trim_http_whitespace;
+ use network_listener::{NetworkListener, PreInvoke};
+ use script_traits::DocumentActivity;
+ use servo_atoms::Atom;
+ use servo_config::prefs::PREFS;
+ use servo_url::ServoUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::ToOwned;
+ use std::cell::Cell;
+ use std::default::Default;
+ use std::str;
+ use std::sync::{Arc, Mutex};
+ use task_source::networking::NetworkingTaskSource;
+ use time;
+ use timers::{OneshotTimerCallback, OneshotTimerHandle};
+diff --git a/servo/components/selectors/attr.rs b/servo/components/selectors/attr.rs
+--- a/servo/components/selectors/attr.rs
++++ b/servo/components/selectors/attr.rs
+@@ -1,15 +1,15 @@
+ /* 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 cssparser::ToCss;
+ use parser::SelectorImpl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ 
+ #[derive(Clone, Eq, PartialEq)]
+ pub struct AttrSelectorWithNamespace<Impl: SelectorImpl> {
+     pub namespace: NamespaceConstraint<(Impl::NamespacePrefix, Impl::NamespaceUrl)>,
+     pub local_name: Impl::LocalName,
+     pub local_name_lower: Impl::LocalName,
+     pub operation: ParsedAttrSelectorOperation<Impl::AttrValue>,
+diff --git a/servo/components/selectors/parser.rs b/servo/components/selectors/parser.rs
+--- a/servo/components/selectors/parser.rs
++++ b/servo/components/selectors/parser.rs
+@@ -8,17 +8,17 @@ use bloom::BLOOM_HASH_MASK;
+ use builder::{SelectorBuilder, SpecificityAndFlags};
+ use context::QuirksMode;
+ use cssparser::{ParseError, BasicParseError, CowRcStr, Delimiter};
+ use cssparser::{Token, Parser as CssParser, parse_nth, ToCss, serialize_identifier, CssStringWriter};
+ use precomputed_hash::PrecomputedHash;
+ use servo_arc::ThinArc;
+ use sink::Push;
+ use smallvec::SmallVec;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::{Borrow, Cow};
+ use std::fmt::{self, Display, Debug, Write};
+ use std::iter::Rev;
+ use std::slice;
+ use visitor::SelectorVisitor;
+ 
+ /// A trait that represents a pseudo-element.
+ pub trait PseudoElement : Sized + ToCss {
+diff --git a/servo/components/style/attr.rs b/servo/components/style/attr.rs
+--- a/servo/components/style/attr.rs
++++ b/servo/components/style/attr.rs
+@@ -11,17 +11,17 @@ use app_units::Au;
+ use cssparser::{self, Color, RGBA};
+ use euclid::num::Zero;
+ use num_traits::ToPrimitive;
+ use properties::PropertyDeclarationBlock;
+ use selectors::attr::AttrSelectorOperation;
+ use servo_arc::Arc;
+ use servo_url::ServoUrl;
+ use shared_lock::Locked;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::str::FromStr;
+ use str::{HTML_SPACE_CHARACTERS, read_exponent, read_fraction};
+ use str::{read_numbers, split_commas, split_html_space_chars};
+ use str::str_join;
+ use values::specified::Length;
+ 
+ // Duplicated from script::dom::values.
