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build(toolchain): bump the pinned Rust from 1.97.0 to 1.99.0 - #2494
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The pin was two minor releases behind stable. A lab trial on ea1b015 (min-regress job 00476) found the move mechanical: fmt, tests, the MSRV lane and Kani all pass on 1.99, and clippy -D warnings fails only on lints that are new in 1.99 (about 54 sites in about 20 files). The MSRV floor stays at 1.95; 1.99 doesn't require moving it. This commit is the pin alone, so CI reports the exact lint sites on current main. The fixes follow in this branch. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Walkthrough
Merge Risk:
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title follows the Conventional Commit form type(scope): summary and states the primary change: the pinned Rust toolchain moves from 1.97.0 to 1.99.0. The changeset matches this, since rust-toolc… |
| Description check | |
The description follows the template. It has a Summary section that explains the toolchain bump, the unchanged MSRV, the no-behaviour-change claim, and a table of lint fixes with links to the related … |
| Docstring Coverage | |
Docstring coverage is 92.11% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 20 files. (1 skipped: 1… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
Full details: Title check
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Explanation
The title follows the Conventional Commit form
type(scope): summaryand states the primary change: the pinned Rust toolchain moves from 1.97.0 to 1.99.0. The changeset matches this, since rust-toolchain.toml is bumped and the lint fixes that the new clippy version requires are included. The title does not mention those lint fixes, but it is not required to cover every detail.
Full details: Description check
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Explanation
The description follows the template. It has a Summary section that explains the toolchain bump, the unchanged MSRV, the no-behaviour-change claim, and a table of lint fixes with links to the related work. It has a Testing section with CI results, local clippy and fmt results, and MSRV notes. The Checklist is filled in. The Summary does not link an issue with Refs or Closes, and the Testing section does not paste raw command output. The template asks for both, so these are minor gaps.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 92.11% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 20 files. (1 skipped: 1 unsupported.)
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Mechanical, with no behaviour change. Checked locally with clippy -D warnings on the 1.99 pin for the crates macOS can build (boxes, minvmd, minimald-rpc), and in CI for the rest. - assert_is_empty (39 sites, all tests): assert!(x.is_empty()) now carries a message that shows the value on failure. In hookscripts the checked call stages scripts, so its result is bound first rather than evaluated twice. - double_must_use (3, boxes::core::compose): drop a bare #[must_use] on functions whose return type is already must-use (iterators, boxed closures). - must_use_candidate (3, boxes::core::primitives accessors): add #[must_use]. - needless_borrows_for_generic_args (3, args): map_err(&val_err) becomes map_err(val_err). The closure captures by reference, so it is Copy. - chunks_exact(2) becomes as_chunks::<2>() (minimald net::switch, minimald-rpc trace). as_chunks is stable since 1.88, so the 1.95 MSRV is unaffected; trace's let-else fallback goes away because the length is checked first. - single_element_loop (mfile): a one-entry table loop becomes an if. - deprecated Atomic*::fetch_update becomes try_update (minvmd, cfg(test) only, so the MSRV check never compiles it). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ec copy - remote-proto: tonic-prost-build's generated code puts a bare #[must_use] on methods whose return type is already must-use. Allowed on the module that include!s it, with the reason. allow rather than expect, so a tonic release that stops emitting it doesn't fail the build. - bep (macOS keys): from_sec1_bytes(&bytes) instead of &bytes.to_vec(); CFData derefs to [u8] (unnecessary_to_owned). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ults Rust 1.99 flags three pub HostHandle methods returning Result<_, ()> (kill, get_attrs, get_screen). Err(()) means one documented thing on all of them: the host's loop is gone or wedged, a teardown race that callers discard or read as unavailable. Allowed with that justification to keep this bump mechanical; a named HostGone error type is the better follow-up. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Inline comments:
Review comments at @rust-toolchain.toml:
- Line 4: Update the beta-canary baseline reference associated with the
rust-toolchain.toml channel pin from 1.97.0 to 1.99.0 so it matches the
configured channel; leave the channel setting unchanged.
