rust-lang · bors · Jul 5, 2021 · Mar 27, 2021 · Jun 28, 2021 · Jun 30, 2021
diff --git a/compiler/rustc_middle/src/mir/interpret/allocation.rs b/compiler/rustc_middle/src/mir/interpret/allocation.rs
@@ -361,6 +361,8 @@ impl<Tag: Copy, Extra> Allocation<Tag, Extra> {
         range: AllocRange,
         val: ScalarMaybeUninit<Tag>,
     ) -> AllocResult {
+        assert!(self.mutability == Mutability::Mut);
+
         let val = match val {
             ScalarMaybeUninit::Scalar(scalar) => scalar,
             ScalarMaybeUninit::Uninit => {
@@ -484,6 +486,7 @@ impl<Tag: Copy, Extra> Allocation<Tag, Extra> {
         if range.size.bytes() == 0 {
             return;
         }
+        assert!(self.mutability == Mutability::Mut);
         self.init_mask.set_range(range.start, range.end(), is_init);
     }
 }

diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
@@ -187,8 +187,6 @@ impl<T> Box<T> {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline(always)]
-    #[doc(alias = "alloc")]
-    #[doc(alias = "malloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new(x: T) -> Self {
         box x
@@ -239,7 +237,6 @@ impl<T> Box<T> {
     /// [zeroed]: mem::MaybeUninit::zeroed
     #[cfg(not(no_global_oom_handling))]
     #[inline]
-    #[doc(alias = "calloc")]
     #[unstable(feature = "new_uninit", issue = "63291")]
     pub fn new_zeroed() -> Box<mem::MaybeUninit<T>> {
         Self::new_zeroed_in(Global)

diff --git a/library/alloc/src/collections/binary_heap.rs b/library/alloc/src/collections/binary_heap.rs
@@ -1034,7 +1034,6 @@ impl<T> BinaryHeap<T> {
     ///
     /// assert_eq!(heap.len(), 2);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         self.data.len()

diff --git a/library/alloc/src/collections/btree/map.rs b/library/alloc/src/collections/btree/map.rs
@@ -889,7 +889,6 @@ impl<K, V> BTreeMap<K, V> {
     /// assert_eq!(map.remove(&1), Some("a"));
     /// assert_eq!(map.remove(&1), None);
     /// ```
-    #[doc(alias = "delete")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V>
     where
@@ -2165,7 +2164,6 @@ impl<K, V> BTreeMap<K, V> {
     /// a.insert(1, "a");
     /// assert_eq!(a.len(), 1);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_btree_new", issue = "71835")]
     pub const fn len(&self) -> usize {

diff --git a/library/alloc/src/collections/btree/set.rs b/library/alloc/src/collections/btree/set.rs
@@ -810,7 +810,6 @@ impl<T> BTreeSet<T> {
     /// assert_eq!(set.remove(&2), true);
     /// assert_eq!(set.remove(&2), false);
     /// ```
-    #[doc(alias = "delete")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn remove<Q: ?Sized>(&mut self, value: &Q) -> bool
     where
@@ -1021,7 +1020,6 @@ impl<T> BTreeSet<T> {
     /// v.insert(1);
     /// assert_eq!(v.len(), 1);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_unstable(feature = "const_btree_new", issue = "71835")]
     pub const fn len(&self) -> usize {

diff --git a/library/alloc/src/collections/linked_list.rs b/library/alloc/src/collections/linked_list.rs
@@ -586,7 +586,6 @@ impl<T> LinkedList<T> {
     /// dl.push_back(3);
     /// assert_eq!(dl.len(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {

diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs
@@ -1036,7 +1036,6 @@ impl<T> VecDeque<T> {
     /// v.push_back(1);
     /// assert_eq!(v.len(), 1);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         count(self.tail, self.head, self.cap())

diff --git a/library/alloc/src/macros.rs b/library/alloc/src/macros.rs
@@ -35,8 +35,6 @@
 ///
 /// [`Vec`]: crate::vec::Vec
 #[cfg(not(test))]
-#[doc(alias = "alloc")]
-#[doc(alias = "malloc")]
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[allow_internal_unstable(box_syntax, liballoc_internals)]

diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
@@ -419,8 +419,6 @@ impl String {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline]
-    #[doc(alias = "alloc")]
-    #[doc(alias = "malloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn with_capacity(capacity: usize) -> String {
         String { vec: Vec::with_capacity(capacity) }
@@ -1534,7 +1532,6 @@ impl String {
     /// assert_eq!(fancy_f.len(), 4);
     /// assert_eq!(fancy_f.chars().count(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {

diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
@@ -459,7 +459,6 @@ impl<T> Vec<T> {
     /// ```
     #[cfg(not(no_global_oom_handling))]
     #[inline]
-    #[doc(alias = "malloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn with_capacity(capacity: usize) -> Self {
         Self::with_capacity_in(capacity, Global)
@@ -799,7 +798,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// assert!(vec.capacity() >= 11);
     /// ```
     #[cfg(not(no_global_oom_handling))]
-    #[doc(alias = "realloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn reserve(&mut self, additional: usize) {
         self.buf.reserve(self.len, additional);
@@ -826,7 +824,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// assert!(vec.capacity() >= 11);
     /// ```
     #[cfg(not(no_global_oom_handling))]
-    #[doc(alias = "realloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn reserve_exact(&mut self, additional: usize) {
         self.buf.reserve_exact(self.len, additional);
@@ -864,7 +861,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// }
     /// # process_data(&[1, 2, 3]).expect("why is the test harness OOMing on 12 bytes?");
     /// ```
-    #[doc(alias = "realloc")]
     #[unstable(feature = "try_reserve", reason = "new API", issue = "48043")]
     pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError> {
         self.buf.try_reserve(self.len, additional)
@@ -906,7 +902,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// }
     /// # process_data(&[1, 2, 3]).expect("why is the test harness OOMing on 12 bytes?");
     /// ```
-    #[doc(alias = "realloc")]
     #[unstable(feature = "try_reserve", reason = "new API", issue = "48043")]
     pub fn try_reserve_exact(&mut self, additional: usize) -> Result<(), TryReserveError> {
         self.buf.try_reserve_exact(self.len, additional)
@@ -927,7 +922,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// assert!(vec.capacity() >= 3);
     /// ```
     #[cfg(not(no_global_oom_handling))]
-    #[doc(alias = "realloc")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn shrink_to_fit(&mut self) {
         // The capacity is never less than the length, and there's nothing to do when
@@ -958,7 +952,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// assert!(vec.capacity() >= 3);
     /// ```
     #[cfg(not(no_global_oom_handling))]
-    #[doc(alias = "realloc")]
     #[unstable(feature = "shrink_to", reason = "new API", issue = "56431")]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         if self.capacity() > min_capacity {
@@ -1820,7 +1813,6 @@ impl<T, A: Allocator> Vec<T, A> {
     /// let a = vec![1, 2, 3];
     /// assert_eq!(a.len(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {

diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs
@@ -717,8 +717,14 @@ extern "rust-intrinsic" {
     /// Therefore, implementations must not require the user to uphold
     /// any safety invariants.
     ///
-    /// A more user-friendly and stable version of this operation is
-    /// [`std::process::abort`](../../std/process/fn.abort.html).
+    /// [`std::process::abort`](../../std/process/fn.abort.html) is to be preferred if possible,
+    /// as its behavior is more user-friendly and more stable.
+    ///
+    /// The current implementation of `intrinsics::abort` is to invoke an invalid instruction,
+    /// on most platforms.
+    /// On Unix, the
+    /// process will probably terminate with a signal like `SIGABRT`, `SIGILL`, `SIGTRAP`, `SIGSEGV` or
+    /// `SIGBUS`.  The precise behaviour is not guaranteed and not stable.
     pub fn abort() -> !;
 
