chore(deps): update dependency rust to v1.91.0

🎉 Stabilize build.build-dir. This config sets the directory where intermediate build artifacts are stored. These artifacts are produced by Cargo and rustc during the build process. End users usually won't need to interact with them, and the layout inside build-dir is an implementation detail that may change without notice. (config doc) (build cache doc) #15833 #15840
The --target flag and the build.target configuration can now take literal "host-tuple" string, which will internally be substituted by the host machine's target triple. #15838 #16003 #16032

Rustdoc

In search results, rank doc aliases lower than non-alias items with the same name
Raw pointers now work in type-based search like references. This means you can now search for things like *const u8 ->, and additionally functions that take or return raw pointers will now display their signature properly in search results.

Compatibility Notes

Always require coroutine captures to be drop-live
Apple: Always pass SDK root when linking with cc, and pass it via SDKROOT env var. This should fix linking issues with rustc running inside Xcode. Libraries in /usr/local/lib may no longer be linked automatically, if you develop or use a crate that relies on this, you should explicitly set cargo::rustc-link-search=/usr/local/lib in a build.rs script.
Relaxed bounds in associated type bound position like in TraitRef<AssocTy: ?Sized> are now correctly forbidden
Add unstable #[sanitize(xyz = "on|off")] built-in attribute that shadows procedural macros with the same name
Fix the drop checker being more permissive for bindings declared with let-else
Be more strict when parsing attributes, erroring on many invalid attributes
- Error on invalid #[should_panic] attributes
- Error on invalid #[link] attributes
Mark all deprecation lints in name resolution as deny-by-default and also report in dependencies
The lint semicolon_in_expressions_from_macros, for macro_rules! macros in expression position that expand to end in a semicolon (;), is now deny-by-default. It was already warn-by-default, and a future compatibility warning (FCW) that warned even in dependencies. This lint will become a hard error in the future.
Trait impl modifiers (e.g., unsafe, !, default) in inherent impls are no longer syntactically valid
Start reporting future breakage for ill_formed_attribute_input in dependencies
Restrict the scope of temporaries created by the macros pin!, format_args!, write!, and writeln! in if let scrutinees in Rust Edition 2024. This applies Rust Edition 2024's if let temporary scope rules to these temporaries, which previously could live past the if expression regardless of Edition.
Invalid numeric literal suffixes in tuple indexing, tuple struct indexing, and struct field name positions are now correctly rejected
Closures marked with the keyword static are now syntactically invalid
Shebangs inside --cfg and --check-cfg arguments are no longer allowed
Add future incompatibility lint for temporary lifetime shortening in Rust 1.92

Cargo compatibility notes:

cargo publish no longer keeps .crate tarballs as final build artifacts when build.build-dir is set. These tarballs were previously included due to an oversight and are now treated as intermediate artifacts. To get .crate tarballs as final artifacts, use cargo package. In a future version, this change will apply regardless of build.build-dir. #15910
Adjust Cargo messages to match rustc diagnostic style. This changes some of the terminal colors used by Cargo messages. #15928
Tools and projects relying on the internal details of Cargo's build-dir may not work for users changing their build-dir layout. For those doing so, we'd recommend proactively testing these cases particularly as we are considering changing the default location of the build-dir in the future (cargo#16147). If you can't migrate off of Cargo's internal details, we'd like to learn more about your use case as we prepare to change the layout of the build-dir (cargo#15010).

