Update Rust to v1.85.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rust		minor	1.82.0 -> 1.85.0
rust		minor	1.82.0@sha256:33a0ea4769482be860174e1139c457bdcb2a236a988580a28c3a48824cbc17d6 -> 1.85.0
rust	final	minor	1.82.0 -> 1.85.0

---

Release Notes

rust-lang/rust (rust)

v1.85.0

Compare Source

==========================

Language

• The 2024 Edition is now stable.
  See the edition guide for more details.
• Stabilize async closures
  See RFC 3668 for more details.
• Stabilize #[diagnostic::do_not_recommend]
• Add unpredictable_function_pointer_comparisons lint to warn against function pointer comparisons
• Lint on combining #[no_mangle] and #[export_name] attributes.

Compiler

• The unstable flag -Zpolymorphize has been removed, see https://github.com/rust-lang/compiler-team/issues/810 for some background.

Platform Support

• Promote powerpc64le-unknown-linux-musl to tier 2 with host tools

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries

• Panics in the standard library now have a leading library/ in their path

• std::env::home_dir() on Windows now ignores the non-standard $HOME environment variable

  It will be un-deprecated in a subsequent release.

• Add AsyncFn* to the prelude in all editions.

Stabilized APIs

• BuildHasherDefault::new
• ptr::fn_addr_eq
• io::ErrorKind::QuotaExceeded
• io::ErrorKind::CrossesDevices
• {float}::midpoint
• Unsigned {integer}::midpoint
• NonZeroU*::midpoint
• impl std::iter::Extend for tuples with arity 1 through 12
• FromIterator<(A, ...)> for tuples with arity 1 through 12
• std::task::Waker::noop

These APIs are now stable in const contexts:

• mem::size_of_val
• mem::align_of_val
• Layout::for_value
• Layout::align_to
• Layout::pad_to_align
• Layout::extend
• Layout::array
• std::mem::swap
• std::ptr::swap
• NonNull::new
• HashMap::with_hasher
• HashSet::with_hasher
• BuildHasherDefault::new
• <float>::recip
• <float>::to_degrees
• <float>::to_radians
• <float>::max
• <float>::min
• <float>::clamp
• <float>::abs
• <float>::signum
• <float>::copysign
• MaybeUninit::write

Cargo

• Add future-incompatibility warning against keywords in cfgs and add raw-idents
• Stabilize higher precedence trailing flags
• Pass CARGO_CFG_FEATURE to build scripts

Rustdoc

• Doc comment on impl blocks shows the first line, even when the impl block is collapsed

Compatibility Notes

• rustc no longer treats the test cfg as a well known check-cfg, instead it is up to the build systems and users of --check-cfg[^check-cfg] to set it as a well known cfg using --check-cfg=cfg(test).

  This is done to enable build systems like Cargo to set it conditionally, as not all source files are suitable for unit tests.
  Cargo (for now) unconditionally sets the test cfg as a well known cfg.
  [^check-cfg]: https://doc.rust-lang.org/nightly/rustc/check-cfg.html

• Disable potentially incorrect type inference if there are trivial and non-trivial where-clauses

• std::env::home_dir() has been deprecated for years, because it can give surprising results in some Windows configurations if the HOME environment variable is set (which is not the normal configuration on Windows). We had previously avoided changing its behavior, out of concern for compatibility with code depending on this non-standard configuration. Given how long this function has been deprecated, we're now fixing its behavior as a bugfix. A subsequent release will remove the deprecation for this function.

• Make core::ffi::c_char signedness more closely match that of the platform-default char

  This changed c_char from an i8 to u8 or vice versa on many Tier 2 and 3
  targets (mostly Arm and RISC-V embedded targets). The new definition may
  result in compilation failures but fixes compatibility issues with C.

  The libc crate matches this change as of its 0.2.169 release.

• When compiling a nested macro_rules macro from an external crate, the content of the inner macro_rules is now built with the edition of the external crate, not the local crate.

• Increase sparcv9-sun-solaris and x86_64-pc-solaris Solaris baseline to 11.4.

• Show abi_unsupported_vector_types lint in future breakage reports

• Error if multiple super-trait instantiations of dyn Trait need associated types to be specified but only one is provided

• Change powerpc64-ibm-aix default codemodel to large

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.

