Merge pull request #742 from ojeda/rust-1.60

rust: upgrade to Rust 1.60

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ on:
 jobs:
   ci:
     runs-on: ubuntu-20.04
-    container: ghcr.io/rust-for-linux/ci:Rust-1.59.0
+    container: ghcr.io/rust-for-linux/ci:Rust-1.60.0
     timeout-minutes: 20
 
     strategy:

Documentation/process/changes.rst

@@ -31,7 +31,7 @@ you probably needn't concern yourself with pcmciautils.
 ====================== ===============  ========================================
 GNU C                  5.1              gcc --version
 Clang/LLVM (optional)  11.0.0           clang --version
-Rust (optional)        1.59.0           rustc --version
+Rust (optional)        1.60.0           rustc --version
 bindgen (optional)     0.56.0           bindgen --version
 GNU make               3.81             make --version
 binutils               2.23             ld -v

rust/Makefile

@@ -348,8 +348,8 @@ rust-analyzer:
 		$(RUST_LIB_SRC) > $(objtree)/rust-project.json
 
 $(obj)/core.o: private skip_clippy = 1
-$(obj)/core.o: private skip_flags = -Dunreachable_pub --edition=2021
-$(obj)/core.o: private rustc_target_flags = $(core-cfgs) --edition=2018
+$(obj)/core.o: private skip_flags = -Dunreachable_pub
+$(obj)/core.o: private rustc_target_flags = $(core-cfgs)
 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs $(obj)/target.json FORCE
 	$(call if_changed_dep,rustc_library)
 

rust/alloc/alloc.rs

@@ -350,7 +350,6 @@ extern "Rust" {
     // This is the magic symbol to call the global alloc error handler.  rustc generates
     // it to call `__rg_oom` if there is a `#[alloc_error_handler]`, or to call the
     // default implementations below (`__rdl_oom`) otherwise.
-    #[rustc_allocator_nounwind]
     fn __rust_alloc_error_handler(size: usize, align: usize) -> !;
 }
 
@@ -369,7 +368,6 @@ extern "Rust" {
 #[stable(feature = "global_alloc", since = "1.28.0")]
 #[rustc_const_unstable(feature = "const_alloc_error", issue = "92523")]
 #[cfg(all(not(no_global_oom_handling), not(test)))]
-#[rustc_allocator_nounwind]
 #[cold]
 pub const fn handle_alloc_error(layout: Layout) -> ! {
     const fn ct_error(_: Layout) -> ! {
@@ -400,13 +398,13 @@ pub mod __alloc_error_handler {
 
     // if there is no `#[alloc_error_handler]`
     #[rustc_std_internal_symbol]
-    pub unsafe extern "C" fn __rdl_oom(size: usize, _align: usize) -> ! {
+    pub unsafe extern "C-unwind" fn __rdl_oom(size: usize, _align: usize) -> ! {
         panic!("memory allocation of {} bytes failed", size)
     }
 
     // if there is an `#[alloc_error_handler]`
     #[rustc_std_internal_symbol]
-    pub unsafe extern "C" fn __rg_oom(size: usize, align: usize) -> ! {
+    pub unsafe extern "C-unwind" fn __rg_oom(size: usize, align: usize) -> ! {
         let layout = unsafe { Layout::from_size_align_unchecked(size, align) };
         extern "Rust" {
             #[lang = "oom"]

rust/alloc/boxed.rs

@@ -135,6 +135,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use core::any::Any;
+use core::async_iter::AsyncIterator;
 use core::borrow;
 use core::cmp::Ordering;
 use core::convert::{From, TryFrom};
@@ -151,7 +152,6 @@ use core::ops::{
 };
 use core::pin::Pin;
 use core::ptr::{self, Unique};
-use core::stream::Stream;
 use core::task::{Context, Poll};
 
 #[cfg(not(no_global_oom_handling))]
@@ -1172,8 +1172,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-unsafe impl<#[may_dangle] T: ?Sized, A: Allocator> const Drop for Box<T, A> {
+unsafe impl<#[may_dangle] T: ?Sized, A: Allocator> Drop for Box<T, A> {
     fn drop(&mut self) {
         // FIXME: Do nothing, drop is currently performed by compiler.
     }
@@ -1994,8 +1993,8 @@ where
     }
 }
 