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 21

`v1.90.0`

Compare Source

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

Language

Split up the unknown_or_malformed_diagnostic_attributes lint. This lint has been split up into four finer-grained lints, with unknown_or_malformed_diagnostic_attributes now being the lint group that contains these lints:
1. unknown_diagnostic_attributes: unknown to the current compiler
2. misplaced_diagnostic_attributes: placed on the wrong item
3. malformed_diagnostic_attributes: malformed attribute syntax or options
4. malformed_diagnostic_format_literals: malformed format string literal
Allow constants whose final value has references to mutable/external memory, but reject such constants as patterns
Allow volatile access to non-Rust memory, including address 0

Compiler

Use lld by default on x86_64-unknown-linux-gnu.
Tier 3 musl targets now link dynamically by default. Affected targets:
- mips64-unknown-linux-muslabi64
- powerpc64-unknown-linux-musl
- powerpc-unknown-linux-musl
- powerpc-unknown-linux-muslspe
- riscv32gc-unknown-linux-musl
- s390x-unknown-linux-musl
- thumbv7neon-unknown-linux-musleabihf

Platform Support

Demote x86_64-apple-darwin to Tier 2 with host tools

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

Libraries

Stabilized APIs

These previously stable APIs are now stable in const contexts:

Cargo

Rustdoc

Add ways to collapse all impl blocks. Previously the "Summary" button and "-" keyboard shortcut would never collapse impl blocks, now they do when shift is held
Display unsafe attributes with unsafe() wrappers

Compatibility Notes

Use lld by default on x86_64-unknown-linux-gnu. See also https://blog.rust-lang.org/2025/09/01/rust-lld-on-1.90.0-stable/.
Make core::iter::Fuse's Default impl construct I::default() internally as promised in the docs instead of always being empty
Set MSG_NOSIGNAL for UnixStream This may change program behavior but results in the same behavior as other primitives (e.g., stdout, network sockets). Programs relying on signals to terminate them should update handling of sockets to handle errors on write by exiting.
On Unix std::env::home_dir will use the fallback if the HOME environment variable is empty
We now reject unsupported extern "{abi}"s consistently in all positions. This primarily affects the use of implementing traits on an extern "{abi}" function pointer, like extern "stdcall" fn(), on a platform that doesn't support that, like aarch64-unknown-linux-gnu. Direct usage of these unsupported ABI strings by declaring or defining functions was already rejected, so this is only a change for consistency.
const-eval: error when initializing a static writes to that static
Check that the proc_macro_derive macro has correct arguments when applied to the crate root

`v1.89.0`

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

Language

Stabilize explicitly inferred const arguments (feature(generic_arg_infer))
Add a warn-by-default mismatched_lifetime_syntaxes lint. This lint detects when the same lifetime is referred to by different syntax categories between function arguments and return values, which can be confusing to read, especially in unsafe code. This lint supersedes the warn-by-default elided_named_lifetimes lint.
Expand unpredictable_function_pointer_comparisons to also lint on function pointer comparisons in external macros
Make the dangerous_implicit_autorefs lint deny-by-default
Stabilize the avx512 target features
Stabilize kl and widekl target features for x86
Stabilize sha512, sm3 and sm4 target features for x86
Stabilize LoongArch target features f, d, frecipe, lasx, lbt, lsx, and lvz
Remove i128 and u128 from improper_ctypes_definitions
Stabilize repr128 (#[repr(u128)], #[repr(i128)])
Allow #![doc(test(attr(..)))] everywhere
Extend temporary lifetime extension to also go through tuple struct and tuple variant constructors
extern "C" functions on the wasm32-unknown-unknown target now have a standards compliant ABI

Compiler

Platform Support

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

Libraries

Stabilized APIs

NonZero<char>
Many intrinsics for x86, not enumerated here
- AVX512 intrinsics
- SHA512, SM3 and SM4 intrinsics
File::lock
File::lock_shared
File::try_lock
File::try_lock_shared
File::unlock
NonNull::from_ref
NonNull::from_mut
NonNull::without_provenance
NonNull::with_exposed_provenance
NonNull::expose_provenance
OsString::leak
PathBuf::leak
Result::flatten
std::os::linux::net::TcpStreamExt::quickack
std::os::linux::net::TcpStreamExt::set_quickack

These previously stable APIs are now stable in const contexts:

Cargo

cargo fix and cargo clippy --fix now default to the same Cargo target selection as other build commands. Previously it would apply to all targets (like binaries, examples, tests, etc.). The --edition flag still applies to all targets.
Stabilize doctest-xcompile. Doctests are now tested when cross-compiling. Just like other tests, it will use the runner setting to run the tests. If you need to disable tests for a target, you can use the ignore doctest attribute to specify the targets to ignore.

