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build: give the standalone crates outside src/ their own [workspace] table - #46981
Cargo takes the root Cargo.toml (Rewrite Bun in Rust #30412) as the workspace root of every crate below it. That file excludes only vendor (Cargo.toml:131).
Fix
Four manifests get their own [workspace] table, as scripts/verify-baseline-static/Cargo.toml:8 has. Cargo then stops at that manifest. bun-macro joins its parent.
packages/bun-native-plugin-rs/Cargo.lock matches its manifest again.
workspace-lints.test.ts runs cargo metadata on every tracked manifest outside src/. It does not check lock files or compilation.
A consumer workspace that holds the plugin crate by path fails with multiple workspace roots found in the same workspace (7 of 15 layouts, see Notes). crates.io and git consumers are not affected.
The lint job uses the runner's unpinned stable cargo. The pinned nightly costs a 9.9 s install per run.
bun-build-mdx-rs loads but does not compile (serde::__private, see Notes).
Notes
State on main (449877f).cargo metadata --no-deps --offline exits 101 for 5 of the 6 tracked manifests outside src/. scripts/verify-baseline-static is the sixth. #30412 gave it a [workspace] table because CI builds it (.buildkite/ci.ts:788). No CI job and no test builds the other five in place. test-tonic.test.ts copies its fixture to the OS temp directory first. The people who hit the error build the bun:ffi bench.
The tables. Four manifests get a table. bun-macro gets none: packages/bun-native-plugin-rs/Cargo.toml names it in members, and a second table there makes cargo fail with multiple workspace roots. The member is explicit, so it does not depend on the path key of the bun-macro dependency.
Measurements. Linux x64, cargo 1.100.0-nightly (the pinned one) and stable 1.99.1. strace, valgrind and perf are not installed on the machine. Syscalls are from a ptrace counter, allocations from an LD_PRELOAD malloc counter, instructions from perf_event_open.
Root workspace: 0 changed lines in Cargo.toml, Cargo.lock and the src/ manifests. 123 members. The member-id hash is equal on main and on the PR.
Root cargo metadata --no-deps: 3,619 syscalls and 357,841 allocations on main, 3,619 and 357,841 on the PR (delta 0 / 0). Instructions, with the files toggled in one directory, 6 pairs: -3,752 to +762 of 258.96 M.
Standalone manifests that load: 1/6 on main, 6/6 on the PR (pinned nightly), 6/6 on the PR (stable cargo).
Repo-root Cargo.toml opened by the five crates: 0 times on the PR, 5 on main. cargo metadata in bench/ffi/src: 3,631 syscalls and 351,886 allocations on main (exit 101), 308 and 54,665 on the PR (exit 0).
Packaged Cargo.toml[workspace] lines: 0 (bun-macro), 0 (bun-native-plugin). Both packaged manifests are byte-identical to the ones from main. .crate size against a copy of main outside the tree: +452 B (bun-macro, all in the packaged Cargo.lock) and +81 B (bun-native-plugin).
cargo package exit codes [bun-macro, bun-native-plugin]: [0, 0] on a clean clone, [0, 0] after a build. Tracked files modified: 0. cargo build --locked: exit 0 (exit 101 with the old lock).
Consumer path layouts that load: 15 of 15 on main, 8 of 15 on the PR. The 7 that change fail with multiple workspace roots found in the same workspace.
Guard: 8 spawns (1 rustup, 6 cargo, 1 git). The file takes +88 ms median (main 54 ms, PR 141 ms, IQR 137 to 148 ms, n=20). Mutations caught: 10/10. Controls green: 3/3. Extra source-lints runs: +11 per 3,165 commits.
Ninja edges dirtied by the PR: 0. Edited files among ninja inputs: 0 of 10.
Consumer layouts. Each layout is a consumer of packages/bun-native-plugin-rs by a path dependency. The 7 that stop loading have the crate directory below the root of the consumer's own [workspace].
layout
main
PR
remedy, checked
bun checkout below a virtual workspace
loads
fails
entry in the consumer's workspace.exclude
bun checkout below a root package with [workspace]
loads
fails
same
copy of the crate below a virtual workspace
loads
fails
same
copy of the crate below a root package with [workspace]
loads
fails
same
copy of the crate matched by a members glob
loads
fails
same
consumer lists the crate in its own members
loads
fails
remove that entry and add the exclude entry
bun fork that lists the mdx crate as a root member
A git dependency on the repository passes cargo check on main and on the PR. GitHub code search finds 3 independent consumers of bun-native-plugin, and all 3 use the crates.io release. One fork, aphrody-labs/bun, lists these crates as root members. The new lint also fails in a fork of that kind.
