clippy: fix warnings introduced by Rust 1.75

src/uu/csplit/src/patterns.rs

@@ -196,7 +196,7 @@ mod tests {
             .collect();
         let patterns = get_patterns(input.as_slice()).unwrap();
         assert_eq!(patterns.len(), 3);
-        match patterns.get(0) {
+        match patterns.first() {
             Some(Pattern::UpToLine(24, ExecutePattern::Times(1))) => (),
             _ => panic!("expected UpToLine pattern"),
         };
@@ -227,7 +227,7 @@ mod tests {
         .collect();
         let patterns = get_patterns(input.as_slice()).unwrap();
         assert_eq!(patterns.len(), 5);
-        match patterns.get(0) {
+        match patterns.first() {
             Some(Pattern::UpToMatch(reg, 0, ExecutePattern::Times(1))) => {
                 let parsed_reg = format!("{reg}");
                 assert_eq!(parsed_reg, "test1.*end$");
@@ -281,7 +281,7 @@ mod tests {
         .collect();
         let patterns = get_patterns(input.as_slice()).unwrap();
         assert_eq!(patterns.len(), 5);
-        match patterns.get(0) {
+        match patterns.first() {
             Some(Pattern::SkipToMatch(reg, 0, ExecutePattern::Times(1))) => {
                 let parsed_reg = format!("{reg}");
                 assert_eq!(parsed_reg, "test1.*end$");

src/uu/factor/src/factor.rs

@@ -3,6 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
+#![allow(clippy::items_after_test_module)]
 use smallvec::SmallVec;
 use std::cell::RefCell;
 use std::fmt;

src/uu/kill/src/kill.rs

@@ -71,7 +71,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             table();
             Ok(())
         }
-        Mode::List => list(pids_or_signals.get(0)),
+        Mode::List => list(pids_or_signals.first()),
     }
 }
 

tests/by-util/test_ls.rs

@@ -4139,7 +4139,7 @@ fn test_ls_hyperlink_dirs() {
     assert!(result
         .stdout_str()
         .lines()
-        .nth(0)
+        .next()
         .unwrap()
         .contains(&format!("{path}{separator}{dir_a}\x07{dir_a}\x1b]8;;\x07:")));
     assert_eq!(result.stdout_str().lines().nth(1).unwrap(), "");

tests/by-util/test_test.rs

@@ -696,7 +696,7 @@ fn test_file_owned_by_egid() {
     if user_gid != file_gid {
         let file_uid = metadata.uid();
         let path = CString::new(at.plus("regular_file").as_os_str().as_bytes()).expect("bad path");
-        let r = unsafe { libc::chown(path.as_ptr().into(), file_uid, user_gid) };
+        let r = unsafe { libc::chown(path.as_ptr(), file_uid, user_gid) };
         assert_ne!(r, -1);
     }