-#[unstable(feature = "async_stream", issue = "79024")]
-impl<S: ?Sized + Stream + Unpin> Stream for Box<S> {
+#[unstable(feature = "async_iterator", issue = "79024")]
+impl<S: ?Sized + AsyncIterator + Unpin> AsyncIterator for Box<S> {
     type Item = S::Item;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {

rust/alloc/collections/mod.rs

@@ -16,15 +16,15 @@ pub mod vec_deque;
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub mod btree_map {
-    //! A map based on a B-Tree.
+    //! An ordered map based on a B-Tree.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::btree::map::*;
 }
 
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub mod btree_set {
-    //! A set based on a B-Tree.
+    //! An ordered set based on a B-Tree.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::btree::set::*;
 }

rust/alloc/fmt.rs

@@ -76,7 +76,7 @@
 //! identifier '=' expression
 //! ```
 //!
-//! For example, the following [`format!`] expressions all use named argument:
+//! For example, the following [`format!`] expressions all use named arguments:
 //!
 //! ```
 //! format!("{argument}", argument = "test");   // => "test"

rust/alloc/lib.rs

@@ -69,17 +69,14 @@
     issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
     test(no_crate_inject, attr(allow(unused_variables), deny(warnings)))
 )]
-#![cfg_attr(
-    not(bootstrap),
-    doc(cfg_hide(
-        not(test),
-        not(any(test, bootstrap)),
-        any(not(feature = "miri-test-libstd"), test, doctest),
-        no_global_oom_handling,
-        not(no_global_oom_handling),
-        target_has_atomic = "ptr"
-    ))
-)]
+#![doc(cfg_hide(
+    not(test),
+    not(any(test, bootstrap)),
+    any(not(feature = "miri-test-libstd"), test, doctest),
+    no_global_oom_handling,
+    not(no_global_oom_handling),
+    target_has_atomic = "ptr"
+))]
 #![no_std]
 #![needs_allocator]
 //
@@ -96,7 +93,7 @@
 #![feature(array_chunks)]
 #![feature(array_methods)]
 #![feature(array_windows)]
-#![feature(async_stream)]
+#![feature(async_iterator)]
 #![feature(coerce_unsized)]
 #![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]
 #![feature(const_box)]
@@ -117,11 +114,9 @@
 #![feature(extend_one)]
 #![feature(fmt_internals)]
 #![feature(fn_traits)]
-#![feature(inherent_ascii_escape)]
 #![feature(inplace_iteration)]
 #![feature(iter_advance_by)]
 #![feature(layout_for_ptr)]
-#![feature(maybe_uninit_extra)]
 #![feature(maybe_uninit_slice)]
 #![cfg_attr(test, feature(new_uninit))]
 #![feature(nonnull_slice_from_raw_parts)]
@@ -146,15 +141,14 @@
 #![feature(associated_type_bounds)]
 #![feature(box_syntax)]
 #![feature(cfg_sanitize)]
-#![feature(cfg_target_has_atomic)]
+#![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
 #![feature(const_deref)]
 #![feature(const_fn_trait_bound)]
 #![feature(const_mut_refs)]
 #![feature(const_ptr_write)]
 #![feature(const_precise_live_drops)]
 #![feature(const_trait_impl)]
 #![feature(const_try)]
-#![cfg_attr(bootstrap, feature(destructuring_assignment))]
 #![feature(dropck_eyepatch)]
 #![feature(exclusive_range_pattern)]
 #![feature(fundamental)]
@@ -170,6 +164,7 @@
 #![cfg_attr(test, feature(test))]
 #![feature(unboxed_closures)]
 #![feature(unsized_fn_params)]
+#![feature(c_unwind)]
 //
 // Rustdoc features:
 #![feature(doc_cfg)]

rust/alloc/macros.rs

@@ -39,6 +39,7 @@
 #[cfg(all(not(no_global_oom_handling), not(test)))]
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_diagnostic_item = "vec_macro"]
 #[allow_internal_unstable(box_syntax, liballoc_internals)]
 macro_rules! vec {
     () => (

