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Bumps rust-toolchain from 1.93.1 to 1.99.1.

Release notes

Sourced from rust-toolchain's releases.

Rust 1.99.1

• library: fix missing symbol wcslen on UEFI and embedded targets
• rustc: fix miscompilation of FFI bool return values on x86_64
• rust-lld: add the rpath for libLLVM on macOS

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

... (truncated)

Changelog

Sourced from rust-toolchain's changelog.

Version 1.99.1 (2026-10-15)

• library: fix missing symbol wcslen on UEFI and embedded targets
• rustc: fix miscompilation of FFI bool return values on x86_64
• rust-lld: add the rpath for libLLVM on macOS

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

... (truncated)

Commits

• 58cf8f9 Auto merge of #164232 - cuviper:stable-next, r=cuviper
• d1e0df5 1.99.1 release
• 2c2dcb6 sync RELEASES.md from main
• 6089430 Fix the bug by enabling extension for bool returns on x86_64
• e24cbd7 Add test coverage
• 29c9616 fix(bootstrap/darwin): fix rpath for distributed LLD
• fde4b23 Add wcslen builtin
• b940084 Auto merge of #163440 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum
• 8fa690e 1.99.0 release notes
• 19d7dab 1.99.0 release
• Additional commits viewable in compare view

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