+ const UNSIGNED_LONG_MAX: u32 = 2147483647;
+diff --git a/servo/components/style/counter_style/mod.rs b/servo/components/style/counter_style/mod.rs
+--- a/servo/components/style/counter_style/mod.rs
++++ b/servo/components/style/counter_style/mod.rs
+@@ -10,17 +10,17 @@ use Atom;
+ use cssparser::{AtRuleParser, DeclarationListParser, DeclarationParser};
+ use cssparser::{Parser, Token, serialize_identifier, BasicParseError, CowRcStr};
+ use error_reporting::{ContextualParseError, ParseErrorReporter};
+ #[cfg(feature = "gecko")] use gecko::rules::CounterStyleDescriptors;
+ #[cfg(feature = "gecko")] use gecko_bindings::structs::nsCSSCounterDesc;
+ use parser::{ParserContext, ParserErrorContext, Parse};
+ use selectors::parser::SelectorParseError;
+ use shared_lock::{SharedRwLockReadGuard, ToCssWithGuard};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::fmt;
+ use std::ops::Range;
+ use style_traits::{Comma, OneOrMoreSeparated, ParseError, StyleParseError, ToCss};
+ use values::CustomIdent;
+ 
+ /// Parse the prelude of an @counter-style rule
+ pub fn parse_counter_style_name<'i, 't>(input: &mut Parser<'i, 't>) -> Result<CustomIdent, ParseError<'i>> {
+diff --git a/servo/components/style/custom_properties.rs b/servo/components/style/custom_properties.rs
+--- a/servo/components/style/custom_properties.rs
++++ b/servo/components/style/custom_properties.rs
+@@ -9,17 +9,17 @@
+ use Atom;
+ use cssparser::{Delimiter, Parser, ParserInput, SourcePosition, Token, TokenSerializationType};
+ use parser::ParserContext;
+ use precomputed_hash::PrecomputedHash;
+ use properties::{CSSWideKeyword, DeclaredValue};
+ use selector_map::{PrecomputedHashSet, PrecomputedHashMap};
+ use selectors::parser::SelectorParseError;
+ use servo_arc::Arc;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::{Borrow, Cow};
+ use std::fmt;
+ use std::hash::Hash;
+ use style_traits::{ToCss, StyleParseError, ParseError};
+ 
+ /// A custom property name is just an `Atom`.
+ ///
+ /// Note that this does not include the `--` prefix
+diff --git a/servo/components/style/gecko/generated/pseudo_element_definition.rs b/servo/components/style/gecko/generated/pseudo_element_definition.rs
+--- a/servo/components/style/gecko/generated/pseudo_element_definition.rs
++++ b/servo/components/style/gecko/generated/pseudo_element_definition.rs
+@@ -1262,17 +1262,17 @@ None
+     /// user-agent stylesheet.
+     ///
+     /// If we're not in a user-agent stylesheet, we will never parse anonymous
+     /// box pseudo-elements.
+     ///
+     /// Returns `None` if the pseudo-element is not recognised.
+     #[inline]
+     pub fn from_slice(s: &str, in_ua_stylesheet: bool) -> Option<Self> {
+-        use std::ascii::AsciiExt;
++        #[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+ 
+         // We don't need to support tree pseudos because functional
+         // pseudo-elements needs arguments, and thus should be created
+         // via other methods.
+             if in_ua_stylesheet || PseudoElement::After.exposed_in_non_ua_sheets() {
+                 if s.eq_ignore_ascii_case("after") {
+                     return Some(PseudoElement::After);
+                 }
+@@ -1632,17 +1632,17 @@ None
+     }
+ 
+     /// Constructs a tree pseudo-element from the given name and arguments.
+     /// "name" must start with "-moz-tree-".
+     ///
+     /// Returns `None` if the pseudo-element is not recognized.
+     #[inline]
+     pub fn tree_pseudo_element(name: &str, args: Box<[String]>) -> Option<Self> {
+-        use std::ascii::AsciiExt;
++        #[allow(unused_imports)] use std::ascii::AsciiExt;
+         debug_assert!(name.starts_with("-moz-tree-"));
+         let tree_part = &name[10..];
+             if tree_part.eq_ignore_ascii_case("column") {
+                 return Some(PseudoElement::MozTreeColumn(args));
+             }
+             if tree_part.eq_ignore_ascii_case("row") {
+                 return Some(PseudoElement::MozTreeRow(args));
+             }
+diff --git a/servo/components/style/gecko/pseudo_element_definition.mako.rs b/servo/components/style/gecko/pseudo_element_definition.mako.rs
+--- a/servo/components/style/gecko/pseudo_element_definition.mako.rs
++++ b/servo/components/style/gecko/pseudo_element_definition.mako.rs
+@@ -181,17 +181,17 @@ impl PseudoElement {
+     /// user-agent stylesheet.
+     ///
+     /// If we're not in a user-agent stylesheet, we will never parse anonymous
+     /// box pseudo-elements.
+     ///
+     /// Returns `None` if the pseudo-element is not recognised.
+     #[inline]
+     pub fn from_slice(s: &str, in_ua_stylesheet: bool) -> Option<Self> {
+-        use std::ascii::AsciiExt;
++        #[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+ 
+         // We don't need to support tree pseudos because functional
+         // pseudo-elements needs arguments, and thus should be created
+         // via other methods.
