Fix some nightly clippy warnings

src/web/metrics.rs

@@ -13,7 +13,7 @@ pub(super) fn metrics_handler(req: &mut Request) -> IronResult<Response> {
     let queue = extension!(req, BuildQueue);
 
     let mut buffer = Vec::new();
-    let families = ctry!(req, metrics.gather(pool, &*queue));
+    let families = ctry!(req, metrics.gather(pool, queue));
     ctry!(req, TextEncoder::new().encode(&families, &mut buffer));
 
     let mut resp = Response::with(buffer);

src/web/routes.rs

@@ -354,7 +354,7 @@ impl BlockBlacklistedPrefixes {
 
 impl Handler for BlockBlacklistedPrefixes {
     fn handle(&self, req: &mut iron::Request) -> iron::IronResult<iron::Response> {
-        if let Some(prefix) = req.url.path().get(0) {
+        if let Some(prefix) = req.url.path().first() {
             if self.blacklist.contains(*prefix) {
                 return Err(super::error::Nope::CrateNotFound.into());
             }

src/web/rustdoc.rs

@@ -358,7 +358,7 @@ pub fn rustdoc_html_server_handler(req: &mut Request) -> IronResult<Response> {
 
     // if visiting the full path to the default target, remove the target from the path
     // expects a req_path that looks like `[/:target]/.*`
-    if req_path.get(0).copied() == Some(&krate.metadata.default_target) {
+    if req_path.first().copied() == Some(&krate.metadata.default_target) {
         return redirect(&name, &version_or_latest, &req_path[1..]);
     }
 
@@ -395,7 +395,7 @@ pub fn rustdoc_html_server_handler(req: &mut Request) -> IronResult<Response> {
                 storage.rustdoc_file_exists(&name, &version, &path, krate.archive_storage)
             ) {
                 redirect(&name, &version_or_latest, &req_path)
-            } else if req_path.get(0).map_or(false, |p| p.contains('-')) {
+            } else if req_path.first().map_or(false, |p| p.contains('-')) {
                 // This is a target, not a module; it may not have been built.
                 // Redirect to the default target and show a search page instead of a hard 404.
                 redirect(
@@ -534,7 +534,7 @@ fn path_for_version(file_path: &[&str], crate_details: &CrateDetails) -> String
     };
     let is_source_view = if platform.is_empty() {
         // /{name}/{version}/src/{crate}/index.html
-        file_path.get(0).copied() == Some("src")
+        file_path.first().copied() == Some("src")
     } else {
         // /{name}/{version}/{platform}/src/{crate}/index.html
         file_path.get(1).copied() == Some("src")