build(deps): bump rust-toolchain from 1.98.1 to 1.99.0

[dependabot]

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Bumps rust-toolchain from 1.98.1 to 1.99.0.

Release notes

Sourced from rust-toolchain's releases.

Rust 1.99.0

Language

• Add allow-by-default raw_borrows_via_references lint that checks for references that decay immediately into raw borrows
• Extend unconditional_panic lint to function calls that panic when the chunks/windows size is zero
• Stabilize C-variadic function definitions
• Stabilize the ability to use #[unsafe(naked)] functions to define C-variadic functions (#![feature(c_variadic_naked_functions)]).
• Trait methods are now resolved on an adjusted never type (producing a FCW)
• Coerce from inference variables to trait objects if the inference variable is related via subtyping to a type that is known to be Sized
• Stabilize #[my_macro] mod foo;. This allows outlined modules (mod foo;) anywhere in the body of a custom attribute or derive macro.
• Fix the overflowing_literals lint with repeated negation. For instance, it will now no longer lint on --128_i8, which is already detected by the arithmetic_overflow lint.
• Add POSIX symbols to the invalid_runtime_symbol_definitions and suspicious_runtime_symbol_definitions lints
• Lint unused #[path] attributes on inline modules
• Enable unreachable_cfg_select_predicates lint as part of unused lint group
• Stabilize passing 128-bit integers via vector registers with asm! on x86
• Explicitly document that some allocations are allowed to grow in-place (but none are allowed to shrink)
• We now guarantee that the contents of an UnsafeCell can be accessed without going through get
  • The invalid_reference_casting lint was adjusted accordingly
• Account for globally enabled target features in global_asm!
• Warn if an invalid doc attribute is used on a macro invocation

Compiler

• Convert -Ctarget-cpu into a target-modifier for AVR, AMDGCN and NVPTX
• Enable static_position_independent_executables on all gnu targets
• When providing a suggestion about a missing method, rustc now prefers an exactly matching name from a doc alias attribute over a similarity search from other method names. If your new users sometimes expect a method under a different name, adding a doc alias will now help them find it via rustc suggestions, in addition to helping them find it via rustdoc search: When suggesting method names, prefer exact doc aliases over similar names

Platform Support

• Promote riscv64-unknown-linux-musl to Tier 2 with host tools

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

Libraries

• Iteration on RangeInclusive (a..=b ranges) is now optimized better in some circumstances. As a side effect of this, the behavior of RangeInclusive values that has already been exhausted (as an iterator) has changed. For example, the return values of start() and end() on such ranges may return different values, and using such ranges as slice indexes may have different behavior. These behaviors were not guaranteed to be stable, so these changes are considered to not be breaking changes.
• Relax transmute_copy to accept ?Sized types
• Update transmute_copy to use a non-unwinding panic
• Don't escape U+FF9E and U+FF9F in escape_debug_ext
• Re-export core::fmt::NumBuffer in alloc (and std)

... (truncated)

Changelog

Sourced from rust-toolchain's changelog.

Version 1.99.0 (2026-10-01)

Language

• Add allow-by-default raw_borrows_via_references lint that checks for references that decay immediately into raw borrows
• Extend unconditional_panic lint to function calls that panic when the chunks/windows size is zero
• Stabilize C-variadic function definitions
• Stabilize the ability to use #[unsafe(naked)] functions to define C-variadic functions (#![feature(c_variadic_naked_functions)]).
• Trait methods are now resolved on an adjusted never type (producing a FCW)
• Coerce from inference variables to trait objects if the inference variable is related via subtyping to a type that is known to be Sized
• Stabilize #[my_macro] mod foo;. This allows outlined modules (mod foo;) anywhere in the body of a custom attribute or derive macro.
• Fix the overflowing_literals lint with repeated negation. For instance, it will now no longer lint on --128_i8, which is already detected by the arithmetic_overflow lint.
• Add POSIX symbols to the invalid_runtime_symbol_definitions and suspicious_runtime_symbol_definitions lints
• Lint unused #[path] attributes on inline modules
• Enable unreachable_cfg_select_predicates lint as part of unused lint group
• Stabilize passing 128-bit integers via vector registers with asm! on x86
• Explicitly document that some allocations are allowed to grow in-place (but none are allowed to shrink)
• We now guarantee that the contents of an UnsafeCell can be accessed without going through get
  • The invalid_reference_casting lint was adjusted accordingly
• Account for globally enabled target features in global_asm!
• Warn if an invalid doc attribute is used on a macro invocation

Compiler

• Convert -Ctarget-cpu into a target-modifier for AVR, AMDGCN and NVPTX
• Enable static_position_independent_executables on all gnu targets
• When providing a suggestion about a missing method, rustc now prefers an exactly matching name from a doc alias attribute over a similarity search from other method names. If your new users sometimes expect a method under a different name, adding a doc alias will now help them find it via rustc suggestions, in addition to helping them find it via rustdoc search: When suggesting method names, prefer exact doc aliases over similar names

Platform Support

• Promote riscv64-unknown-linux-musl to Tier 2 with host tools

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

Libraries

... (truncated)

Commits

• b940084 Auto merge of #163440 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum
• 8fa690e 1.99.0 release notes
• 19d7dab 1.99.0 release
• dfb0acc Auto merge of #163264 - flip1995:clippy-beta-backport, r=Mark-Simulacrum
• dcc47f7 fix: const_trait_impl related infinite loop in `needless_borrows_for_generi...
• 3c884f7 Don't suggest Box::leak in nonnull_unchecked_on_box_ptr (#17752)
• e5a9d6a Fix --explain lint lookup being case-mismatched (#17632)
• aa05936 Auto merge of #162987 - cuviper:beta-next, r=cuviper
• 9e8e33c build: Fix thumb_1 cfg to include all "thumb but not thumbv2" targets.
• bc562d5 c-b: Add aeabi_u(read|write)(4|8) intrinsics.
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The following will be added to the changelog

---

[0.5.3] - 2026-10-05

Automated Changes

• (deps) Bump rust-toolchain from 1.98.1 to 1.99.0

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