+         % for pseudo in SIMPLE_PSEUDOS:
+             if in_ua_stylesheet || ${pseudo_element_variant(pseudo)}.exposed_in_non_ua_sheets() {
+                 if s.eq_ignore_ascii_case("${pseudo.value[1:]}") {
+                     return Some(${pseudo_element_variant(pseudo)});
+@@ -203,17 +203,17 @@ impl PseudoElement {
+     }
+ 
+     /// Constructs a tree pseudo-element from the given name and arguments.
+     /// "name" must start with "-moz-tree-".
+     ///
+     /// Returns `None` if the pseudo-element is not recognized.
+     #[inline]
+     pub fn tree_pseudo_element(name: &str, args: Box<[String]>) -> Option<Self> {
+-        use std::ascii::AsciiExt;
++        #[allow(unused_imports)] use std::ascii::AsciiExt;
+         debug_assert!(name.starts_with("-moz-tree-"));
+         let tree_part = &name[10..];
+         % for pseudo in TREE_PSEUDOS:
+             if tree_part.eq_ignore_ascii_case("${pseudo.value[11:]}") {
+                 return Some(${pseudo_element_variant(pseudo, "args")});
+             }
+         % endfor
+         None
+diff --git a/servo/components/style/gecko_string_cache/mod.rs b/servo/components/style/gecko_string_cache/mod.rs
+--- a/servo/components/style/gecko_string_cache/mod.rs
++++ b/servo/components/style/gecko_string_cache/mod.rs
+@@ -8,17 +8,17 @@
+ 
+ use gecko_bindings::bindings::Gecko_AddRefAtom;
+ use gecko_bindings::bindings::Gecko_Atomize;
+ use gecko_bindings::bindings::Gecko_Atomize16;
+ use gecko_bindings::bindings::Gecko_ReleaseAtom;
+ use gecko_bindings::structs::{nsIAtom, nsIAtom_AtomKind};
+ use nsstring::{nsAString, nsString};
+ use precomputed_hash::PrecomputedHash;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::{Cow, Borrow};
+ use std::char::{self, DecodeUtf16};
+ use std::fmt::{self, Write};
+ use std::hash::{Hash, Hasher};
+ use std::iter::Cloned;
+ use std::mem;
+ use std::ops::Deref;
+ use std::slice;
+diff --git a/servo/components/style/properties/longhand/font.mako.rs b/servo/components/style/properties/longhand/font.mako.rs
+--- a/servo/components/style/properties/longhand/font.mako.rs
++++ b/servo/components/style/properties/longhand/font.mako.rs
+@@ -2137,17 +2137,17 @@ https://drafts.csswg.org/css-fonts-4/#lo
+         SpecifiedValue::Normal
+     }
+ 
+     impl ToComputedValue for SpecifiedValue {
+         type ComputedValue = computed_value::T;
+ 
+         #[inline]
+         fn to_computed_value(&self, _context: &Context) -> computed_value::T {
+-            use std::ascii::AsciiExt;
++            #[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+             match *self {
+                 SpecifiedValue::Normal => computed_value::T(0),
+                 SpecifiedValue::Override(ref lang) => {
+                     if lang.is_empty() || lang.len() > 4 || !lang.is_ascii() {
+                         return computed_value::T(0)
+                     }
+                     let mut computed_lang = lang.clone();
+                     while computed_lang.len() < 4 {
+diff --git a/servo/components/style/properties/longhand/pointing.mako.rs b/servo/components/style/properties/longhand/pointing.mako.rs
+--- a/servo/components/style/properties/longhand/pointing.mako.rs
++++ b/servo/components/style/properties/longhand/pointing.mako.rs
+@@ -85,17 +85,17 @@
+             images: vec![],
+             keyword: computed_value::Keyword::Auto
+         }
+     }
+ 
+     impl Parse for computed_value::Keyword {
+         fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>)
+                          -> Result<computed_value::Keyword, ParseError<'i>> {
+-            use std::ascii::AsciiExt;
++            #[allow(unused_imports)] use std::ascii::AsciiExt;
+             use style_traits::cursor::Cursor;
+             let ident = input.expect_ident()?;
+             if ident.eq_ignore_ascii_case("auto") {
