Update Rust to v1.96.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rust (source, changelog)	toolchain	minor	1.94.1 → 1.96.0
rust		minor	1.94.1 → 1.96.0

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Release Notes

rust-lang/rust (rust)

v1.96.0

Compare Source

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

Language

• Allow passing expr metavariable to cfg
• Always coerce never types in tuple expressions
• Avoid incorrect inference guidance of function arguments in rare cases
• Support s390x vector registers in inline assembly
• Allow using constants of type ManuallyDrop as patterns (fixing a regression introduced in 1.94.0)

Compiler

• Enable link relaxation feature for LoongArch Linux targets
• Update riscv64gc-unknown-fuchsia baseline to RVA22 + vector

Libraries

• Support iterating over ranges of NonZero integers
• refactor 'valid for read/write' definition: exclude null; add that as an exception on individual methods instead
• Fix SGX delayed host lookup via ToSocketAddr

Stabilized APIs

• assert_matches!
• debug_assert_matches!
• From<T> for AssertUnwindSafe<T>
• From<T> for LazyCell<T, F>
• From<T> for LazyLock<T, F>
• core::range::RangeToInclusive
• core::range::RangeToInclusiveIter
• core::range::RangeFrom
• core::range::RangeFromIter
• core::range::Range
• core::range::RangeIter

Cargo

• Allow a dependency to specify both a git repository and an alternate registry. Just like with crates.io, the git repository will be used locally, but the registry version will be used when published.
• Added target.'cfg(..)'.rustdocflags support in configuration.
• Fixed CVE-2026-5222 and CVE-2026-5223.

Rustdoc

• Deprecation notes are now rendered like any other documentation. Previously they used the css white-space: pre-wrap; property and stripped any <p> elements from the rendered html, however this caused issues and unintuitive behavior. The new behavior should be more predictable, however some multi-line deprecation notes will now be rendered as as single lines. If this is undesirable, you can use the standard markdown method of forcing a linebreak, which is two spaces followed by a newline ("\n").
• Don't emit rustdoc missing_doc_code_examples lint on impl items
• Separate methods and associated functions in sidebar

Compatibility Notes

• Fix layout of #[repr(Int)] enums in some edge cases involving fields of uninhabited zero-sized types
• Prevent unsize-coercing into Pin<Foo> where Foo doesn't implement Deref. Some such coercions were previously allowed, but produce a type with no useful public API.
• rustc: Stop passing --allow-undefined on wasm targets
• Gate the accidentally stabilized #![reexport_test_harness_main] attribute
• Error on return-position-impl-trait-in-traits whose types are too private
• Report the uninhabited_static lint in dependencies and make it deny-by-default
• Distributed builds now contain non-split debuginfo for windows-gnu
  This appears to improve the quality of backtraces. This change has no effect on the defaults for the output of rustc/cargo on these targets.
• Check const generic arguments are correctly typed in more positions
• Remove -Csoft-float
• Importing structs with ::{self [as name]}, e.g., struct S {}; use S::{self as Other};, is now no longer permitted because {self} imports require a module parent.
• For export_name, link_name, and link_section attributes, if multiple of the same attribute is present, the first one now takes precedence.
• Update the minimum external LLVM to 21
• On avr targets, C's double type is 32-bit by default, so change c_double to f32 on avr targets to match. This is a breaking change, but necessary to make c_double match C's double.

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.

• JSON targets: aarch64 softfloat targets now have to have rustc_abi set to "softfloat"
• target specs: stricter checks for LLVM ABI values, and correlate that with cfg(target_abi)

v1.95.0

Compare Source

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

Language

• Stabilize if let guards on match arms
• irrefutable_let_patterns lint no longer lints on let chains
• Support importing path-segment keywords with renaming
• Stabilize inline assembly for PowerPC and PowerPC64
• const-eval: be more consistent in the behavior of padding during typed copies
• Const blocks are no longer evaluated to determine if expressions involving fallible operations can implicitly be constant-promoted.. Expressions whose ability to implicitly be promoted would depend on the result of a const block are no longer implicitly promoted.
• Make operational semantics of pattern matching independent of crate and module

