Auto merge of #82718 - JohnTitor:rollup-vpfx3j2, r=JohnTitor

Rollup of 10 pull requests

Successful merges:

 - #81223 ([rustdoc] Generate redirect map file)
 - #82439 (BTree: fix untrue safety)
 - #82469 (Use a crate to produce rustdoc tree comparisons instead of the `diff` command)
 - #82589 (unix: Non-mutable bufs in send_vectored_with_ancillary_to)
 - #82689 (meta: Notify Zulip for rustdoc nominated issues)
 - #82695 (Revert non-power-of-two vector restriction)
 - #82706 (use outer_expn_data() instead of outer_expn().expn_data())
 - #82710 (FloatToInit: Replacing round_unchecked_to --> to_int_unchecked)
 - #82712 (Remove unnecessary conditional `cfg(target_os)` for `redox` and `vxworks`)
 - #82713 (Update cargo)

Failed merges:

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

4 files changed, 48 insertions, 45 deletions

diff --git a/library/std/src/sys/unix/ext/net/ancillary.rs b/library/std/src/sys/unix/ext/net/ancillary.rs
index 0964b6335aa..33d6a39af07 100644
--- a/library/std/src/sys/unix/ext/net/ancillary.rs
+++ b/library/std/src/sys/unix/ext/net/ancillary.rs
@@ -1,6 +1,6 @@
 use super::{sockaddr_un, SocketAddr};
 use crate::convert::TryFrom;
-use crate::io::{self, IoSliceMut};
+use crate::io::{self, IoSlice, IoSliceMut};
 use crate::marker::PhantomData;
 use crate::mem::{size_of, zeroed};
 use crate::os::unix::io::RawFd;
@@ -68,7 +68,7 @@ pub(super) fn recv_vectored_with_ancillary_from(
 pub(super) fn send_vectored_with_ancillary_to(
     socket: &Socket,
     path: Option<&Path>,
-    bufs: &mut [IoSliceMut<'_>],
+    bufs: &[IoSlice<'_>],
     ancillary: &mut SocketAncillary<'_>,
 ) -> io::Result<usize> {
     unsafe {
@@ -78,7 +78,7 @@ pub(super) fn send_vectored_with_ancillary_to(
         let mut msg: libc::msghdr = zeroed();
         msg.msg_name = &mut msg_name as *mut _ as *mut _;
         msg.msg_namelen = msg_namelen;
-        msg.msg_iov = bufs.as_mut_ptr().cast();
+        msg.msg_iov = bufs.as_ptr() as *mut _;
         msg.msg_control = ancillary.buffer.as_mut_ptr().cast();
         cfg_if::cfg_if! {
             if #[cfg(any(target_os = "android", all(target_os = "linux", target_env = "gnu")))] {
@@ -567,7 +567,7 @@ impl<'a> SocketAncillary<'a> {
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixStream, SocketAncillary};
     /// use std::os::unix::io::AsRawFd;
-    /// use std::io::IoSliceMut;
+    /// use std::io::IoSlice;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let sock = UnixStream::connect("/tmp/sock")?;
@@ -577,7 +577,7 @@ impl<'a> SocketAncillary<'a> {
     ///     ancillary.add_fds(&[sock.as_raw_fd()][..]);
     ///
     ///     let mut buf = [1; 8];
-    ///     let mut bufs = &mut [IoSliceMut::new(&mut buf[..])][..];
+    ///     let mut bufs = &mut [IoSlice::new(&mut buf[..])][..];
     ///     sock.send_vectored_with_ancillary(bufs, &mut ancillary)?;
     ///     Ok(())
     /// }
diff --git a/library/std/src/sys/unix/ext/net/datagram.rs b/library/std/src/sys/unix/ext/net/datagram.rs
index 0f532c47c8f..a8c13fbb874 100644
--- a/library/std/src/sys/unix/ext/net/datagram.rs
+++ b/library/std/src/sys/unix/ext/net/datagram.rs
@@ -19,7 +19,7 @@ use super::{sockaddr_un, SocketAddr};
     target_os = "netbsd",
     target_os = "openbsd",
 ))]
-use crate::io::IoSliceMut;
+use crate::io::{IoSlice, IoSliceMut};
 use crate::net::Shutdown;
 use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
 use crate::path::Path;
@@ -506,23 +506,24 @@ impl UnixDatagram {
     /// ```no_run
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
-    /// use std::io::IoSliceMut;
+    /// use std::io::IoSlice;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let sock = UnixDatagram::unbound()?;
-    ///     let mut buf1 = [1; 8];
-    ///     let mut buf2 = [2; 16];
-    ///     let mut buf3 = [3; 8];
-    ///     let mut bufs = &mut [
-    ///         IoSliceMut::new(&mut buf1),
-    ///         IoSliceMut::new(&mut buf2),
-    ///         IoSliceMut::new(&mut buf3),
+    ///     let buf1 = [1; 8];
+    ///     let buf2 = [2; 16];
+    ///     let buf3 = [3; 8];
+    ///     let bufs = &[
+    ///         IoSlice::new(&buf1),
+    ///         IoSlice::new(&buf2),
+    ///         IoSlice::new(&buf3),
     ///     ][..];
     ///     let fds = [0, 1, 2];
     ///     let mut ancillary_buffer = [0; 128];
     ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
     ///     ancillary.add_fds(&fds[..]);
-    ///     sock.send_vectored_with_ancillary_to(bufs, &mut ancillary, "/some/sock").expect("send_vectored_with_ancillary_to function failed");
