# 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,