+                 Ok(computed_value::Keyword::Auto)
+             } else {
+                 Cursor::from_css_keyword(&ident)
+                     .map(computed_value::Keyword::Cursor)
+                     .map_err(|()| SelectorParseError::UnexpectedIdent(ident.clone()).into())
+diff --git a/servo/components/style/servo/selector_parser.rs b/servo/components/style/servo/selector_parser.rs
+--- a/servo/components/style/servo/selector_parser.rs
++++ b/servo/components/style/servo/selector_parser.rs
+@@ -16,17 +16,17 @@ use invalidation::element::element_wrapp
+ use properties::ComputedValues;
+ use properties::PropertyFlags;
+ use properties::longhands::display::computed_value as display;
+ use selector_parser::{AttrValue as SelectorAttrValue, ElementExt, PseudoElementCascadeType, SelectorParser};
+ use selectors::Element;
+ use selectors::attr::{AttrSelectorOperation, NamespaceConstraint, CaseSensitivity};
+ use selectors::parser::{SelectorMethods, SelectorParseError};
+ use selectors::visitor::SelectorVisitor;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use std::fmt::Debug;
+ use std::mem;
+ use std::ops::{Deref, DerefMut};
+ use style_traits::{ParseError, StyleParseError};
+ 
+ /// A pseudo-element, both public and private.
+ ///
+diff --git a/servo/components/style/str.rs b/servo/components/style/str.rs
+--- a/servo/components/style/str.rs
++++ b/servo/components/style/str.rs
+@@ -2,17 +2,17 @@
+  * 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/. */
+ 
+ //! String utils for attributes and similar stuff.
+ 
+ #![deny(missing_docs)]
+ 
+ use num_traits::ToPrimitive;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] #[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::convert::AsRef;
+ use std::iter::{Filter, Peekable};
+ use std::str::Split;
+ 
+ /// A static slice of characters.
+ pub type StaticCharVec = &'static [char];
+ 
+diff --git a/servo/components/style/stylesheets/viewport_rule.rs b/servo/components/style/stylesheets/viewport_rule.rs
+--- a/servo/components/style/stylesheets/viewport_rule.rs
++++ b/servo/components/style/stylesheets/viewport_rule.rs
+@@ -15,17 +15,17 @@ use error_reporting::{ContextualParseErr
+ use euclid::TypedSize2D;
+ use font_metrics::get_metrics_provider_for_product;
+ use media_queries::Device;
+ use parser::{ParserContext, ParserErrorContext};
+ use properties::StyleBuilder;
+ use rule_cache::RuleCacheConditions;
+ use selectors::parser::SelectorParseError;
+ use shared_lock::{SharedRwLockReadGuard, StylesheetGuards, ToCssWithGuard};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::borrow::Cow;
+ use std::cell::RefCell;
+ use std::fmt;
+ use std::iter::Enumerate;
+ use std::str::Chars;
+ use style_traits::{PinchZoomFactor, ToCss, ParseError, StyleParseError};
+ use style_traits::viewport::{Orientation, UserZoom, ViewportConstraints, Zoom};
+ use stylesheets::{StylesheetInDocument, Origin};
+diff --git a/servo/components/style/values/mod.rs b/servo/components/style/values/mod.rs
+--- a/servo/components/style/values/mod.rs
++++ b/servo/components/style/values/mod.rs
+@@ -7,17 +7,17 @@
+ //! [values]: https://drafts.csswg.org/css-values/
+ 
+ #![deny(missing_docs)]
+ 
+ use Atom;
+ pub use cssparser::{RGBA, Token, Parser, serialize_identifier, BasicParseError, CowRcStr};
+ use parser::{Parse, ParserContext};
+ use selectors::parser::SelectorParseError;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt::{self, Debug};
+ use std::hash;
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ 
+ pub mod animated;
+ pub mod computed;
+ pub mod distance;
+ pub mod generics;
+diff --git a/servo/components/style/values/specified/align.rs b/servo/components/style/values/specified/align.rs
+--- a/servo/components/style/values/specified/align.rs
++++ b/servo/components/style/values/specified/align.rs
+@@ -5,17 +5,17 @@
+ //! Values for CSS Box Alignment properties
+ //!
