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Add PhantomData marker for dropck to BTreeMap #99413

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merged 1 commit into from
Jul 21, 2022

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steffahn
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closes #99408

@rustbot rustbot added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jul 18, 2022
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r? @kennytm

(rust-highfive has picked a reviewer for you, use r? to override)

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rustbot commented Jul 18, 2022

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

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  • Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
  • Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
  • Changing public documentation in ways that create new stability guarantees
  • Changing observable runtime behavior of library APIs

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 18, 2022
@steffahn steffahn changed the title Add PhandomData marker for dropck to BTreeMap Add PhantomData marker for dropck to BTreeMap Jul 18, 2022
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Nice catch! ✅

Comment on lines +192 to +196
// FIXME: This implementation is "wrong", but changing it would be a breaking change.
// (The bounds of the automatic `UnwindSafe` implementation have been like this since Rust 1.50.)
// Maybe we can fix it nonetheless with a crater run, or if the `UnwindSafe`
// traits are deprecated, or disarmed (no longer causing hard errors) in the future.
#[stable(feature = "btree_unwindsafe", since = "1.64.0")]
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It might be worth just correcting (so, breaking) this. The damage is probably very small, if any.

@rust-lang/libs-api Opinions?

Comment on lines +181 to +182
// For dropck; the `Box` avoids making the `Unpin` impl more strict than before
_marker: PhantomData<crate::boxed::Box<(K, V)>>,
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I think this is yet another reminder for us that we need something more intuitive than PhantomData. PhantomData is used to control Send, Sync, dropck, UnwindSafe, UnwindSafeRef, variance, and Unpin. Possibly more (in the future). It happens so often that we try to control just some of these, and accidentally end up affecting one of the others too. (Like what would've happened here if (K, V) wasn't wrapped in a Box.)

cc @rust-lang/lang

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This reminds me of a crate that I wrote half a year ago. https://docs.rs/phtm/1.0.3/phtm/

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m-ou-se commented Jul 20, 2022

@bors r+

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bors commented Jul 20, 2022

📌 Commit 110fdb6 has been approved by m-ou-se

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 20, 2022
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Jul 21, 2022
Add `PhantomData` marker for dropck to `BTreeMap`

closes rust-lang#99408
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failed in rollup

@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 21, 2022
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steffahn commented Jul 21, 2022

@Dylan-DPC

(Assuming I'm looking at the right error message..) The error is something about a changed compile-test output regarding const generics, so I can only see one of the two const-generic PRs at fault.

This PR seems so unlikely to be the problem there that I'd appreciate some explanation why it was chosen to be un-accepted before I'd take any further action / rebasing / whatever.

@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 21, 2022
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m-ou-se commented Jul 21, 2022

@bors r+

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bors commented Jul 21, 2022

📌 Commit 110fdb6 has been approved by m-ou-se

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 21, 2022
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Jul 21, 2022
Add `PhantomData` marker for dropck to `BTreeMap`

closes rust-lang#99408
@rustbot rustbot added the T-release Relevant to the release subteam, which will review and decide on the PR/issue. label Jul 25, 2022
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👌 Experiment pr-99413 created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

@craterbot craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 25, 2022
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🚧 Experiment pr-99413 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

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@craterbot abort

c5df2f0 is not a bors merge commit, so we'll need to find a different commit to base this crater run on.

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🗑️ Experiment pr-99413 deleted!

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@craterbot craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Jul 30, 2022
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@craterbot run end=master#af7ab3447079fddc51c6c7749b160d24769f7c16 start=master#1673f1450eeaf4a5452e086db0fe2ae274a0144f mode=check-only

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👌 Experiment pr-99413 created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

@craterbot craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 30, 2022
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@craterbot edit p=1

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🚨 Error: failed to parse the command

🆘 If you have any trouble with Crater please ping @rust-lang/infra!
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@craterbot name=pr-99413 p=1

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📝 Configuration of the pr-99413 experiment changed.

