Rollup of 7 pull requests

compiler/rustc_middle/src/ty/util.rs

@@ -699,7 +699,6 @@ impl<'tcx> ty::TyS<'tcx> {
     /// optimization as well as the rules around static values. Note
     /// that the `Freeze` trait is not exposed to end users and is
     /// effectively an implementation detail.
-    // FIXME: use `TyCtxtAt` instead of separate `Span`.
     pub fn is_freeze(&'tcx self, tcx_at: TyCtxtAt<'tcx>, param_env: ty::ParamEnv<'tcx>) -> bool {
         self.is_trivially_freeze() || tcx_at.is_freeze_raw(param_env.and(self))
     }

library/alloc/src/collections/binary_heap.rs

@@ -958,6 +958,27 @@ impl<T> BinaryHeap<T> {
         self.data.shrink_to(min_capacity)
     }
 
+    /// Returns a slice of all values in the underlying vector, in arbitrary
+    /// order.
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// #![feature(binary_heap_as_slice)]
+    /// use std::collections::BinaryHeap;
+    /// use std::io::{self, Write};
+    ///
+    /// let heap = BinaryHeap::from(vec![1, 2, 3, 4, 5, 6, 7]);
+    ///
+    /// io::sink().write(heap.as_slice()).unwrap();
+    /// ```
+    #[unstable(feature = "binary_heap_as_slice", issue = "83659")]
+    pub fn as_slice(&self) -> &[T] {
+        self.data.as_slice()
+    }
+
     /// Consumes the `BinaryHeap` and returns the underlying vector
     /// in arbitrary order.
     ///

library/alloc/tests/lib.rs

@@ -14,6 +14,7 @@
 #![feature(binary_heap_drain_sorted)]
 #![feature(slice_ptr_get)]
 #![feature(binary_heap_retain)]
+#![feature(binary_heap_as_slice)]
 #![feature(inplace_iteration)]
 #![feature(iter_map_while)]
 #![feature(vecdeque_binary_search)]

library/core/src/num/mod.rs

@@ -2,6 +2,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
+use crate::ascii;
 use crate::intrinsics;
 use crate::mem;
 use crate::str::FromStr;
@@ -661,6 +662,31 @@ impl u8 {
     pub const fn is_ascii_control(&self) -> bool {
         matches!(*self, b'\0'..=b'\x1F' | b'\x7F')
     }
+
+    /// Returns an iterator that produces an escaped version of a `u8`,
+    /// treating it as an ASCII character.
+    ///
+    /// The behavior is identical to [`ascii::escape_default`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(inherent_ascii_escape)]
+    ///
+    /// assert_eq!("0", b'0'.escape_ascii().to_string());
+    /// assert_eq!("\\t", b'\t'.escape_ascii().to_string());
+    /// assert_eq!("\\r", b'\r'.escape_ascii().to_string());
+    /// assert_eq!("\\n", b'\n'.escape_ascii().to_string());
+    /// assert_eq!("\\'", b'\''.escape_ascii().to_string());
+    /// assert_eq!("\\\"", b'"'.escape_ascii().to_string());
+    /// assert_eq!("\\\\", b'\\'.escape_ascii().to_string());
+    /// assert_eq!("\\x9d", b'\x9d'.escape_ascii().to_string());
+    /// ```
+    #[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+    #[inline]
+    pub fn escape_ascii(&self) -> ascii::EscapeDefault {
+        ascii::escape_default(*self)
+    }
 }
 
 #[lang = "u16"]

library/core/src/slice/ascii.rs

@@ -1,7 +1,10 @@
 //! Operations on ASCII `[u8]`.
 
+use crate::ascii;
+use crate::fmt::{self, Write};
 use crate::iter;
 use crate::mem;
+use crate::ops;
 