+ //! https://drafts.csswg.org/css-align/
+ 
+ use cssparser::Parser;
+ use gecko_bindings::structs;
+ use parser::{Parse, ParserContext};
+ use selectors::parser::SelectorParseError;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ 
+ bitflags! {
+     /// Constants shared by multiple CSS Box Alignment properties
+     ///
+     /// These constants match Gecko's `NS_STYLE_ALIGN_*` constants.
+     #[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
+diff --git a/servo/components/style/values/specified/angle.rs b/servo/components/style/values/specified/angle.rs
+--- a/servo/components/style/values/specified/angle.rs
++++ b/servo/components/style/values/specified/angle.rs
+@@ -1,17 +1,17 @@
+ /* 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/. */
+ 
+ //! Specified angles.
+ 
+ use cssparser::{Parser, Token, BasicParseError};
+ use parser::{ParserContext, Parse};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use style_traits::{ToCss, ParseError};
+ use values::CSSFloat;
+ use values::computed::{Context, ToComputedValue};
+ use values::computed::angle::Angle as ComputedAngle;
+ use values::specified::calc::CalcNode;
+ 
+ /// A specified angle.
+diff --git a/servo/components/style/values/specified/calc.rs b/servo/components/style/values/specified/calc.rs
+--- a/servo/components/style/values/specified/calc.rs
++++ b/servo/components/style/values/specified/calc.rs
+@@ -3,17 +3,17 @@
+  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+ //! [Calc expressions][calc].
+ //!
+ //! [calc]: https://drafts.csswg.org/css-values/#calc-notation
+ 
+ use cssparser::{Parser, Token, BasicParseError};
+ use parser::ParserContext;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ use style_traits::values::specified::AllowedNumericType;
+ use values::{CSSInteger, CSSFloat};
+ use values::computed;
+ use values::specified::{Angle, Time};
+ use values::specified::length::{AbsoluteLength, FontRelativeLength, NoCalcLength};
+ use values::specified::length::ViewportPercentageLength;
+diff --git a/servo/components/style/values/specified/grid.rs b/servo/components/style/values/specified/grid.rs
+--- a/servo/components/style/values/specified/grid.rs
++++ b/servo/components/style/values/specified/grid.rs
+@@ -2,17 +2,17 @@
+  * 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/. */
+ 
+ //! CSS handling for the computed value of
+ //! [grids](https://drafts.csswg.org/css-grid/)
+ 
+ use cssparser::{Parser, Token, BasicParseError};
+ use parser::{Parse, ParserContext};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::mem;
+ use style_traits::{ParseError, StyleParseError};
+ use values::{CSSFloat, CustomIdent};
+ use values::computed::{self, Context, ToComputedValue};
+ use values::generics::grid::{GridTemplateComponent, RepeatCount, TrackBreadth, TrackKeyword, TrackRepeat};
+ use values::generics::grid::{LineNameList, TrackSize, TrackList, TrackListType, TrackListValue};
+ use values::specified::{LengthOrPercentage, Integer};
+ 
+diff --git a/servo/components/style/values/specified/length.rs b/servo/components/style/values/specified/length.rs
+--- a/servo/components/style/values/specified/length.rs
++++ b/servo/components/style/values/specified/length.rs
+@@ -7,17 +7,17 @@
+ //! [length]: https://drafts.csswg.org/css-values/#lengths
+ 
+ use app_units::Au;
+ use cssparser::{Parser, Token, BasicParseError};
+ use euclid::Size2D;
+ use font_metrics::FontMetricsQueryResult;
+ use parser::{Parse, ParserContext};
+ use std::{cmp, fmt, mem};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::ops::{Add, Mul};
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ use style_traits::values::specified::AllowedNumericType;
+ use stylesheets::CssRuleType;
+ use super::{AllowQuirks, Number, ToComputedValue, Percentage};
+ use values::{Auto, CSSFloat, Either, FONT_MEDIUM_PX, None_, Normal};
+ use values::{ExtremumLength, serialize_dimension};
+ use values::computed::{self, CSSPixelLength, Context};
+diff --git a/servo/components/style/values/specified/mod.rs b/servo/components/style/values/specified/mod.rs
+--- a/servo/components/style/values/specified/mod.rs
++++ b/servo/components/style/values/specified/mod.rs
+@@ -6,17 +6,17 @@
+ //!