+    ///     sock.send_vectored_with_ancillary_to(bufs, &mut ancillary, "/some/sock")
+    ///         .expect("send_vectored_with_ancillary_to function failed");
     ///     Ok(())
     /// }
     /// ```
@@ -538,7 +539,7 @@ impl UnixDatagram {
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary_to<P: AsRef<Path>>(
         &self,
-        bufs: &mut [IoSliceMut<'_>],
+        bufs: &[IoSlice<'_>],
         ancillary: &mut SocketAncillary<'_>,
         path: P,
     ) -> io::Result<usize> {
@@ -554,23 +555,24 @@ impl UnixDatagram {
     /// ```no_run
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixDatagram, SocketAncillary};
-    /// use std::io::IoSliceMut;
+    /// use std::io::IoSlice;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let sock = UnixDatagram::unbound()?;
-    ///     let mut buf1 = [1; 8];
-    ///     let mut buf2 = [2; 16];
-    ///     let mut buf3 = [3; 8];
-    ///     let mut bufs = &mut [
-    ///         IoSliceMut::new(&mut buf1),
-    ///         IoSliceMut::new(&mut buf2),
-    ///         IoSliceMut::new(&mut buf3),
+    ///     let buf1 = [1; 8];
+    ///     let buf2 = [2; 16];
+    ///     let buf3 = [3; 8];
+    ///     let bufs = &[
+    ///         IoSlice::new(&buf1),
+    ///         IoSlice::new(&buf2),
+    ///         IoSlice::new(&buf3),
     ///     ][..];
     ///     let fds = [0, 1, 2];
     ///     let mut ancillary_buffer = [0; 128];
     ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
     ///     ancillary.add_fds(&fds[..]);
-    ///     sock.send_vectored_with_ancillary(bufs, &mut ancillary).expect("send_vectored_with_ancillary function failed");
+    ///     sock.send_vectored_with_ancillary(bufs, &mut ancillary)
+    ///         .expect("send_vectored_with_ancillary function failed");
     ///     Ok(())
     /// }
     /// ```
@@ -586,7 +588,7 @@ impl UnixDatagram {
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary(
         &self,
-        bufs: &mut [IoSliceMut<'_>],
+        bufs: &[IoSlice<'_>],
         ancillary: &mut SocketAncillary<'_>,
     ) -> io::Result<usize> {
         send_vectored_with_ancillary_to(&self.0, None, bufs, ancillary)
diff --git a/library/std/src/sys/unix/ext/net/stream.rs b/library/std/src/sys/unix/ext/net/stream.rs
index 9fe6b85837e..fc08edacb82 100644
--- a/library/std/src/sys/unix/ext/net/stream.rs
+++ b/library/std/src/sys/unix/ext/net/stream.rs
@@ -530,23 +530,24 @@ impl UnixStream {
     /// ```no_run
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::{UnixStream, SocketAncillary};
-    /// use std::io::IoSliceMut;
+    /// use std::io::IoSlice;
     ///
     /// fn main() -> std::io::Result<()> {
     ///     let socket = UnixStream::connect("/tmp/sock")?;
-    ///     let mut buf1 = [1; 8];
-    ///     let mut buf2 = [2; 16];
-    ///     let mut buf3 = [3; 8];
-    ///     let mut bufs = &mut [
-    ///         IoSliceMut::new(&mut buf1),
-    ///         IoSliceMut::new(&mut buf2),
-    ///         IoSliceMut::new(&mut buf3),
+    ///     let buf1 = [1; 8];
+    ///     let buf2 = [2; 16];
+    ///     let buf3 = [3; 8];
+    ///     let bufs = &[
+    ///         IoSlice::new(&buf1),
+    ///         IoSlice::new(&buf2),
+    ///         IoSlice::new(&buf3),
     ///     ][..];
     ///     let fds = [0, 1, 2];
     ///     let mut ancillary_buffer = [0; 128];
     ///     let mut ancillary = SocketAncillary::new(&mut ancillary_buffer[..]);
     ///     ancillary.add_fds(&fds[..]);
-    ///     socket.send_vectored_with_ancillary(bufs, &mut ancillary).expect("send_vectored_with_ancillary function failed");
+    ///     socket.send_vectored_with_ancillary(bufs, &mut ancillary)
+    ///         .expect("send_vectored_with_ancillary function failed");
     ///     Ok(())
     /// }
     /// ```
@@ -562,7 +563,7 @@ impl UnixStream {
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn send_vectored_with_ancillary(
         &self,
-        bufs: &mut [IoSliceMut<'_>],
+        bufs: &[IoSlice<'_>],
         ancillary: &mut SocketAncillary<'_>,
     ) -> io::Result<usize> {
         send_vectored_with_ancillary_to(&self.0, None, bufs, ancillary)
diff --git a/library/std/src/sys/unix/ext/net/tests.rs b/library/std/src/sys/unix/ext/net/tests.rs
index 97a016904b4..bd9b6dd727b 100644
--- a/library/std/src/sys/unix/ext/net/tests.rs
+++ b/library/std/src/sys/unix/ext/net/tests.rs
@@ -485,14 +485,14 @@ fn test_unix_datagram_peek_from() {
 fn test_send_vectored_fds_unix_stream() {
     let (s1, s2) = or_panic!(UnixStream::pair());
 