rust/alloc/raw_vec.rs

@@ -110,7 +110,7 @@ impl<T, A: Allocator> RawVec<T, A> {
     //   to round up a request of less than 8 bytes to at least 8 bytes.
     // - 4 if elements are moderate-sized (<= 1 KiB).
     // - 1 otherwise, to avoid wasting too much space for very short Vecs.
-    const MIN_NON_ZERO_CAP: usize = if mem::size_of::<T>() == 1 {
+    pub(crate) const MIN_NON_ZERO_CAP: usize = if mem::size_of::<T>() == 1 {
         8
     } else if mem::size_of::<T>() <= 1024 {
         4
@@ -341,6 +341,12 @@ impl<T, A: Allocator> RawVec<T, A> {
         }
     }
 
+    /// The same as `reserve_for_push`, but returns on errors instead of panicking or aborting.
+    #[inline(never)]
+    pub fn try_reserve_for_push(&mut self, len: usize) -> Result<(), TryReserveError> {
+        self.grow_amortized(len, 1)
+    }
+
     /// Ensures that the buffer contains at least enough space to hold `len +
     /// additional` elements. If it doesn't already, will reallocate the
     /// minimum possible amount of memory necessary. Generally this will be

rust/alloc/slice.rs

@@ -110,7 +110,7 @@ pub use core::slice::ArrayChunks;
 pub use core::slice::ArrayChunksMut;
 #[unstable(feature = "array_windows", issue = "75027")]
 pub use core::slice::ArrayWindows;
-#[unstable(feature = "inherent_ascii_escape", issue = "77174")]
+#[stable(feature = "inherent_ascii_escape", since = "1.60.0")]
 pub use core::slice::EscapeAscii;
 #[stable(feature = "slice_get_slice", since = "1.28.0")]
 pub use core::slice::SliceIndex;
@@ -425,7 +425,10 @@ impl<T> [T] {
 
     /// Sorts the slice with a key extraction function.
     ///
-    /// During sorting, the key function is called only once per element.
+    /// During sorting, the key function is called at most once per element, by using
+    /// temporary storage to remember the results of key evaluation.
+    /// The order of calls to the key function is unspecified and may change in future versions
+    /// of the standard library.
     ///
     /// This sort is stable (i.e., does not reorder equal elements) and *O*(*m* \* *n* + *n* \* log(*n*))
     /// worst-case, where the key function is *O*(*m*).

rust/alloc/string.rs

@@ -1630,17 +1630,24 @@ impl String {
         self.vec.clear()
     }
 
-    /// Creates a draining iterator that removes the specified range in the `String`
-    /// and yields the removed `chars`.
+    /// Removes the specified range from the string in bulk, returning all
+    /// removed characters as an iterator.
     ///
-    /// Note: The element range is removed even if the iterator is not
-    /// consumed until the end.
+    /// The returned iterator keeps a mutable borrow on the string to optimize
+    /// its implementation.
     ///
     /// # Panics
     ///
     /// Panics if the starting point or end point do not lie on a [`char`]
     /// boundary, or if they're out of bounds.
     ///
+    /// # Leaking
+    ///
+    /// If the returned iterator goes out of scope without being dropped (due to
+    /// [`core::mem::forget`], for example), the string may still contain a copy
+    /// of any drained characters, or may have lost characters arbitrarily,
+    /// including characters outside the range.
+    ///
     /// # Examples
     ///
     /// Basic usage:
@@ -1654,7 +1661,7 @@ impl String {
     /// assert_eq!(t, "α is alpha, ");
     /// assert_eq!(s, "β is beta");
     ///
-    /// // A full range clears the string
+    /// // A full range clears the string, like `clear()` does
     /// s.drain(..);
     /// assert_eq!(s, "");
     /// ```

rust/alloc/vec/into_iter.rs

@@ -127,7 +127,7 @@ impl<T, A: Allocator> AsRef<[T]> for IntoIter<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 unsafe impl<T: Send, A: Allocator + Send> Send for IntoIter<T, A> {}
 #[stable(feature = "rust1", since = "1.0.0")]
-unsafe impl<T: Sync, A: Allocator> Sync for IntoIter<T, A> {}
+unsafe impl<T: Sync, A: Allocator + Sync> Sync for IntoIter<T, A> {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T, A: Allocator> Iterator for IntoIter<T, A> {