Rust 1.63.0

Language

--------

- [Remove migrate borrowck mode for pre-NLL errors.][95565]

- [Modify MIR building to drop repeat expressions with length zero.][95953]

- [Remove label/lifetime shadowing warnings.][96296]

- [Allow explicit generic arguments in the presence of impl Trait args.][96868]

- [Make cenum_impl_drop_cast warnings deny-by-default.][97652]

- [Prevent unwinding when -C panic=abort is used regardless of declared ABI.][96959]

- [lub: don't bail out due to empty binders.][97867]

Compiler

--------

- [Stabilize the bundle native library modifier,][95818] also removing the

deprecated static-nobundle linking kind.

- [Add Apple WatchOS compile targets\*.][95243]

- [Add a Windows application manifest to rustc-main.][96737]

\* Refer to Rust's [platform support page][platform-support-doc] for more

information on Rust's tiered platform support.

Libraries

---------

- [Implement Copy, Clone, PartialEq and Eq for core::fmt::Alignment.][94530]

- [Extend ptr::null and null_mut to all thin (including extern) types.][94954]

- [impl Read and Write for VecDeque.][95632]

- [STD support for the Nintendo 3DS.][95897]

- [Use rounding in float to Duration conversion methods.][96051]

- [Make write/print macros eagerly drop temporaries.][96455]

- [Implement internal traits that enable [OsStr]::join.][96881]

- [Implement Hash for core::alloc::Layout.][97034]

- [Add capacity documentation for OsString.][97202]

- [Put a bound on collection misbehavior.][97316]

- [Make std::mem::needs_drop accept ?Sized.][97675]

- [impl Termination for Infallible and then make the Result impls of Termination more generic.][97803]

- [Document Rust's stance on /proc/self/mem.][97837]

Stabilized APIs

---------------

- [array::from_fn]

- [Box::into_pin]

- [BinaryHeap::try_reserve]

- [BinaryHeap::try_reserve_exact]

- [OsString::try_reserve]

- [OsString::try_reserve_exact]

- [PathBuf::try_reserve]

- [PathBuf::try_reserve_exact]

- [Path::try_exists]

- [Ref::filter_map]

- [RefMut::filter_map]

- [NonNull::<[T]>::len][NonNull::::len]

- [ToOwned::clone_into]

- [Ipv6Addr::to_ipv4_mapped]

- [unix::io::AsFd]

- [unix::io::BorrowedFd<'fd>]

- [unix::io::OwnedFd]

- [windows::io::AsHandle]

- [windows::io::BorrowedHandle<'handle>]

- [windows::io::OwnedHandle]

- [windows::io::HandleOrInvalid]

- [windows::io::HandleOrNull]

- [windows::io::InvalidHandleError]

- [windows::io::NullHandleError]

- [windows::io::AsSocket]

- [windows::io::BorrowedSocket<'handle>]

- [windows::io::OwnedSocket]

- [thread::scope]

- [thread::Scope]

- [thread::ScopedJoinHandle]

These APIs are now usable in const contexts:

- [array::from_ref]

- [slice::from_ref]

- [intrinsics::copy]

- [intrinsics::copy_nonoverlapping]

- [<*const T>::copy_to]

- [<*const T>::copy_to_nonoverlapping]

- [<*mut T>::copy_to]

- [<*mut T>::copy_to_nonoverlapping]

- [<*mut T>::copy_from]

- [<*mut T>::copy_from_nonoverlapping]

- [str::from_utf8]

- [Utf8Error::error_len]

- [Utf8Error::valid_up_to]

- [Condvar::new]

- [Mutex::new]

- [RwLock::new]

Cargo

-----

- [Stabilize the --config path command-line argument.][cargo/10755]

- [Expose rust-version in the environment as CARGO_PKG_RUST_VERSION.][cargo/10713]

Compatibility Notes

-------------------

- [#[link] attributes are now checked more strictly,][96885] which may introduce

errors for invalid attribute arguments that were previously ignored.

