[dependabot]

Bumps rust-toolchain from 1.90.0 to 1.91.0.

Release notes

Sourced from rust-toolchain's releases.

Rust 1.91.0

Language

• Lower pattern bindings in the order they're written and base drop order on primary bindings' order
• Stabilize declaration of C-style variadic functions for sysv64, win64, efiapi, and aapcs ABIs. This brings these ABIs in line with the C ABI: variadic functions can be declared in extern blocks but not defined.
• Add dangling_pointers_from_locals lint to warn against dangling pointers from local variables
• Upgrade semicolon_in_expressions_from_macros from warn to deny
• Stabilize LoongArch32 inline assembly
• Add warn-by-default integer_to_ptr_transmutes lint against integer-to-pointer transmutes
• Stabilize sse4a and tbm target features
• Add target_env = "macabi" and target_env = "sim" cfgs as replacements for the target_abi cfgs with the same values.

Compiler

• Don't warn on never-to-any as casts as unreachable

Platform Support

• Promote aarch64-pc-windows-gnullvm and x86_64-pc-windows-gnullvm to Tier 2 with host tools. Note: llvm-tools and MSI installers are missing but will be added in future releases.
• Promote aarch64-pc-windows-msvc to Tier 1

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

Libraries

• Print thread ID in panic message
• Fix overly restrictive lifetime in core::panic::Location::file return type
• Guarantee parameter order for _by() variants of min / max/ minmax in std::cmp
• Document assumptions about Clone and Eq traits
• std::thread: Return error if setting thread stack size fails This used to panic within the standard library.

Stabilized APIs

• Path::file_prefix
• AtomicPtr::fetch_ptr_add
• AtomicPtr::fetch_ptr_sub
• AtomicPtr::fetch_byte_add
• AtomicPtr::fetch_byte_sub
• AtomicPtr::fetch_or
• AtomicPtr::fetch_and

... (truncated)

Changelog

Sourced from rust-toolchain's changelog.

Version 1.91.0 (2025-10-30)

Language

• Lower pattern bindings in the order they're written and base drop order on primary bindings' order
• Stabilize declaration of C-style variadic functions for sysv64, win64, efiapi, and aapcs ABIs. This brings these ABIs in line with the C ABI: variadic functions can be declared in extern blocks but not defined.
• Add dangling_pointers_from_locals lint to warn against dangling pointers from local variables
• Upgrade semicolon_in_expressions_from_macros from warn to deny
• Stabilize LoongArch32 inline assembly
• Add warn-by-default integer_to_ptr_transmutes lint against integer-to-pointer transmutes
• Stabilize sse4a and tbm target features
• Add target_env = "macabi" and target_env = "sim" cfgs as replacements for the target_abi cfgs with the same values.

Compiler

• Don't warn on never-to-any as casts as unreachable

Platform Support

• Promote aarch64-pc-windows-gnullvm and x86_64-pc-windows-gnullvm to Tier 2 with host tools. Note: llvm-tools and MSI installers are missing but will be added in future releases.
• Promote aarch64-pc-windows-msvc to Tier 1

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

Libraries

• Print thread ID in panic message
• Fix overly restrictive lifetime in core::panic::Location::file return type
• Guarantee parameter order for _by() variants of min / max/ minmax in std::cmp
• Document assumptions about Clone and Eq traits
• std::thread: Return error if setting thread stack size fails This used to panic within the standard library.

... (truncated)

Commits

• f8297e3 Auto merge of #148216 - cuviper:stable-next, r=BoxyUwU,jackh726
• faf3e0b Further revert Deref for Cow to its 1.90.0 state
• 40c4f6d Auto merge of #148179 - cuviper:stable-next, r=cuviper
• be999ad 1.91.0 stable release
• e4f5031 fix(len_zero): don't eagerly call GenericArgs::type_at (#15660)
• 7ce3022 rustdoc-search: stringdex 0.0.2
• 716b84e rustdoc-search: stringdex update with more packing
• b0dd64f rustdoc-search: add descriptive comment to space-saving hack
• 8127760 rustdoc-search: use the same ID for entry and path to same item
• b77c3b1 rustdoc-search: delay loading type name IDs until type search
• Additional commits viewable in compare view

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Latest commit: cc38a0f

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[ScriptedAlchemy]

@dependabot rebase

[dependabot]

Looks like this PR has been edited by someone other than Dependabot. That means Dependabot can't rebase it - sorry!

If you're happy for Dependabot to recreate it from scratch, overwriting any edits, you can request @dependabot recreate.

[ScriptedAlchemy]

@dependabot recreate

[ScriptedAlchemy]

@dependabot rebase

[ScriptedAlchemy]

@dependabot rebase

[ScriptedAlchemy]

Closing this PR as Rust version 1.91.0 does not exist. The latest stable Rust version is 1.83.x as of November 2025. This appears to be an invalid version suggestion from Dependabot.

Build failures show: error[E0463]: can't find crate for 'core' because the toolchain version cannot be installed.

If we want to upgrade Rust, we should create a new PR with a valid stable version.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[ScriptedAlchemy]

Reopening - my initial assessment was incorrect. Rust 1.91.0 does exist (released Oct 30, 2025).

The actual issue is that the CI workflow needs to install cross-compilation targets for musl builds. The error can't find crate for 'core' occurs because targets like x86_64-unknown-linux-musl and aarch64-unknown-linux-musl aren't being installed.

Investigating the CI workflow to fix the target installation.