 #[lang = "slice_u8"]
 #[cfg(not(test))]
@@ -56,6 +59,95 @@ impl [u8] {
             byte.make_ascii_lowercase();
         }
     }
+
+    /// Returns an iterator that produces an escaped version of this slice,
+    /// treating it as an ASCII string.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(inherent_ascii_escape)]
+    ///
+    /// let s = b"0\t\r\n'\"\\\x9d";
+    /// let escaped = s.escape_ascii().to_string();
+    /// assert_eq!(escaped, "0\\t\\r\\n\\'\\\"\\\\\\x9d");
+    /// ```
+    #[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+    pub fn escape_ascii(&self) -> EscapeAscii<'_> {
+        EscapeAscii { inner: self.iter().flat_map(EscapeByte) }
+    }
+}
+
+impl_fn_for_zst! {
+    #[derive(Clone)]
+    struct EscapeByte impl Fn = |byte: &u8| -> ascii::EscapeDefault {
+        ascii::escape_default(*byte)
+    };
+}
+
+/// An iterator over the escaped version of a byte slice.
+///
+/// This `struct` is created by the [`slice::escape_ascii`] method. See its
+/// documentation for more information.
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+#[derive(Clone)]
+pub struct EscapeAscii<'a> {
+    inner: iter::FlatMap<super::Iter<'a, u8>, ascii::EscapeDefault, EscapeByte>,
+}
+
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> iter::Iterator for EscapeAscii<'a> {
+    type Item = u8;
+    #[inline]
+    fn next(&mut self) -> Option<u8> {
+        self.inner.next()
+    }
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.inner.size_hint()
+    }
+    #[inline]
+    fn try_fold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R
+    where
+        Fold: FnMut(Acc, Self::Item) -> R,
+        R: ops::Try<Ok = Acc>,
+    {
+        self.inner.try_fold(init, fold)
+    }
+    #[inline]
+    fn fold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc
+    where
+        Fold: FnMut(Acc, Self::Item) -> Acc,
+    {
+        self.inner.fold(init, fold)
+    }
+    #[inline]
+    fn last(mut self) -> Option<u8> {
+        self.next_back()
+    }
+}
+
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> iter::DoubleEndedIterator for EscapeAscii<'a> {
+    fn next_back(&mut self) -> Option<u8> {
+        self.inner.next_back()
+    }
+}
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> iter::ExactSizeIterator for EscapeAscii<'a> {}
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> iter::FusedIterator for EscapeAscii<'a> {}
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> fmt::Display for EscapeAscii<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.clone().try_for_each(|b| f.write_char(b as char))
+    }
+}
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+impl<'a> fmt::Debug for EscapeAscii<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.pad("EscapeAscii { .. }")
+    }
 }
 
 /// Returns `true` if any byte in the word `v` is nonascii (>= 128). Snarfed

library/core/src/slice/mod.rs

@@ -81,6 +81,9 @@ pub use index::SliceIndex;
 #[unstable(feature = "slice_range", issue = "76393")]
 pub use index::range;
 
+#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+pub use ascii::EscapeAscii;
+
 #[lang = "slice"]
 #[cfg(not(test))]
 impl<T> [T] {

library/std/src/sys/unix/ext/net/ancillary.rs

@@ -5,9 +5,7 @@ use crate::marker::PhantomData;
 use crate::mem::{size_of, zeroed};
 use crate::os::unix::io::RawFd;
 use crate::path::Path;
-#[cfg(target_os = "android")]
-use crate::ptr::eq;
-use crate::ptr::read_unaligned;
+use crate::ptr::{eq, read_unaligned};
 use crate::slice::from_raw_parts;
 use crate::sys::net::Socket;
 
@@ -30,12 +28,10 @@ pub(super) fn recv_vectored_with_ancillary_from(
 ) -> io::Result<(usize, bool, io::Result<SocketAddr>)> {
     unsafe {
         let mut msg_name: libc::sockaddr_un = zeroed();
-
         let mut msg: libc::msghdr = zeroed();
         msg.msg_name = &mut msg_name as *mut _ as *mut _;
         msg.msg_namelen = size_of::<libc::sockaddr_un>() as libc::socklen_t;
         msg.msg_iov = bufs.as_mut_ptr().cast();
-        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")))] {
                 msg.msg_iovlen = bufs.len() as libc::size_t;
@@ -45,13 +41,18 @@ pub(super) fn recv_vectored_with_ancillary_from(
                           target_os = "emscripten",
                           target_os = "freebsd",
                           all(target_os = "linux", target_env = "musl",),
+                          target_os = "macos",
                           target_os = "netbsd",
                           target_os = "openbsd",
                       ))] {
                 msg.msg_iovlen = bufs.len() as libc::c_int;
                 msg.msg_controllen = ancillary.buffer.len() as libc::socklen_t;
             }
         }
+        // macos requires that the control pointer is NULL when the len is 0.
+        if msg.msg_controllen > 0 {
+            msg.msg_control = ancillary.buffer.as_mut_ptr().cast();
+        }
 
         let count = socket.recv_msg(&mut msg)?;
 