+ //! TODO(emilio): Enhance docs.
+ 
+ use Namespace;
+ use context::QuirksMode;
+ use cssparser::{Parser, Token, serialize_identifier, BasicParseError};
+ use parser::{ParserContext, Parse};
+ use self::url::SpecifiedUrl;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::f32;
+ use std::fmt;
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ use style_traits::values::specified::AllowedNumericType;
+ use super::{Auto, CSSFloat, CSSInteger, Either, None_};
+ use super::computed::{Context, ToComputedValue};
+ use super::generics::{GreaterThanOrEqualToOne, NonNegative};
+ use super::generics::grid::{GridLine as GenericGridLine, TrackBreadth as GenericTrackBreadth};
+diff --git a/servo/components/style/values/specified/percentage.rs b/servo/components/style/values/specified/percentage.rs
+--- a/servo/components/style/values/specified/percentage.rs
++++ b/servo/components/style/values/specified/percentage.rs
+@@ -1,17 +1,17 @@
+ /* 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/. */
+ 
+ //! Specified percentages.
+ 
+ use cssparser::{BasicParseError, Parser, Token};
+ use parser::{Parse, ParserContext};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use style_traits::{ParseError, ToCss};
+ use style_traits::values::specified::AllowedNumericType;
+ use values::{CSSFloat, serialize_percentage};
+ use values::computed::{Context, ToComputedValue};
+ use values::computed::percentage::Percentage as ComputedPercentage;
+ use values::specified::calc::CalcNode;
+ 
+diff --git a/servo/components/style/values/specified/text.rs b/servo/components/style/values/specified/text.rs
+--- a/servo/components/style/values/specified/text.rs
++++ b/servo/components/style/values/specified/text.rs
+@@ -2,17 +2,17 @@
+  * 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/. */
+ 
+ //! Specified types for text properties.
+ 
+ use cssparser::Parser;
+ use parser::{Parse, ParserContext};
+ use selectors::parser::SelectorParseError;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use style_traits::ParseError;
+ use values::computed::{Context, ToComputedValue};
+ use values::computed::text::LineHeight as ComputedLineHeight;
+ use values::generics::text::InitialLetter as GenericInitialLetter;
+ use values::generics::text::LineHeight as GenericLineHeight;
+ use values::generics::text::Spacing;
+ use values::specified::{AllowQuirks, Integer, NonNegativeNumber, Number};
+ use values::specified::length::{FontRelativeLength, Length, LengthOrPercentage, NoCalcLength};
+diff --git a/servo/components/style/values/specified/time.rs b/servo/components/style/values/specified/time.rs
+--- a/servo/components/style/values/specified/time.rs
++++ b/servo/components/style/values/specified/time.rs
+@@ -1,17 +1,17 @@
+ /* 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/. */
+ 
+ //! Specified time values.
+ 
+ use cssparser::{Parser, Token, BasicParseError};
+ use parser::{ParserContext, Parse};
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ use style_traits::{ToCss, ParseError, StyleParseError};
+ use style_traits::values::specified::AllowedNumericType;
+ use values::CSSFloat;
+ use values::computed::{Context, ToComputedValue};
+ use values::computed::time::Time as ComputedTime;
+ use values::specified::calc::CalcNode;
+ 
+diff --git a/servo/components/style_traits/viewport.rs b/servo/components/style_traits/viewport.rs
+--- a/servo/components/style_traits/viewport.rs
++++ b/servo/components/style_traits/viewport.rs
+@@ -2,17 +2,17 @@
+  * 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/. */
+ 
+ //! Helper types for the `@viewport` rule.
+ 
+ use {CSSPixel, PinchZoomFactor, ParseError};
+ use cssparser::{Parser, ToCss, ParseError as CssParseError, BasicParseError};
+ use euclid::TypedSize2D;
+-use std::ascii::AsciiExt;
++#[allow(unused_imports)] use std::ascii::AsciiExt;
+ use std::fmt;
+ 
+ define_css_keyword_enum!(UserZoom:
+                          "zoom" => Zoom,
+                          "fixed" => Fixed);
+ 
+ define_css_keyword_enum!(Orientation:
+                          "auto" => Auto,