Rustdoc

On mobile, make the sidebar full width and linewrap. This makes long section and item names much easier to deal with on mobile.

Compatibility Notes

Make missing_fragment_specifier an unconditional error
Enabling the neon target feature on aarch64-unknown-none-softfloat causes a warning because mixing code with and without that target feature is not properly supported by LLVM
Sized Hierarchy: Part I
- Introduces a small breaking change affecting ?Sized bounds on impls on recursive types which contain associated type projections. It is not expected to affect any existing published crates. Can be fixed by refactoring the involved types or opting into the sized_hierarchy unstable feature. See the FCP report for a code example.
The warn-by-default elided_named_lifetimes lint is superseded by the warn-by-default mismatched_lifetime_syntaxes lint.
Error on recursive opaque types earlier in the type checker
Type inference side effects from requiring element types of array repeat expressions are Copy are now only available at the end of type checking
The deprecated accidentally-stable std::intrinsics::{copy,copy_nonoverlapping,write_bytes} are now proper intrinsics. There are no debug assertions guarding against UB, and they cannot be coerced to function pointers.
Remove long-deprecated std::intrinsics::drop_in_place
Make well-formedness predicates no longer coinductive
Remove hack when checking impl method compatibility
Remove unnecessary type inference due to built-in trait object impls
Lint against "stdcall", "fastcall", and "cdecl" on non-x86-32 targets
Future incompatibility warnings relating to the never type (!) are now reported in dependencies
Ensure std::ptr::copy_* intrinsics also perform the static self-init checks
extern "C" functions on the wasm32-unknown-unknown target now have a standards compliant ABI

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.

Correctly un-remap compiler sources paths with the rustc-dev component

`v1.88.0`

Compare Source

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

Language

Stabilize #![feature(let_chains)] in the 2024 edition. This feature allows &&-chaining let statements inside if and while, allowing intermixture with boolean expressions. The patterns inside the let sub-expressions can be irrefutable or refutable.
Stabilize #![feature(naked_functions)]. Naked functions allow writing functions with no compiler-generated epilogue and prologue, allowing full control over the generated assembly for a particular function.
Stabilize #![feature(cfg_boolean_literals)]. This allows using boolean literals as cfg predicates, e.g. #[cfg(true)] and #[cfg(false)].
Fully de-stabilize the #[bench] attribute. Usage of #[bench] without #![feature(custom_test_frameworks)] already triggered a deny-by-default future-incompatibility lint since Rust 1.77, but will now become a hard error.
Add warn-by-default dangerous_implicit_autorefs lint against implicit autoref of raw pointer dereference. The lint will be bumped to deny-by-default in the next version of Rust.
Add invalid_null_arguments lint to prevent invalid usage of null pointers. This lint is uplifted from clippy::invalid_null_ptr_usage.
Change trait impl candidate preference for builtin impls and trivial where-clauses.
Check types of generic const parameter defaults

Compiler

Stabilize -Cdwarf-version for selecting the version of DWARF debug information to generate.

Platform Support

Demote i686-pc-windows-gnu to Tier 2.

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

Libraries

Stabilized APIs

These previously stable APIs are now stable in const contexts:

Cargo

Rustdoc

Compatibility Notes

Finish changing the internal representation of pasted tokens. Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a tt fragment specifier can often fix these macros.
Fully de-stabilize the #[bench] attribute. Usage of #[bench] without #![feature(custom_test_frameworks)] already triggered a deny-by-default future-incompatibility lint since Rust 1.77, but will now become a hard error.
Fix borrow checking some always-true patterns. The borrow checker was overly permissive in some cases, allowing programs that shouldn't have compiled.
Update the minimum external LLVM to 19.
Make it a hard error to use a vector type with a non-Rust ABI without enabling the required target feature.

Configuration

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Oct 01 '25 00:10 renovate[bot]