Auto merge of #93921 - matthiaskrgr:rollup-wn3jlxj, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #90955 (Rename `FilenameTooLong` to `InvalidFilename` and also use it for Windows' `ERROR_INVALID_NAME`)
 - #91607 (Make `span_extend_to_prev_str()` more robust)
 - #92895 (Remove some unused functionality)
 - #93635 (Add missing platform-specific information on current_dir and set_current_dir)
 - #93660 (rustdoc-json: Add some tests for typealias item)
 - #93782 (Split `pauth` target feature)
 - #93868 (Fix incorrect register conflict detection in asm!)
 - #93888 (Implement `AsFd` for `&T` and `&mut T`.)
 - #93909 (Fix typo: explicitely -> explicitly)
 - #93910 (fix mention of moved function in `rustc_hir` docs)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

9 files changed, 67 insertions, 9 deletions

diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index c06928647d3..5ed9fa9d6f0 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -23,6 +23,11 @@ use crate::sys::os as os_imp;
 
 /// Returns the current working directory as a [`PathBuf`].
 ///
+/// # Platform-specific behavior
+///
+/// This function currently corresponds to the `getcwd` function on Unix
+/// and the `GetCurrentDirectoryW` function on Windows.
+///
 /// # Errors
 ///
 /// Returns an [`Err`] if the current working directory value is invalid.
@@ -49,6 +54,11 @@ pub fn current_dir() -> io::Result<PathBuf> {
 
 /// Changes the current working directory to the specified path.
 ///
+/// # Platform-specific behavior
+///
+/// This function currently corresponds to the `chdir` function on Unix
+/// and the `SetCurrentDirectoryW` function on Windows.
+///
 /// Returns an [`Err`] if the operation fails.
 ///
 /// # Examples
diff --git a/library/std/src/io/error.rs b/library/std/src/io/error.rs
index 4b55324a242..1aa6d657889 100644
--- a/library/std/src/io/error.rs
+++ b/library/std/src/io/error.rs
@@ -296,12 +296,11 @@ pub enum ErrorKind {
     /// The filesystem does not support making so many hardlinks to the same file.
     #[unstable(feature = "io_error_more", issue = "86442")]
     TooManyLinks,
-    /// Filename too long.
+    /// A filename was invalid.
     ///
-    /// The limit might be from the underlying filesystem or API, or an administratively imposed
-    /// resource limit.
+    /// This error can also cause if it exceeded the filename length limit.
     #[unstable(feature = "io_error_more", issue = "86442")]
-    FilenameTooLong,
+    InvalidFilename,
     /// Program argument list too long.
     ///
     /// When trying to run an external program, a system or process limit on the size of the
@@ -382,12 +381,12 @@ impl ErrorKind {
             DirectoryNotEmpty => "directory not empty",
             ExecutableFileBusy => "executable file busy",
             FileTooLarge => "file too large",
-            FilenameTooLong => "filename too long",
             FilesystemLoop => "filesystem loop or indirection limit (e.g. symlink loop)",
             FilesystemQuotaExceeded => "filesystem quota exceeded",
             HostUnreachable => "host unreachable",
             Interrupted => "operation interrupted",
             InvalidData => "invalid data",
+            InvalidFilename => "invalid filename",
             InvalidInput => "invalid input parameter",
             IsADirectory => "is a directory",
             NetworkDown => "network down",
diff --git a/library/std/src/io/error/repr_bitpacked.rs b/library/std/src/io/error/repr_bitpacked.rs
index f317368e8e5..4301e941b3d 100644
--- a/library/std/src/io/error/repr_bitpacked.rs
+++ b/library/std/src/io/error/repr_bitpacked.rs
@@ -315,7 +315,7 @@ fn kind_from_prim(ek: u32) -> Option<ErrorKind> {
         Deadlock,
         CrossesDevices,
         TooManyLinks,
-        FilenameTooLong,
+        InvalidFilename,
         ArgumentListTooLong,
         Interrupted,
         Other,
diff --git a/library/std/src/os/fd/owned.rs b/library/std/src/os/fd/owned.rs
index b53c3e79b0f..71c660e7186 100644
--- a/library/std/src/os/fd/owned.rs
+++ b/library/std/src/os/fd/owned.rs
@@ -201,6 +201,22 @@ pub trait AsFd {
 }
 