-    let mut buf1 = [1; 8];
-    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+    let buf1 = [1; 8];
+    let bufs_send = &[IoSlice::new(&buf1[..])][..];
 
     let mut ancillary1_buffer = [0; 128];
     let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
     assert!(ancillary1.add_fds(&[s1.as_raw_fd()][..]));
 
-    let usize = or_panic!(s1.send_vectored_with_ancillary(&mut bufs_send, &mut ancillary1));
+    let usize = or_panic!(s1.send_vectored_with_ancillary(&bufs_send, &mut ancillary1));
     assert_eq!(usize, 8);
 
     let mut buf2 = [0; 8];
@@ -542,8 +542,8 @@ fn test_send_vectored_with_ancillary_to_unix_datagram() {
 
     or_panic!(bsock2.set_passcred(true));
 
-    let mut buf1 = [1; 8];
-    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+    let buf1 = [1; 8];
+    let bufs_send = &[IoSlice::new(&buf1[..])][..];
 
     let mut ancillary1_buffer = [0; 128];
     let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
@@ -554,7 +554,7 @@ fn test_send_vectored_with_ancillary_to_unix_datagram() {
     assert!(ancillary1.add_creds(&[cred1.clone()][..]));
 
     let usize =
-        or_panic!(bsock1.send_vectored_with_ancillary_to(&mut bufs_send, &mut ancillary1, &path2));
+        or_panic!(bsock1.send_vectored_with_ancillary_to(&bufs_send, &mut ancillary1, &path2));
     assert_eq!(usize, 8);
 
     let mut buf2 = [0; 8];
@@ -603,15 +603,15 @@ fn test_send_vectored_with_ancillary_unix_datagram() {
     let bsock1 = or_panic!(UnixDatagram::bind(&path1));
     let bsock2 = or_panic!(UnixDatagram::bind(&path2));
 
-    let mut buf1 = [1; 8];
-    let mut bufs_send = &mut [IoSliceMut::new(&mut buf1[..])][..];
+    let buf1 = [1; 8];
+    let bufs_send = &[IoSlice::new(&buf1[..])][..];
 
     let mut ancillary1_buffer = [0; 128];
     let mut ancillary1 = SocketAncillary::new(&mut ancillary1_buffer[..]);
     assert!(ancillary1.add_fds(&[bsock1.as_raw_fd()][..]));
 
     or_panic!(bsock1.connect(&path2));
-    let usize = or_panic!(bsock1.send_vectored_with_ancillary(&mut bufs_send, &mut ancillary1));
+    let usize = or_panic!(bsock1.send_vectored_with_ancillary(&bufs_send, &mut ancillary1));
     assert_eq!(usize, 8);
 
     let mut buf2 = [0; 8];