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🚧 Experiment pr-99413 is now running

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🎉 Experiment pr-99413 is completed!
📊 322 regressed and 3 fixed (240198 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

@craterbot craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Aug 9, 2022
tmandry added a commit to joshtriplett/rust that referenced this pull request Sep 17, 2022
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Oct 11, 2022
Pkgsrc changes:
 * Add patch to fix vendor/kqueue issue (on 32-bit hosts)
 * Adjust other patches & line numbers
 * Version bumps & checksum changes.

Upstream changes:

Version 1.64.0 (2022-09-22)
===========================

Language
--------
- [Unions with mutable references or tuples of allowed types are
  now allowed](rust-lang/rust#97995)

- It is now considered valid to deallocate memory pointed to by a
  shared reference `&T` [if every byte in `T` is inside an
  `UnsafeCell`](rust-lang/rust#98017)

- Unused tuple struct fields are now warned against in an
  allow-by-default lint, [`unused_tuple_struct_fields`]
  (rust-lang/rust#95977), similar to the
  existing warning for unused struct fields. This lint will become
  warn-by-default in the future.

Compiler
--------
- [Add Nintendo Switch as tier 3 target]
  (rust-lang/rust#88991)
  - Refer to Rust's [platform support page][platform-support-doc] for more
    information on Rust's tiered platform support.
- [Only compile `#[used]` as llvm.compiler.used for ELF targets]
  (rust-lang/rust#93718)
- [Add the `--diagnostic-width` compiler flag to define the terminal width.]
  (rust-lang/rust#95635)
- [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS]
  (rust-lang/rust#98771)

Libraries
---------
- [Remove restrictions on compare-exchange memory ordering.]
  (rust-lang/rust#98383)
- You can now `write!` or `writeln!` into an `OsString`: [Implement
  `fmt::Write` for `OsString`](rust-lang/rust#97915)
- [Make RwLockReadGuard covariant]
  (rust-lang/rust#96820)
- [Implement `FusedIterator` for `std::net::[Into]Incoming`]
  (rust-lang/rust#97300)
- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`]
  (rust-lang/rust#97437)
- [`ptr::copy` and `ptr::swap` are doing untyped copies]
  (rust-lang/rust#97712)
- [Add cgroupv1 support to `available_parallelism`]
  (rust-lang/rust#97925)
- [Mitigate many incorrect uses of `mem::uninitialized`]
  (rust-lang/rust#99182)

Stabilized APIs
---------------
- [`future::IntoFuture`]
  (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
- [`future::poll_fn`]
  (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
- [`task::ready!`]
  (https://doc.rust-lang.org/stable/std/task/macro.ready.html)
- [`num::NonZero*::checked_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
- [`num::NonZero*::checked_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
- [`num::NonZero*::saturating_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
- [`num::NonZero*::saturating_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
- [`num::NonZeroI*::abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
- [`num::NonZeroI*::checked_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
- [`num::NonZeroI*::overflowing_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
- [`num::NonZeroI*::saturating_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
- [`num::NonZeroI*::unsigned_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
- [`num::NonZeroI*::wrapping_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
- [`num::NonZeroU*::checked_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
- [`num::NonZeroU*::checked_next_power_of_two`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
- [`num::NonZeroU*::saturating_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
- [`os::unix::process::CommandExt::process_group`]
  (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
- [`os::windows::fs::FileTypeExt::is_symlink_dir`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
- [`os::windows::fs::FileTypeExt::is_symlink_file`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)

These types were previously stable in `std::ffi`, but are now also
available in `core` and `alloc`:

- [`core::ffi::CStr`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
- [`core::ffi::FromBytesWithNulError`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
- [`alloc::ffi::CString`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
- [`alloc::ffi::FromVecWithNulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
- [`alloc::ffi::IntoStringError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
- [`alloc::ffi::NulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)

These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:

- [`ffi::c_char`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
- [`ffi::c_double`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
- [`ffi::c_float`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
- [`ffi::c_int`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
- [`ffi::c_long`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
- [`ffi::c_longlong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
- [`ffi::c_schar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
- [`ffi::c_short`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
- [`ffi::c_uchar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
- [`ffi::c_uint`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
- [`ffi::c_ulong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
- [`ffi::c_ulonglong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
- [`ffi::c_ushort`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)

These APIs are now usable in const contexts:

- [`slice::from_raw_parts`]
  (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)

Cargo
-----
- [Packages can now inherit settings from the workspace so that
  the settings can be centralized in one place.]
  (rust-lang/cargo#10859) See
  [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
  and
  [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
  for more details on how to define these common settings.
- [Cargo commands can now accept multiple `--target` flags to build
  for multiple targets at once]
  (rust-lang/cargo#10766), and the
  [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
  config option may now take an array of multiple targets.
- [The `--jobs` argument can now take a negative number to count
  backwards from the max CPUs.]
  (rust-lang/cargo#10844)
- [`cargo add` will now update `Cargo.lock`.]
  (rust-lang/cargo#10902)
- [Added](rust-lang/cargo#10838) the
  [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
  flag to `cargo rustc` to override the crate type.
- [Significantly improved the performance fetching git dependencies from GitHub
  when using a hash in the `rev` field.]
  (rust-lang/cargo#10079)

Misc
----
- [The `rust-analyzer` rustup component is now available on the stable channel.]
  (rust-lang/rust#98640)

Compatibility Notes
-------------------
- The minimum required versions for all `-linux-gnu` targets are
  now at least kernel 3.2 and glibc 2.17, for targets that previously
  supported older versions: [Increase the minimum linux-gnu
  versions](rust-lang/rust#95026)
- [Network primitives are now implemented with the ideal Rust
  layout, not the C system layout]
  (rust-lang/rust#78802). This can
  cause problems when transmuting the types.
- [Add assertion that `transmute_copy`'s `U` is not larger than `T`]
  (rust-lang/rust#98839)
- [A soundness bug in `BTreeMap` was fixed]
  (rust-lang/rust#99413) that allowed data
  it was borrowing to be dropped before the container.
- [The Drop behavior of C-like enums cast to ints has changed]
  (rust-lang/rust#96862). These are already
  discouraged by a compiler warning.
- [Relate late-bound closure lifetimes to parent fn in NLL]
  (rust-lang/rust#98835)
- [Errors at const-eval time are now in future incompatibility reports]
  (rust-lang/rust#97743)
- On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements
  were erroneously accepted if they used the high registers (r8 to
  r14) as an input/output operand. [This is no longer accepted]
  (rust-lang/rust#99155).
- [`impl Trait` was accidentally accepted as the associated type
  value of return-position `impl Trait`]
  (rust-lang/rust#97346), without
  fulfilling all the trait bounds of that associated type, as long
  as the hidden type satisfies said bounds. This has been fixed.

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- Windows builds now use profile-guided optimization, providing
  10-20% improvements to compiler performance: [Utilize PGO for
  windows x64 rustc dist builds]
  (rust-lang/rust#96978)
- [Stop keeping metadata in memory before writing it to disk]
  (rust-lang/rust#96544)
- [compiletest: strip debuginfo by default for mode=ui]
  (rust-lang/rust#98140)
- Many improvements to generated code for derives, including
  performance improvements:
  - [Don't use match-destructuring for derived ops on structs.]
    (rust-lang/rust#98446)
  - [Many small deriving cleanups]
    (rust-lang/rust#98741)
  - [More derive output improvements]
    (rust-lang/rust#98758)
  - [Clarify deriving code](rust-lang/rust#98915)
  - [Final derive output improvements]
    (rust-lang/rust#99046)
  - [Stop injecting `#[allow(unused_qualifications)]` in generated
    `derive` implementations](rust-lang/rust#99485)
  - [Improve `derive(Debug)`](rust-lang/rust#98190)
- [Bump to clap 3](rust-lang/rust#98213)
- [fully move dropck to mir](rust-lang/rust#98641)
- [Optimize `Vec::insert` for the case where `index == len`.]
  (rust-lang/rust#98755)
- [Convert rust-analyzer to an in-tree tool]
  (rust-lang/rust#99603)
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Nov 16, 2022
Pkgsrc changes:
 * This package now contains rust-analyzer, so implicitly
   conflicts with that pkgsrc package.  The same goes for
   the rust-src package.
 * Add NetBSD/arm6 port
 * Add unfinished NetBSD/mipsel port
 * Revert the use of the internal LLVM,
   should now build with the new pkgsrc LLVM (15).
 * Add depndence on compat80 for sparc64 to fix the build
 * Adapt patches
 * Add CHECK_INTERPRETER_SKIP for a few (mostly unused) files.
   (A proper fix may come later.)