 #[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsFd> AsFd for &T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsFd> AsFd for &mut T {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        T::as_fd(self)
+    }
+}
+
+#[unstable(feature = "io_safety", issue = "87074")]
 impl AsFd for BorrowedFd<'_> {
     #[inline]
     fn as_fd(&self) -> BorrowedFd<'_> {
diff --git a/library/std/src/os/unix/fs.rs b/library/std/src/os/unix/fs.rs
index db7edcd0574..75d65e6d5fc 100644
--- a/library/std/src/os/unix/fs.rs
+++ b/library/std/src/os/unix/fs.rs
@@ -966,7 +966,7 @@ pub fn chown<P: AsRef<Path>>(dir: P, uid: Option<u32>, gid: Option<u32>) -> io::
 ///
 /// fn main() -> std::io::Result<()> {
 ///     let f = std::fs::File::open("/file")?;
-///     fs::fchown(f, Some(0), Some(0))?;
+///     fs::fchown(&f, Some(0), Some(0))?;
 ///     Ok(())
 /// }
 /// ```
diff --git a/library/std/src/os/windows/io/handle.rs b/library/std/src/os/windows/io/handle.rs
index e37ce633a12..8df6c54a414 100644
--- a/library/std/src/os/windows/io/handle.rs
+++ b/library/std/src/os/windows/io/handle.rs
@@ -316,6 +316,22 @@ pub trait AsHandle {
     fn as_handle(&self) -> BorrowedHandle<'_>;
 }
 
+#[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsHandle> AsHandle for &T {
+    #[inline]
+    fn as_handle(&self) -> BorrowedHandle<'_> {
+        T::as_handle(self)
+    }
+}
+
+#[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsHandle> AsHandle for &mut T {
+    #[inline]
+    fn as_handle(&self) -> BorrowedHandle<'_> {
+        T::as_handle(self)
+    }
+}
+
 impl AsHandle for BorrowedHandle<'_> {
     #[inline]
     fn as_handle(&self) -> BorrowedHandle<'_> {
diff --git a/library/std/src/os/windows/io/socket.rs b/library/std/src/os/windows/io/socket.rs
index d3a5b6dcc76..2f13eb77a1b 100644
--- a/library/std/src/os/windows/io/socket.rs
+++ b/library/std/src/os/windows/io/socket.rs
@@ -210,6 +210,22 @@ pub trait AsSocket {
     fn as_socket(&self) -> BorrowedSocket<'_>;
 }
 
+#[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsSocket> AsSocket for &T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
+#[unstable(feature = "io_safety", issue = "87074")]
+impl<T: AsSocket> AsSocket for &mut T {
+    #[inline]
+    fn as_socket(&self) -> BorrowedSocket<'_> {
+        T::as_socket(self)
+    }
+}
+
 impl AsSocket for BorrowedSocket<'_> {
     #[inline]
     fn as_socket(&self) -> BorrowedSocket<'_> {
diff --git a/library/std/src/sys/unix/mod.rs b/library/std/src/sys/unix/mod.rs
index 6382354eb6e..605cc499b3c 100644
--- a/library/std/src/sys/unix/mod.rs
+++ b/library/std/src/sys/unix/mod.rs
@@ -159,7 +159,7 @@ pub fn decode_error_kind(errno: i32) -> ErrorKind {
         libc::ENOSPC => StorageFull,
         libc::ENOSYS => Unsupported,
         libc::EMLINK => TooManyLinks,
-        libc::ENAMETOOLONG => FilenameTooLong,
+        libc::ENAMETOOLONG => InvalidFilename,
         libc::ENETDOWN => NetworkDown,
         libc::ENETUNREACH => NetworkUnreachable,
         libc::ENOTCONN => NotConnected,
diff --git a/library/std/src/sys/windows/mod.rs b/library/std/src/sys/windows/mod.rs
index c70f254cf39..dc288176346 100644
--- a/library/std/src/sys/windows/mod.rs
+++ b/library/std/src/sys/windows/mod.rs
@@ -71,6 +71,7 @@ pub fn decode_error_kind(errno: i32) -> ErrorKind {
         c::ERROR_FILE_NOT_FOUND => return NotFound,
         c::ERROR_PATH_NOT_FOUND => return NotFound,
         c::ERROR_NO_DATA => return BrokenPipe,
+        c::ERROR_INVALID_NAME => return InvalidFilename,
         c::ERROR_INVALID_PARAMETER => return InvalidInput,
         c::ERROR_NOT_ENOUGH_MEMORY | c::ERROR_OUTOFMEMORY => return OutOfMemory,
         c::ERROR_SEM_TIMEOUT
@@ -104,7 +105,7 @@ pub fn decode_error_kind(errno: i32) -> ErrorKind {
         c::ERROR_POSSIBLE_DEADLOCK => return Deadlock,
         c::ERROR_NOT_SAME_DEVICE => return CrossesDevices,
         c::ERROR_TOO_MANY_LINKS => return TooManyLinks,
-        c::ERROR_FILENAME_EXCED_RANGE => return FilenameTooLong,
+        c::ERROR_FILENAME_EXCED_RANGE => return InvalidFilename,
         _ => {}
     }