Cover more codes and fix Clippy warnings

src/problem_0869_reordered_power_of_2/mod.rs

@@ -15,6 +15,7 @@ mod tests {
             (16, true),
             (24, false),
             (46, true),
+            (124, false),
             (821, true),
             (1_420, true),
             (14_683, true),

src/problem_1851_minimum_interval_to_include_each_query/binary_heap_and_binary_search.rs

@@ -105,6 +105,13 @@ impl super::Solution for Solution {
 
 #[cfg(test)]
 mod tests {
+    use super::Item;
+
+    #[test]
+    fn test_item_partial_eq() {
+        assert!(Item { size: 2, index: 3 } == Item { size: 2, index: 5 });
+    }
+
     #[test]
     fn test_solution() {
         super::super::tests::run::<super::Solution>();

src/problem_1857_largest_color_value_in_a_directed_graph/dfs.rs

@@ -107,6 +107,18 @@ impl super::Solution for Solution {
 
 #[cfg(test)]
 mod tests {
+    #[test]
+    #[should_panic(expected = "internal error: entered unreachable code")]
+    fn test_unwrap_visited_failure_1() {
+        super::Solution::unwrap_visited(&super::State::NotVisited);
+    }
+
+    #[test]
+    #[should_panic(expected = "internal error: entered unreachable code")]
+    fn test_unwrap_visited_failure_2() {
+        super::Solution::unwrap_visited(&super::State::Visiting);
+    }
+
     #[test]
     fn test_solution() {
         super::super::tests::run::<super::Solution>();

xtask/src/coverage/mod.rs

@@ -40,7 +40,7 @@ impl FromStr for OutputType {
 }
 
 impl Display for OutputType {
-    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_str(self.value())
     }
 }

xtask/src/tools/mod.rs

@@ -8,12 +8,10 @@ mod windows;
 
 pub struct RustVersionMeta {
     pub host: String,
-    pub commit_hash: String,
 }
 
 pub fn find_rust_version_meta() -> RustVersionMeta {
     let mut host = None;
-    let mut commit_hash = None;
 
     utilities::run_command_and_stream_output(Command::new("rustc").arg("-vV"), |stdout| {
         for line in BufReader::new(stdout).lines() {
@@ -22,16 +20,11 @@ pub fn find_rust_version_meta() -> RustVersionMeta {
             #[allow(clippy::option_if_let_else)] // False positive.
             if let Some(host_value) = line.strip_prefix("host: ") {
                 host = Some(host_value.to_string());
-            } else if let Some(commit_hash_value) = line.strip_prefix("commit-hash: ") {
-                commit_hash = Some(commit_hash_value.to_string());
             }
         }
     });
 
-    RustVersionMeta {
-        host: host.unwrap(),
-        commit_hash: commit_hash.unwrap(),
-    }
+    RustVersionMeta { host: host.unwrap() }
 }
 
 pub fn find_rust_sysroot() -> PathBuf {