• Build x86_64-unknown-linux-gnu with LTO for C/C++ code (e.g., jemalloc)

v1.84.1

Compare Source

==========================

• Fix ICE 132920 in duplicate-crate diagnostics.
• Fix errors for overlapping impls in incremental rebuilds.
• Fix slow compilation related to the next-generation trait solver.
• Fix debuginfo when LLVM's location discriminator value limit is exceeded.
• Fixes for building Rust from source:
  • Only try to distribute llvm-objcopy if llvm tools are enabled.
  • Add Profile Override for Non-Git Sources.
  • Resolve symlinks of LLVM tool binaries before copying them.
  • Make it possible to use ci-rustc on tarball sources.

v1.84.0

Compare Source

==========================

Language

• Allow #[deny] inside #[forbid] as a no-op
• Show a warning when -Ctarget-feature is used to toggle features that can lead to unsoundness due to ABI mismatches
• Use the next-generation trait solver in coherence
• Allow coercions to drop the principal of trait objects
• Support / as the path separator for include!() in all cases on Windows
• Taking a raw ref (raw (const|mut)) of a deref of a pointer (*ptr) is now safe
• Stabilize s390x inline assembly
• Stabilize Arm64EC inline assembly
• Lint against creating pointers to immediately dropped temporaries
• Execute drop glue when unwinding in an extern "C" function

Compiler

• Add --print host-tuple flag to print the host target tuple and affirm the "target tuple" terminology over "target triple"
• Declaring functions with a calling convention not supported on the current target now triggers a hard error
• Set up indirect access to external data for loongarch64-unknown-linux-{musl,ohos}
• Enable XRay instrumentation for LoongArch Linux targets
• Extend the unexpected_cfgs lint to also warn in external macros
• Stabilize WebAssembly multivalue, reference-types, and tail-call target features
• Added Tier 2 support for the wasm32v1-none target

Libraries

• Implement From<&mut {slice}> for Box/Rc/Arc<{slice}>
• Move <float>::copysign, <float>::abs, <float>::signum to core
• Add LowerExp and UpperExp implementations to NonZero
• Implement FromStr for CString and TryFrom<CString> for String
• std::os::darwin has been made public

Stabilized APIs

• Ipv6Addr::is_unique_local
• Ipv6Addr::is_unicast_link_local
• core::ptr::with_exposed_provenance
• core::ptr::with_exposed_provenance_mut
• <ptr>::addr
• <ptr>::expose_provenance
• <ptr>::with_addr
• <ptr>::map_addr
• <int>::isqrt
• <int>::checked_isqrt
• <uint>::isqrt
• NonZero::isqrt
• core::ptr::without_provenance
• core::ptr::without_provenance_mut
• core::ptr::dangling
• core::ptr::dangling_mut
• Pin::as_deref_mut

These APIs are now stable in const contexts

• AtomicBool::from_ptr
• AtomicPtr::from_ptr
• AtomicU8::from_ptr
• AtomicU16::from_ptr
• AtomicU32::from_ptr
• AtomicU64::from_ptr
• AtomicUsize::from_ptr
• AtomicI8::from_ptr
• AtomicI16::from_ptr
• AtomicI32::from_ptr
• AtomicI64::from_ptr
• AtomicIsize::from_ptr
• <ptr>::is_null
• <ptr>::as_ref
• <ptr>::as_mut
• Pin::new
• Pin::new_unchecked
• Pin::get_ref
• Pin::into_ref
• Pin::get_mut
• Pin::get_unchecked_mut
• Pin::static_ref
• Pin::static_mut

Cargo

• Stabilize MSRV-aware resolver config
• Stabilize resolver v3

Rustdoc

• rustdoc-search: improve type-driven search

Compatibility Notes

• Enable by default the LSX target feature for LoongArch Linux targets
• The unstable -Zprofile flag (“gcov-style” coverage instrumentation) has been removed. This does not affect the stable flags for coverage instrumentation (-Cinstrument-coverage) and profile-guided optimization (-Cprofile-generate, -Cprofile-use), which are unrelated and remain available.
• Support for the target named wasm32-wasi has been removed as the target is now named wasm32-wasip1. This completes the transition plan for this target following the introduction of wasm32-wasip1 in Rust 1.78. Compiler warnings on use of wasm32-wasi introduced in Rust 1.81 are now gone as well as the target is removed.
• The syntax &pin (mut|const) T is now parsed as a type which in theory could affect macro expansion results in some edge cases
• Legacy syntax for calling std::arch functions is no longer permitted to declare items or bodies (such as closures, inline consts, or async blocks).
• Declaring functions with a calling convention not supported on the current target now triggers a hard error
• The next-generation trait solver is now enabled for coherence, fixing multiple soundness issues

v1.83.0

Compare Source

==========================

Language

• Stabilize &mut, *mut, &Cell, and *const Cell in const.
• Allow creating references to statics in const initializers.
• Implement raw lifetimes and labels ('r#ident).
• Define behavior when atomic and non-atomic reads race.
• Non-exhaustive structs may now be empty.
• Disallow implicit coercions from places of type !
• const extern functions can now be defined for other calling conventions.
• Stabilize expr_2021 macro fragment specifier in all editions.
• The non_local_definitions lint now fires on less code and warns by default.