Upstream changes:

Version 1.64.0 (2022-09-22)
===========================

Language
--------
- [Unions with mutable references or tuples of allowed types are
  now allowed](rust-lang/rust#97995)

- It is now considered valid to deallocate memory pointed to by a
  shared reference `&T` [if every byte in `T` is inside an
  `UnsafeCell`](rust-lang/rust#98017)

- Unused tuple struct fields are now warned against in an
  allow-by-default lint, [`unused_tuple_struct_fields`]
  (rust-lang/rust#95977), similar to the
  existing warning for unused struct fields. This lint will become
  warn-by-default in the future.

Compiler
--------
- [Add Nintendo Switch as tier 3 target]
  (rust-lang/rust#88991)
  - Refer to Rust's [platform support page][platform-support-doc] for more
    information on Rust's tiered platform support.
- [Only compile `#[used]` as llvm.compiler.used for ELF targets]
  (rust-lang/rust#93718)
- [Add the `--diagnostic-width` compiler flag to define the terminal width.]
  (rust-lang/rust#95635)
- [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS]
  (rust-lang/rust#98771)

Libraries
---------
- [Remove restrictions on compare-exchange memory ordering.]
  (rust-lang/rust#98383)
- You can now `write!` or `writeln!` into an `OsString`: [Implement
  `fmt::Write` for `OsString`](rust-lang/rust#97915)
- [Make RwLockReadGuard covariant]
  (rust-lang/rust#96820)
- [Implement `FusedIterator` for `std::net::[Into]Incoming`]
  (rust-lang/rust#97300)
- [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`]
  (rust-lang/rust#97437)
- [`ptr::copy` and `ptr::swap` are doing untyped copies]
  (rust-lang/rust#97712)
- [Add cgroupv1 support to `available_parallelism`]
  (rust-lang/rust#97925)
- [Mitigate many incorrect uses of `mem::uninitialized`]
  (rust-lang/rust#99182)

Stabilized APIs
---------------
- [`future::IntoFuture`]
  (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
- [`future::poll_fn`]
  (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
- [`task::ready!`]
  (https://doc.rust-lang.org/stable/std/task/macro.ready.html)
- [`num::NonZero*::checked_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
- [`num::NonZero*::checked_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
- [`num::NonZero*::saturating_mul`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
- [`num::NonZero*::saturating_pow`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
- [`num::NonZeroI*::abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
- [`num::NonZeroI*::checked_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
- [`num::NonZeroI*::overflowing_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
- [`num::NonZeroI*::saturating_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
- [`num::NonZeroI*::unsigned_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
- [`num::NonZeroI*::wrapping_abs`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
- [`num::NonZeroU*::checked_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
- [`num::NonZeroU*::checked_next_power_of_two`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
- [`num::NonZeroU*::saturating_add`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
- [`os::unix::process::CommandExt::process_group`]
  (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
- [`os::windows::fs::FileTypeExt::is_symlink_dir`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
- [`os::windows::fs::FileTypeExt::is_symlink_file`]
  (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)

These types were previously stable in `std::ffi`, but are now also
available in `core` and `alloc`:

- [`core::ffi::CStr`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
- [`core::ffi::FromBytesWithNulError`]
  (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
- [`alloc::ffi::CString`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
- [`alloc::ffi::FromVecWithNulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
- [`alloc::ffi::IntoStringError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
- [`alloc::ffi::NulError`]
  (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)

These types were previously stable in `std::os::raw`, but are now
also available in `core::ffi` and `std::ffi`:

- [`ffi::c_char`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
- [`ffi::c_double`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
- [`ffi::c_float`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
- [`ffi::c_int`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
- [`ffi::c_long`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
- [`ffi::c_longlong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
- [`ffi::c_schar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
- [`ffi::c_short`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
- [`ffi::c_uchar`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
- [`ffi::c_uint`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
- [`ffi::c_ulong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
- [`ffi::c_ulonglong`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
- [`ffi::c_ushort`]
  (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)