     /// Informs the optimizer that this point in the code is not reachable,

diff --git a/library/core/src/iter/traits/exact_size.rs b/library/core/src/iter/traits/exact_size.rs
@@ -97,7 +97,6 @@ pub trait ExactSizeIterator: Iterator {
     ///
     /// assert_eq!(5, five.len());
     /// ```
-    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn len(&self) -> usize {

diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
@@ -95,7 +95,6 @@ impl<T> [T] {
     /// let a = [1, 2, 3];
     /// assert_eq!(a.len(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[cfg_attr(not(bootstrap), lang = "slice_len_fn")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_stable(feature = "const_slice_len", since = "1.39.0")]

diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
@@ -138,7 +138,6 @@ impl str {
     /// assert_eq!("ƒoo".len(), 4); // fancy f!
     /// assert_eq!("ƒoo".chars().count(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[rustc_const_stable(feature = "const_str_len", since = "1.39.0")]
     #[inline]

diff --git a/library/std/src/collections/hash/map.rs b/library/std/src/collections/hash/map.rs
@@ -454,7 +454,6 @@ impl<K, V, S> HashMap<K, V, S> {
     /// a.insert(1, "a");
     /// assert_eq!(a.len(), 1);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
         self.base.len()
@@ -893,7 +892,6 @@ where
     /// assert_eq!(map.remove(&1), Some("a"));
     /// assert_eq!(map.remove(&1), None);
     /// ```
-    #[doc(alias = "delete")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn remove<Q: ?Sized>(&mut self, k: &Q) -> Option<V>

diff --git a/library/std/src/collections/hash/set.rs b/library/std/src/collections/hash/set.rs
@@ -202,7 +202,6 @@ impl<T, S> HashSet<T, S> {
     /// v.insert(1);
     /// assert_eq!(v.len(), 1);
     /// ```
-    #[doc(alias = "length")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn len(&self) -> usize {
@@ -875,7 +874,6 @@ where
     /// assert_eq!(set.remove(&2), true);
     /// assert_eq!(set.remove(&2), false);
     /// ```
-    #[doc(alias = "delete")]
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn remove<Q: ?Sized>(&mut self, value: &Q) -> bool

diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
@@ -694,7 +694,6 @@ impl OsStr {
     /// let os_str = OsStr::new("foo");
     /// assert_eq!(os_str.len(), 3);
     /// ```
-    #[doc(alias = "length")]
     #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
     #[inline]
     pub fn len(&self) -> usize {

diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
@@ -1551,7 +1551,6 @@ impl AsInner<fs_imp::DirEntry> for DirEntry {
 ///     Ok(())
 /// }
 /// ```
-#[doc(alias = "delete")]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn remove_file<P: AsRef<Path>>(path: P) -> io::Result<()> {
     fs_imp::unlink(path.as_ref())
@@ -1986,7 +1985,6 @@ pub fn create_dir_all<P: AsRef<Path>>(path: P) -> io::Result<()> {
 ///     Ok(())
 /// }
 /// ```
-#[doc(alias = "delete")]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn remove_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
     fs_imp::rmdir(path.as_ref())
@@ -2024,7 +2022,6 @@ pub fn remove_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
 ///     Ok(())
 /// }
 /// ```
-#[doc(alias = "delete")]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub fn remove_dir_all<P: AsRef<Path>>(path: P) -> io::Result<()> {
     fs_imp::remove_dir_all(path.as_ref())

diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
@@ -1759,7 +1759,6 @@ pub trait Seek {
     /// # Example
     ///
     /// ```no_run
-    /// #![feature(seek_rewind)]
     /// use std::io::{Read, Seek, Write};
     /// use std::fs::OpenOptions;
     ///
@@ -1777,7 +1776,7 @@ pub trait Seek {
     /// f.read_to_string(&mut buf).unwrap();
     /// assert_eq!(&buf, hello);
     /// ```
-    #[unstable(feature = "seek_rewind", issue = "85149")]
+    #[stable(feature = "seek_rewind", since = "1.55.0")]
     fn rewind(&mut self) -> Result<()> {
         self.seek(SeekFrom::Start(0))?;
         Ok(())

diff --git a/library/std/src/io/tests.rs b/library/std/src/io/tests.rs
@@ -336,6 +336,10 @@ fn seek_position() -> io::Result<()> {
     assert_eq!(c.stream_position()?, 8);
     assert_eq!(c.stream_position()?, 8);
 