Compiler

• Deprecate unsound -Csoft-float flag.
• Add many new tier 3 targets:
  • aarch64_unknown_nto_qnx700
  • arm64e-apple-tvos
  • armv7-rtems-eabihf
  • loongarch64-unknown-linux-ohos
  • riscv32-wrs-vxworks and riscv64-wrs-vxworks
  • riscv32{e|em|emc}-unknown-none-elf
  • x86_64-unknown-hurd-gnu
  • x86_64-unknown-trusty

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries

• Implement PartialEq for ExitCode.
• Document that catch_unwind can deal with foreign exceptions without UB, although the exact behavior is unspecified.
• Implement Default for HashMap/HashSet iterators that don't already have it.
• Bump Unicode to version 16.0.0.
• Change documentation of ptr::add/sub to not claim equivalence with offset.

Stabilized APIs

• BufRead::skip_until
• ControlFlow::break_value
• ControlFlow::continue_value
• ControlFlow::map_break
• ControlFlow::map_continue
• DebugList::finish_non_exhaustive
• DebugMap::finish_non_exhaustive
• DebugSet::finish_non_exhaustive
• DebugTuple::finish_non_exhaustive
• ErrorKind::ArgumentListTooLong
• ErrorKind::Deadlock
• ErrorKind::DirectoryNotEmpty
• ErrorKind::ExecutableFileBusy
• ErrorKind::FileTooLarge
• ErrorKind::HostUnreachable
• ErrorKind::IsADirectory
• ErrorKind::NetworkDown
• ErrorKind::NetworkUnreachable
• ErrorKind::NotADirectory
• ErrorKind::NotSeekable
• ErrorKind::ReadOnlyFilesystem
• ErrorKind::ResourceBusy
• ErrorKind::StaleNetworkFileHandle
• ErrorKind::StorageFull
• ErrorKind::TooManyLinks
• Option::get_or_insert_default
• Waker::data
• Waker::new
• Waker::vtable
• char::MIN
• hash_map::Entry::insert_entry
• hash_map::VacantEntry::insert_entry

These APIs are now stable in const contexts:

• Cell::into_inner
• Duration::as_secs_f32
• Duration::as_secs_f64
• Duration::div_duration_f32
• Duration::div_duration_f64
• MaybeUninit::as_mut_ptr
• NonNull::as_mut
• NonNull::copy_from
• NonNull::copy_from_nonoverlapping
• NonNull::copy_to
• NonNull::copy_to_nonoverlapping
• NonNull::slice_from_raw_parts
• NonNull::write
• NonNull::write_bytes
• NonNull::write_unaligned
• OnceCell::into_inner
• Option::as_mut
• Option::expect
• Option::replace
• Option::take
• Option::unwrap
• Option::unwrap_unchecked
• Option::<&_>::copied
• Option::<&mut _>::copied
• Option::<Option<_>>::flatten
• Option::<Result<_, _>>::transpose
• RefCell::into_inner
• Result::as_mut
• Result::<&_, _>::copied
• Result::<&mut _, _>::copied
• Result::<Option<_>, _>::transpose
• UnsafeCell::get_mut
• UnsafeCell::into_inner
• array::from_mut
• char::encode_utf8
• {float}::classify
• {float}::is_finite
• {float}::is_infinite
• {float}::is_nan
• {float}::is_normal
• {float}::is_sign_negative
• {float}::is_sign_positive
• {float}::is_subnormal
• {float}::from_bits
• {float}::from_be_bytes
• {float}::from_le_bytes
• {float}::from_ne_bytes
• {float}::to_bits
• {float}::to_be_bytes
• {float}::to_le_bytes
• {float}::to_ne_bytes
• mem::replace
• ptr::replace
• ptr::slice_from_raw_parts_mut
• ptr::write
• ptr::write_unaligned
• <*const _>::copy_to
• <*const _>::copy_to_nonoverlapping
• <*mut _>::copy_from
• <*mut _>::copy_from_nonoverlapping
• <*mut _>::copy_to
• <*mut _>::copy_to_nonoverlapping
• <*mut _>::write
• <*mut _>::write_bytes
• <*mut _>::write_unaligned
• slice::from_mut
• slice::from_raw_parts_mut
• <[_]>::first_mut
• <[_]>::last_mut
• <[_]>::first_chunk_mut
• <[_]>::last_chunk_mut
• <[_]>::split_at_mut
• <[_]>::split_at_mut_checked
• <[_]>::split_at_mut_unchecked
• <[_]>::split_first_mut
• <[_]>::split_last_mut
• <[_]>::split_first_chunk_mut
• <[_]>::split_last_chunk_mut
• str::as_bytes_mut
• str::as_mut_ptr
• str::from_utf8_unchecked_mut