These APIs are now usable in const contexts:

- [`slice::from_raw_parts`]
  (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)

Cargo
-----
- [Packages can now inherit settings from the workspace so that
  the settings can be centralized in one place.]
  (rust-lang/cargo#10859) See
  [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
  and
  [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
  for more details on how to define these common settings.
- [Cargo commands can now accept multiple `--target` flags to build
  for multiple targets at once]
  (rust-lang/cargo#10766), and the
  [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
  config option may now take an array of multiple targets.
- [The `--jobs` argument can now take a negative number to count
  backwards from the max CPUs.]
  (rust-lang/cargo#10844)
- [`cargo add` will now update `Cargo.lock`.]
  (rust-lang/cargo#10902)
- [Added](rust-lang/cargo#10838) the
  [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
  flag to `cargo rustc` to override the crate type.
- [Significantly improved the performance fetching git dependencies from GitHub
  when using a hash in the `rev` field.]
  (rust-lang/cargo#10079)

Misc
----
- [The `rust-analyzer` rustup component is now available on the stable channel.]
  (rust-lang/rust#98640)

Compatibility Notes
-------------------
- The minimum required versions for all `-linux-gnu` targets are
  now at least kernel 3.2 and glibc 2.17, for targets that previously
  supported older versions: [Increase the minimum linux-gnu
  versions](rust-lang/rust#95026)
- [Network primitives are now implemented with the ideal Rust
  layout, not the C system layout]
  (rust-lang/rust#78802). This can
  cause problems when transmuting the types.
- [Add assertion that `transmute_copy`'s `U` is not larger than `T`]
  (rust-lang/rust#98839)
- [A soundness bug in `BTreeMap` was fixed]
  (rust-lang/rust#99413) that allowed data
  it was borrowing to be dropped before the container.
- [The Drop behavior of C-like enums cast to ints has changed]
  (rust-lang/rust#96862). These are already
  discouraged by a compiler warning.
- [Relate late-bound closure lifetimes to parent fn in NLL]
  (rust-lang/rust#98835)
- [Errors at const-eval time are now in future incompatibility reports]
  (rust-lang/rust#97743)
- On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements
  were erroneously accepted if they used the high registers (r8 to
  r14) as an input/output operand. [This is no longer accepted]
  (rust-lang/rust#99155).
- [`impl Trait` was accidentally accepted as the associated type
  value of return-position `impl Trait`]
  (rust-lang/rust#97346), without
  fulfilling all the trait bounds of that associated type, as long
  as the hidden type satisfies said bounds. This has been fixed.

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- Windows builds now use profile-guided optimization, providing
  10-20% improvements to compiler performance: [Utilize PGO for
  windows x64 rustc dist builds]
  (rust-lang/rust#96978)
- [Stop keeping metadata in memory before writing it to disk]
  (rust-lang/rust#96544)
- [compiletest: strip debuginfo by default for mode=ui]
  (rust-lang/rust#98140)
- Many improvements to generated code for derives, including
  performance improvements:
  - [Don't use match-destructuring for derived ops on structs.]
    (rust-lang/rust#98446)
  - [Many small deriving cleanups]
    (rust-lang/rust#98741)
  - [More derive output improvements]
    (rust-lang/rust#98758)
  - [Clarify deriving code](rust-lang/rust#98915)
  - [Final derive output improvements]
    (rust-lang/rust#99046)
  - [Stop injecting `#[allow(unused_qualifications)]` in generated
    `derive` implementations](rust-lang/rust#99485)
  - [Improve `derive(Debug)`](rust-lang/rust#98190)
- [Bump to clap 3](rust-lang/rust#98213)
- [fully move dropck to mir](rust-lang/rust#98641)
- [Optimize `Vec::insert` for the case where `index == len`.]
  (rust-lang/rust#98755)
- [Convert rust-analyzer to an in-tree tool]
  (rust-lang/rust#99603)
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Too lenient #[may_dangle] on BTreeMap; misses PhantomData for dropck