+    c.rewind()?;
+    assert_eq!(c.stream_position()?, 0);
+    assert_eq!(c.stream_position()?, 0);
+
     Ok(())
 }
 

diff --git a/library/std/src/os/unix/fs.rs b/library/std/src/os/unix/fs.rs
@@ -9,6 +9,8 @@ use crate::path::Path;
 use crate::sys;
 use crate::sys_common::{AsInner, AsInnerMut, FromInner};
 // Used for `File::read` on intra-doc links
+use crate::ffi::OsStr;
+use crate::sealed::Sealed;
 #[allow(unused_imports)]
 use io::{Read, Write};
 
@@ -839,6 +841,43 @@ impl DirEntryExt for fs::DirEntry {
     }
 }
 
+/// Sealed Unix-specific extension methods for [`fs::DirEntry`].
+#[unstable(feature = "dir_entry_ext2", issue = "85573")]
+pub trait DirEntryExt2: Sealed {
+    /// Returns a reference to the underlying `OsStr` of this entry's filename.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(dir_entry_ext2)]
+    /// use std::os::unix::fs::DirEntryExt2;
+    /// use std::{fs, io};
+    ///
+    /// fn main() -> io::Result<()> {
+    ///     let mut entries = fs::read_dir(".")?.collect::<Result<Vec<_>, io::Error>>()?;
+    ///     entries.sort_unstable_by(|a, b| a.file_name_ref().cmp(b.file_name_ref()));
+    ///
+    ///     for p in entries {
+    ///         println!("{:?}", p);
+    ///     }
+    ///
+    ///     Ok(())
+    /// }
+    /// ```
+    fn file_name_ref(&self) -> &OsStr;
+}
+
+/// Allows extension traits within `std`.
+#[unstable(feature = "sealed", issue = "none")]
+impl Sealed for fs::DirEntry {}
+
+#[unstable(feature = "dir_entry_ext2", issue = "85573")]
+impl DirEntryExt2 for fs::DirEntry {
+    fn file_name_ref(&self) -> &OsStr {
+        self.as_inner().file_name_os_str()
+    }
+}
+
 /// Creates a new symbolic link on the filesystem.
 ///
 /// The `link` path will be a symbolic link pointing to the `original` path.

diff --git a/library/std/src/process.rs b/library/std/src/process.rs
@@ -1898,6 +1898,9 @@ pub fn exit(code: i32) -> ! {
 /// process, no destructors on the current stack or any other thread's stack
 /// will be run.
 ///
+/// Rust IO buffers (eg, from `BufWriter`) will not be flushed.
+/// Likewise, C stdio buffers will (on most platforms) not be flushed.
+///
 /// This is in contrast to the default behaviour of [`panic!`] which unwinds
 /// the current thread's stack and calls all destructors.
 /// When `panic="abort"` is set, either as an argument to `rustc` or in a
@@ -1908,6 +1911,10 @@ pub fn exit(code: i32) -> ! {
 /// this function at a known point where there are no more destructors left
 /// to run.
 ///
+/// The process's termination will be similar to that from the C `abort()`
+/// function.  On Unix, the process will terminate with signal `SIGABRT`, which
+/// typically means that the shell prints "Aborted".
+///
 /// # Examples
 ///
 /// ```no_run

diff --git a/library/std/src/sys/unix/fs.rs b/library/std/src/sys/unix/fs.rs
@@ -647,6 +647,10 @@ impl DirEntry {
     fn name_bytes(&self) -> &[u8] {
         &*self.name
     }
+
+    pub fn file_name_os_str(&self) -> &OsStr {
+        OsStr::from_bytes(self.name_bytes())
+    }
 }
 
 impl OpenOptions {