- [Rounding is now used when converting a float to a Duration.][96051] The converted

duration can differ slightly from what it was.

Internal Changes

----------------

These changes provide no direct user facing benefits, but represent significant

improvements to the internals and overall performance of rustc

and related tools.

- [Prepare Rust for LLVM opaque pointers.][94214]

[94214]: https://github.com/rust-lang/rust/pull/94214/

[94530]: https://github.com/rust-lang/rust/pull/94530/

[94954]: https://github.com/rust-lang/rust/pull/94954/

[95243]: https://github.com/rust-lang/rust/pull/95243/

[95565]: https://github.com/rust-lang/rust/pull/95565/

[95632]: https://github.com/rust-lang/rust/pull/95632/

[95818]: https://github.com/rust-lang/rust/pull/95818/

[95897]: https://github.com/rust-lang/rust/pull/95897/

[95953]: https://github.com/rust-lang/rust/pull/95953/

[96051]: https://github.com/rust-lang/rust/pull/96051/

[96296]: https://github.com/rust-lang/rust/pull/96296/

[96455]: https://github.com/rust-lang/rust/pull/96455/

[96737]: https://github.com/rust-lang/rust/pull/96737/

[96868]: https://github.com/rust-lang/rust/pull/96868/

[96881]: https://github.com/rust-lang/rust/pull/96881/

[96885]: https://github.com/rust-lang/rust/pull/96885/

[96959]: https://github.com/rust-lang/rust/pull/96959/

[97034]: https://github.com/rust-lang/rust/pull/97034/

[97202]: https://github.com/rust-lang/rust/pull/97202/

[97316]: https://github.com/rust-lang/rust/pull/97316/

[97652]: https://github.com/rust-lang/rust/pull/97652/

[97675]: https://github.com/rust-lang/rust/pull/97675/

[97803]: https://github.com/rust-lang/rust/pull/97803/

[97837]: https://github.com/rust-lang/rust/pull/97837/

[97867]: https://github.com/rust-lang/rust/pull/97867/

[cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/

[cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/

[array::from_fn]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html

[Box::into_pin]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin

[BinaryHeap::try_reserve_exact]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact

[BinaryHeap::try_reserve]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve

[OsString::try_reserve]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve

[OsString::try_reserve_exact]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact

[PathBuf::try_reserve]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve

[PathBuf::try_reserve_exact]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact

[Path::try_exists]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists

[Ref::filter_map]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map

[RefMut::filter_map]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map

[NonNull::::len]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len

[ToOwned::clone_into]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into

[Ipv6Addr::to_ipv4_mapped]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped

[unix::io::AsFd]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html

[unix::io::BorrowedFd<'fd>]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html

[unix::io::OwnedFd]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html

[windows::io::AsHandle]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html

[windows::io::BorrowedHandle<'handle>]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html

[windows::io::OwnedHandle]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html

[windows::io::HandleOrInvalid]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html

[windows::io::HandleOrNull]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html

[windows::io::InvalidHandleError]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html

[windows::io::NullHandleError]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html

[windows::io::AsSocket]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html

[windows::io::BorrowedSocket<'handle>]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html

[windows::io::OwnedSocket]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html

[thread::scope]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html

[thread::Scope]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html

[thread::ScopedJoinHandle]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html

[array::from_ref]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html

[slice::from_ref]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html

[intrinsics::copy]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html

[intrinsics::copy_nonoverlapping]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html

[<*const T>::copy_to]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to

[<*const T>::copy_to_nonoverlapping]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping

[<*mut T>::copy_to]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1

[<*mut T>::copy_to_nonoverlapping]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1

[<*mut T>::copy_from]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from

[<*mut T>::copy_from_nonoverlapping]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping

[str::from_utf8]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html

[Utf8Error::error_len]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len

[Utf8Error::valid_up_to]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to

[Condvar::new]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new

[Mutex::new]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new

[RwLock::new]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new