Bug 1549301 - Fix some warnings.

servo/components/derive_common/lib.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 extern crate darling;
-extern crate proc_macro;
 extern crate proc_macro2;
 #[macro_use]
 extern crate quote;

servo/components/style/error_reporting.rs

@@ -245,7 +245,6 @@ impl ParseErrorReporter for RustLogReporter {
         location: SourceLocation,
         error: ContextualParseError,
     ) {
-        use log;
         if log_enabled!(log::Level::Info) {
             info!(
                 "Url:\t{}\n{}:{} {}",

servo/components/style/servo/selector_parser.rs

@@ -345,7 +345,6 @@ impl NonTSPseudoClass {
     /// selector matching, and it's set from the DOM.
     pub fn state_flag(&self) -> ElementState {
         use self::NonTSPseudoClass::*;
-        use crate::element_state::ElementState;
         match *self {
             Active => ElementState::IN_ACTIVE_STATE,
             Focus => ElementState::IN_FOCUS_STATE,

servo/components/style_derive/animate.rs

@@ -25,7 +25,7 @@ pub fn derive(mut input: DeriveInput) -> TokenStream {
         let s = Structure::new(&input);
         let mut append_error_clause = s.variants().len() > 1;
 
-        let mut match_body = s.variants().iter().fold(quote!(), |body, variant| {
+        let match_body = s.variants().iter().fold(quote!(), |body, variant| {
             let arm = match derive_variant_arm(variant, &mut where_clause) {
                 Ok(arm) => arm,
                 Err(()) => {