Apply a few minor clippy fixes

src/book/mod.rs

@@ -330,7 +330,7 @@ impl MDBook {
 
                 let mut cmd = Command::new("rustdoc");
                 cmd.current_dir(temp_dir.path())
-                    .arg(&chapter_path)
+                    .arg(chapter_path)
                     .arg("--test")
                     .args(&library_args);
 
@@ -349,7 +349,7 @@ impl MDBook {
                 }
 
                 if color_output {
-                    cmd.args(&["--color", "always"]);
+                    cmd.args(["--color", "always"]);
                 }
 
                 debug!("running {:?}", cmd);

src/book/summary.rs

@@ -583,11 +583,13 @@ fn get_last_link(links: &mut [SummaryItem]) -> Result<(usize, &mut Link)> {
         .iter_mut()
         .enumerate()
         .filter_map(|(i, item)| item.maybe_link_mut().map(|l| (i, l)))
-        .rev()
+        .next_back()
-        .next()
+        .ok_or_else(|| {
-        .ok_or_else(||
+            anyhow::anyhow!(
-            anyhow::anyhow!("Unable to get last link because the list of SummaryItems doesn't contain any Links")
+                "Unable to get last link because the list of SummaryItems \
+                 doesn't contain any Links"
             )
+        })
 }
 
 /// Removes the styling from a list of Markdown events and returns just the

src/cmd/watch.rs

@@ -99,7 +99,7 @@ fn filter_ignored_files(ignore: Gitignore, paths: &[PathBuf]) -> Vec<PathBuf> {
         .iter()
         .filter(|path| {
             let relative_path =
-                diff_paths(&path, &ignore_root).expect("One of the paths should be an absolute");
+                diff_paths(path, &ignore_root).expect("One of the paths should be an absolute");
             !ignore
                 .matched_path_or_any_parents(&relative_path, relative_path.is_dir())
                 .is_ignore()

src/config.rs

@@ -694,21 +694,13 @@ impl Default for Playground {
 }
 
 /// Configuration for tweaking how the HTML renderer handles code blocks.
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "kebab-case")]
 pub struct Code {
     /// A prefix string to hide lines per language (one or more chars).
     pub hidelines: HashMap<String, String>,
 }
 
-impl Default for Code {
-    fn default() -> Code {
-        Code {
-            hidelines: HashMap::new(),
-        }
-    }
-}
-
 /// Configuration of the search functionality of the HTML renderer.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "kebab-case")]

src/renderer/html_handlebars/helpers/toc.rs

@@ -75,7 +75,7 @@ impl HelperDef for RenderToc {
 
         for item in chapters {
             // Spacer
-            if item.get("spacer").is_some() {
+            if item.contains_key("spacer") {
                 out.write("<li class=\"spacer\"></li>")?;
                 continue;
             }
@@ -114,7 +114,7 @@ impl HelperDef for RenderToc {
                     write_li_open_tag(out, is_expanded, false)?;
                 }
                 Ordering::Equal => {
-                    write_li_open_tag(out, is_expanded, item.get("section").is_none())?;
+                    write_li_open_tag(out, is_expanded, !item.contains_key("section"))?;
                 }
             }