@@ -79,7 +80,6 @@ pub(super) fn send_vectored_with_ancillary_to(
         msg.msg_name = &mut msg_name as *mut _ as *mut _;
         msg.msg_namelen = msg_namelen;
         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")))] {
                 msg.msg_iovlen = bufs.len() as libc::size_t;
@@ -89,13 +89,18 @@ pub(super) fn send_vectored_with_ancillary_to(
                           target_os = "emscripten",
                           target_os = "freebsd",
                           all(target_os = "linux", target_env = "musl",),
+                          target_os = "macos",
                           target_os = "netbsd",
                           target_os = "openbsd",
                       ))] {
                 msg.msg_iovlen = bufs.len() as libc::c_int;
                 msg.msg_controllen = ancillary.length as libc::socklen_t;
             }
         }
+        // macos requires that the control pointer is NULL when the len is 0.
+        if msg.msg_controllen > 0 {
+            msg.msg_control = ancillary.buffer.as_mut_ptr().cast();
+        }
 
         ancillary.truncated = false;
 
@@ -147,6 +152,7 @@ fn add_to_ancillary_data<T>(
                           target_os = "emscripten",
                           target_os = "freebsd",
                           all(target_os = "linux", target_env = "musl",),
+                          target_os = "macos",
                           target_os = "netbsd",
                           target_os = "openbsd",
                       ))] {
@@ -159,14 +165,12 @@ fn add_to_ancillary_data<T>(
         while !cmsg.is_null() {
             previous_cmsg = cmsg;
             cmsg = libc::CMSG_NXTHDR(&msg, cmsg);
-            cfg_if::cfg_if! {
-                // Android return the same pointer if it is the last cmsg.
-                // Therefore, check it if the previous pointer is the same as the current one.
-                if #[cfg(target_os = "android")] {
-                    if cmsg == previous_cmsg {
-                        break;
-                    }
-                }
+
+            // Most operating systems, but not Linux or emscripten, return the previous pointer
+            // when its length is zero. Therefore, check if the previous pointer is the same as
+            // the current one.
+            if eq(cmsg, previous_cmsg) {
+                break;
             }
         }
 
@@ -184,6 +188,7 @@ fn add_to_ancillary_data<T>(
                           target_os = "emscripten",
                           target_os = "freebsd",
                           all(target_os = "linux", target_env = "musl",),
+                          target_os = "macos",
                           target_os = "netbsd",
                           target_os = "openbsd",
                       ))] {
@@ -371,6 +376,7 @@ impl<'a> AncillaryData<'a> {
                               target_os = "emscripten",
                               target_os = "freebsd",
                               all(target_os = "linux", target_env = "musl",),
+                              target_os = "macos",
                               target_os = "netbsd",
                               target_os = "openbsd",
                           ))] {
@@ -421,6 +427,7 @@ impl<'a> Iterator for Messages<'a> {
                               target_os = "emscripten",
                               target_os = "freebsd",
                               all(target_os = "linux", target_env = "musl",),
+                              target_os = "macos",
                               target_os = "netbsd",
                               target_os = "openbsd",
                           ))] {
@@ -435,15 +442,13 @@ impl<'a> Iterator for Messages<'a> {
             };
 
             let cmsg = cmsg.as_ref()?;
-            cfg_if::cfg_if! {
-                // Android return the same pointer if it is the last cmsg.
-                // Therefore, check it if the previous pointer is the same as the current one.
-                if #[cfg(target_os = "android")] {
-                    if let Some(current) = self.current {
-                        if eq(current, cmsg) {
-                            return None;
-                        }
-                    }
+
+            // Most operating systems, but not Linux or emscripten, return the previous pointer
+            // when its length is zero. Therefore, check if the previous pointer is the same as
+            // the current one.
+            if let Some(current) = self.current {
+                if eq(current, cmsg) {
+                    return None;
                 }
             }
 
@@ -514,6 +519,12 @@ impl<'a> SocketAncillary<'a> {
         self.buffer.len()
     }
 
+    /// Returns `true` if the ancillary data is empty.
+    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    pub fn is_empty(&self) -> bool {
+        self.length == 0
+    }
+
     /// Returns the number of used bytes.
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn len(&self) -> usize {

src/librustdoc/html/markdown.rs

@@ -1162,6 +1162,7 @@ crate fn plain_text_summary(md: &str) -> String {
     s
 }
 
+#[derive(Debug)]
 crate struct MarkdownLink {
     pub kind: LinkType,
     pub link: String,