needless_borrow

this expression creates a reference which is immediately dereferenced by the compiler

Author: ChrisDenton

library/std/src/sys/windows/fs.rs

@@ -548,7 +548,7 @@ impl File {
                 let user = super::args::from_wide_to_user_path(
                     subst.iter().copied().chain([0]).collect(),
                 )?;
-                Ok(PathBuf::from(OsString::from_wide(&user.strip_suffix(&[0]).unwrap_or(&user))))
+                Ok(PathBuf::from(OsString::from_wide(user.strip_suffix(&[0]).unwrap_or(&user))))
             } else {
                 Ok(PathBuf::from(OsString::from_wide(subst)))
             }
@@ -874,7 +874,7 @@ impl fmt::Debug for File {
         // FIXME(#24570): add more info here (e.g., mode)
         let mut b = f.debug_struct("File");
         b.field("handle", &self.handle.as_raw_handle());
-        if let Ok(path) = get_path(&self) {
+        if let Ok(path) = get_path(self) {
             b.field("path", &path);
         }
         b.finish()
@@ -1193,7 +1193,7 @@ pub fn readlink(path: &Path) -> io::Result<PathBuf> {
     let mut opts = OpenOptions::new();
     opts.access_mode(0);
     opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT | c::FILE_FLAG_BACKUP_SEMANTICS);
-    let file = File::open(&path, &opts)?;
+    let file = File::open(path, &opts)?;
     file.readlink()
 }
 
@@ -1407,7 +1407,7 @@ pub fn symlink_junction<P: AsRef<Path>, Q: AsRef<Path>>(
 #[allow(dead_code)]
 fn symlink_junction_inner(original: &Path, junction: &Path) -> io::Result<()> {
     let d = DirBuilder::new();
-    d.mkdir(&junction)?;
+    d.mkdir(junction)?;
 
     let mut opts = OpenOptions::new();
     opts.write(true);

library/std/src/sys/windows/handle.rs

@@ -189,7 +189,7 @@ impl Handle {
     }
 
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
-        self.synchronous_write(&buf, None)
+        self.synchronous_write(buf, None)
     }
 
     pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
@@ -202,7 +202,7 @@ impl Handle {
     }
 
     pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
-        self.synchronous_write(&buf, Some(offset))
+        self.synchronous_write(buf, Some(offset))
     }
 
     pub fn try_clone(&self) -> io::Result<Self> {

library/std/src/sys/windows/mod.rs

@@ -63,7 +63,7 @@ pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {
 
     // Normally, `thread::spawn` will call `Thread::set_name` but since this thread already
     // exists, we have to call it ourselves.
-    thread::Thread::set_name(&CStr::from_bytes_with_nul_unchecked(b"main\0"));
+    thread::Thread::set_name(CStr::from_bytes_with_nul_unchecked(b"main\0"));
 }
 
 // SAFETY: must be called only once during runtime cleanup.

library/std/src/sys/windows/stdio.rs

@@ -195,7 +195,7 @@ fn write_valid_utf8_to_console(handle: c::HANDLE, utf8: &str) -> io::Result<usiz
         MaybeUninit::slice_assume_init_ref(&utf16[..result as usize])
     };
 
-    let mut written = write_u16s(handle, &utf16)?;
+    let mut written = write_u16s(handle, utf16)?;
 
     // Figure out how many bytes of as UTF-8 were written away as UTF-16.
     if written == utf16.len() {