Compiler

• Stabilize --remap-path-scope for controlling the scoping of how paths get remapped in the resulting binary
• Apply patches for CVE-2026-6042 and CVE-2026-40200 to vendored musl

Platform Support

• Promote powerpc64-unknown-linux-musl to Tier 2 with host tools
• Promote aarch64-apple-tvos to Tier 2
• Promote aarch64-apple-tvos-sim to Tier 2
• Promote aarch64-apple-watchos to Tier 2
• Promote aarch64-apple-watchos-sim to Tier 2
• Promote aarch64-apple-visionos to Tier 2
• Promote aarch64-apple-visionos-sim to Tier 2

Refer to Rust's platform support page
for more information on Rust's tiered platform support.

Libraries

• thread::scope: document how join interacts with TLS destructors
• Speed up str::contains on aarch64 targets with neon target feature enabled by default

Stabilized APIs

• MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>
• MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>
• MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>
• MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>
• MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>
• [MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>
• Cell<[T; N]>: AsRef<[Cell<T>; N]>
• Cell<[T; N]>: AsRef<[Cell<T>]>
• Cell<[T]>: AsRef<[Cell<T>]>
• bool: TryFrom<{integer}>
• AtomicPtr::update
• AtomicPtr::try_update
• AtomicBool::update
• AtomicBool::try_update
• AtomicIn::update
• AtomicIn::try_update
• AtomicUn::update
• AtomicUn::try_update
• cfg_select!
• mod core::range
• core::range::RangeInclusive
• core::range::RangeInclusiveIter
• core::hint::cold_path
• <*const T>::as_ref_unchecked
• <*mut T>::as_ref_unchecked
• <*mut T>::as_mut_unchecked
• Vec::push_mut
• Vec::insert_mut
• VecDeque::push_front_mut
• VecDeque::push_back_mut
• VecDeque::insert_mut
• LinkedList::push_front_mut
• LinkedList::push_back_mut
• Layout::dangling_ptr
• Layout::repeat
• Layout::repeat_packed
• Layout::extend_packed

These previously stable APIs are now stable in const contexts:

• fmt::from_fn
• ControlFlow::is_break
• ControlFlow::is_continue

Rustdoc

• In search results, rank unstable items lower
• Add new "hide deprecated items" setting in rustdoc

Compatibility Notes

• Array coercions may now result in less inference constraints than before
• Importing $crate without renaming, i.e. use $crate::{self};, is now no longer permitted due to stricter error checking for self imports.
• const-eval: be more consistent in the behavior of padding during typed copies.
  In very rare cases, this may cause compilation errors due to bytes from parts of a pointer ending up in the padding bytes of a const or static.
• A future-incompatibility warning lint ambiguous_glob_imported_traits is now reported when using an ambiguously glob imported trait
• Check lifetime bounds of types mentioning only type parameters
• Report more visibility-related ambiguous import errors
• Deprecate Eq::assert_receiver_is_total_eq and emit future compatibility warnings on manual impls
• powerpc64: Use the ELF ABI version set in target spec instead of guessing (fixes the ELF ABI used by the OpenBSD target)
• Matching on a #[non_exhaustive] enum now reads the discriminant, even if the enum has only one variant. This can cause closures to capture values that they previously wouldn't.
• mut ref and mut ref mut patterns, part of the unstable Match Ergonomics 2024 RFC, were accidentally allowed on stable within struct pattern field shorthand. These patterns are now correctly feature-gated as unstable in this position.
• Add future-compatibility warning for derive helper attributes which conflict with built-in attributes
• JSON target specs have been destabilized and now require -Z unstable-options to use. Previously, they could not be used without the standard library, which has no stable build mechanism. In preparation for the build-std project adding that support, JSON target specs are being proactively gated to ensure they remain unstable even if build-std is stabilized. Cargo now includes the -Z json-target-spec CLI flag to automatically pass -Z unstable-options to the compiler when needed. See #​150151, #​151534, and rust-lang/cargo#16557.
• The arguments of #[feature] attributes on invalid targets are now checked

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.

• Update to LLVM 22

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