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📒 Files selected for processing: 22
crates/args/src/lib.rscrates/bep/src/keys.rscrates/boxes/src/client/composer.rscrates/boxes/src/client/config.rscrates/boxes/src/client/hookscripts.rscrates/boxes/src/core/bep.rscrates/boxes/src/core/compose.rscrates/boxes/src/core/compose/tests.rscrates/boxes/src/core/enumerate.rscrates/boxes/src/core/loadout.rscrates/boxes/src/core/policy.rscrates/boxes/src/core/primitives.rscrates/boxes/src/daemon/composer.rscrates/boxes/src/wire/request.rscrates/boxes/tests/client_flow2.rscrates/mfile/src/lib.rscrates/minimald-rpc/src/trace.rscrates/minimald/src/box_runtime/handle.rscrates/minimald/src/net/switch.rscrates/minvmd/src/box_registry.rscrates/remote-proto/src/lib.rsrust-toolchain.toml
💤 Files with no reviewable changes: 1
- crates/boxes/src/core/compose.rs
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The two comments still said 1.97.0 after the pin moved to 1.99.0 (CodeRabbit on #2494). The canary runs on beta and miri on nightly either way, so nothing executed changes. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Addressed in 67272ec: both comments name 1.99.0.
Summary
Bumps the pinned toolchain (
rust-toolchain.toml) from 1.97.0 to 1.99.0, two minor releases behind stable. The MSRV floor (rust-version = "1.95") is unchanged. There's no behaviour change: the rest is the lint fixes 1.99's clippy asks for.A lab trial on
ea1b015(min-regress job 00476, lab-r730) showed the move is mechanical: fmt, tests, the MSRV check and Kani all pass on 1.99. Currentmainhad a few more sites than the trial (a renamed crate, a new crate, and macOS-only code), all covered here:assert_is_emptyboxes)assert!(x.is_empty(), "expected empty, got {x:?}"). Inhookscriptsthe checked call stages scripts, so its result is bound first rather than evaluated twice.double_must_useboxes::core::compose)#[must_use]where the return type is already must-usedouble_must_useremote-proto, tonic codegen)#[allow]on the module thatinclude!s the generated code, with the reason. Notexpect, so a tonic release that stops emitting it doesn't break the build.must_use_candidateboxes::core::primitivesaccessors)#[must_use]needless_borrows_for_generic_argsargs)map_err(val_err); the closure captures by reference, so it'sCopychunks_exactwith a constant sizeminimald::net::switch,minimald-rpc::trace)as_chunks::<2>(), stable since 1.88, so within MSRVsingle_element_loopmfile)ifunnecessary_to_ownedbepmacOS keys)from_sec1_bytes(&bytes);CFDataderefs to[u8]result_unit_errminimaldHostHandle::{kill,get_attrs,get_screen})#[allow]with the reason:Err(())uniformly means "host loop gone or wedged" (a teardown race). A namedHostGoneerror type would be a better follow-up.deprecatedminvmd,cfg(test))fetch_updatebecomestry_update; test-only, so the MSRV check never compiles itTesting
--workspace --all-targets --locked -D warnings), the test lanes, KVM, Kani, cargo-deny, fmt, commitlint and the native daemon e2e all pass. The macOS microVMe2eis still running at the time of writing.cargo clippy --workspace --all-targets --keep-going -D warningsis clean for every crate macOS builds (boxes,minvmd,minimald-rpc,remote-proto,bep, …). The Linux-only crates were covered by CI.cargo fmt --all -- --check: clean.as_chunks).try_updateiscfg(test)only. The nightly MSRV lane will confirm.Checklist
BREAKING CHANGE:footer present if this is a breaking change (not breaking)🤖 Generated with Claude Code
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