Cargo

• Introduced a new CARGO_MANIFEST_PATH environment variable, similar to CARGO_MANIFEST_DIR but pointing directly to the manifest file.
• Added package.autolib to the manifest, allowing [lib] auto-discovery to be disabled.
• Declare support level for each crate in Cargo's Charter / crate docs.
• Declare new Intentional Artifacts as 'small' changes.

Rustdoc

• The sidebar / hamburger menu table of contents now includes the # headers from the main item's doc comment. This is similar to a third-party feature provided by the rustdoc-search-enhancements browser extension.

Compatibility Notes

• Warn against function pointers using unsupported ABI strings.

• Check well-formedness of the source type's signature in fn pointer casts. This partly closes a soundness hole that comes when casting a function item to function pointer

• Use equality instead of subtyping when resolving type dependent paths.

• Linking on macOS now correctly includes Rust's default deployment target. Due to a linker bug, you might have to pass MACOSX_DEPLOYMENT_TARGET or fix your #[link] attributes to point to the correct frameworks. See #​129369.

• Rust will now correctly raise an error for repr(Rust) written on non-struct/enum/union items, since it previous did not have any effect.

• The future incompatibility lint deprecated_cfg_attr_crate_type_name has been made into a hard error. It was used to deny usage of #![crate_type] and #![crate_name] attributes in #![cfg_attr], which required a hack in the compiler to be able to change the used crate type and crate name after cfg expansion.
  Users can use --crate-type instead of #![cfg_attr(..., crate_type = "...")] and --crate-name instead of #![cfg_attr(..., crate_name = "...")] when running rustc/cargo rustc on the command line.
  Use of those two attributes outside of #![cfg_attr] continue to be fully supported.

• Until now, paths into the sysroot were always prefixed with /rustc/$hash in diagnostics, codegen, backtrace, e.g.

  thread 'main' panicked at 'hello world', map-panic.rs:2:50
  stack backtrace:
     0: std::panicking::begin_panic
               at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/std/src/panicking.rs:616:12
     1: map_panic::main::{{closure}}
               at ./map-panic.rs:2:50
     2: core::option::Option<T>::map
               at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/option.rs:929:29
     3: map_panic::main
               at ./map-panic.rs:2:30
     4: core::ops::function::FnOnce::call_once
               at /rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ops/function.rs:248:5
  note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
  

  RFC 3127 said

  We want to change this behaviour such that, when rust-src source files can be discovered, the virtual path is discarded and therefore the local path will be embedded, unless there is a --remap-path-prefix that causes this local path to be remapped in the usual way.

  #​129687 implements this behaviour, when rust-src is present at compile time, rustc replaces /rustc/$hash with a real path into the local rust-src component with best effort.
  To sanitize this, users must explicitly supply --remap-path-prefix=<path to rust-src>=foo or not have the rust-src component installed.

• The allow-by-default missing_docs lint used to disable itself when invoked through rustc --test/cargo test, resulting in #[expect(missing_docs)] emitting false positives due to the expectation being wrongly unfulfilled. This behavior has now been removed, which allows #[expect(missing_docs)] to be fulfilled in all scenarios, but will also report new missing_docs diagnostics for publicly reachable #[cfg(test)] items, integration test crate-level documentation, and publicly reachable items in integration tests.

• The armv8r-none-eabihf target now uses the Armv8-R required set of floating-point features.

• Fix a soundness bug where rustc wouldn't detect unconstrained higher-ranked lifetimes in a dyn Trait's associated types that occur due to supertraits.

• Update the minimum external LLVM version to 18.

• Remove aarch64-fuchsia and x86_64-fuchsia target aliases in favor of aarch64-unknown-fuchsia and x86_64-unknown-fuchsia respectively.

• The ABI-level exception class of a Rust panic is now encoded with native-endian bytes, so it is legible in hex dumps.

• Visual Studio 2013 is no longer supported for MSVC targets.

• The sysroot no longer contains the std dynamic library in its top-level lib/ dir.

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