The lint. It lists manifests with git ls-files, so it sees a staged manifest. It leaves out a manifest that is not on disk (a sparse checkout). It also reports a crate outside src/ that a path dependency makes a member of the root workspace.
The lint runs no rustup proxy, because a proxy downloads what the machine lacks. It asks rustup which --toolchain for the cargo of an installed toolchain, with RUSTUP_AUTO_INSTALL=0, and runs that binary. The toolchain is RUSTUP_TOOLCHAIN, or the channel of rust-toolchain.toml. The lint is skipped where that toolchain is not installed. The workflow step runs cargo --version first, so a runner without cargo fails the step.
I ran the lint with rustup 1.26.0, 1.27.1, 1.28.0, 1.28.1 and 1.29.1, with a local server in place of static.rust-lang.org. Each version made 0 requests. The lint passes where the toolchain is installed, and it is skipped where it is not.
Mutations that turn the lint red:
a table removed (4 manifests)
a table added to bun-macro
bun-macro neither listed nor a path dependency
a member outside src/ added to the root
a new tracked crate without a table
a new tracked crate below a crate that has a table
a crate outside src/ that a member reaches by a path dependency
The toolchain of the lint job. Every other Rust toolchain in a workflow is the dated nightly. RUSTUP_TOOLCHAIN: stable is the first that is not. The runner image ships it, and the result is the same with both toolchains. RUSTUP_TOOLCHAIN: nightly-2026-09-15 is the alternative. It adds an install from static.rust-lang.org to a merge-queue job. The install took 9.9 s and 602 MB on my machine. A maintainer can ask for the pin.
Proof with the debug build.bun bd test test/internal/source-lints/workspace-lints.test.ts with src/ and packages/ at the base: 2 pass, 1 fail (3 manifests refused). On the branch: 3 pass. With all five manifests at the base, the lint names all five.
Other suites.bun test test/internal/source-lints/: 185 pass. test-tonic.test.ts with the --timeout of the CI runner: 1 pass, with the release build and with the debug build. It also passes with a target/ directory and an invalid Cargo.lock in the fixture. The test does not copy them. bun run build in bench/ffi exits 0 and the bench runs. tonic-server builds in place with PROTOC set, and its new .gitignore keeps target/ and Cargo.lock out of git status.
Not in this PR.
packages/bun-build-mdx-rs does not compile from a clean clone. mdxjs 0.2.15 and 1.0.4 both fail with error[E0432]: unresolved import serde::__private. A serde = ">=1, <1.0.225" bound makes cargo check pass. Remove dead code from bun_runtime, bun_core, bun_ast, bun_io, and an orphaned package #40969 proposes to delete the crate. If it merges first, the mdx hunk goes away.
No CI job compiles the standalone crates or checks their lock files. That needs a cargo check --locked job.
Cargo takes the repo-root Cargo.toml as the workspace root of every crate
below it. The root lists only the crates in src/ and excludes only vendor/,
so each cargo command in bench/ffi/src, packages/bun-build-mdx-rs,
packages/bun-native-plugin-rs, its bun-macro and the tonic-server fixture
fails with "current package believes it's in a workspace when it's not".
Each of those crates now has a [workspace] table of its own, as
scripts/verify-baseline-static has. bun-macro is a member of the
bun-native-plugin-rs workspace. The Cargo.lock of bun-native-plugin-rs
matches its manifest again (0.2.0, no napi dependency).
workspace-lints.test.ts runs `cargo metadata` on every tracked manifest
outside src/ and checks that every workspace member is below src/. The
source-lints workflow runs for a change to any Cargo.toml and uses the
stable cargo of the runner.
A rustup `cargo` that runs in the repo root applies rust-toolchain.toml in
full. Before it runs, it installs each component and target of that file
that the machine lacks. The lint now names the channel in RUSTUP_TOOLCHAIN
(or passes on the one the workflow sets), turns auto-install off, and is
skipped where no cargo runs.
The lint fails on a git exit code, not on a warning that git prints.
The tonic-server fixture ignores the Cargo.lock and target/ of a build in
place. The comments in the bun-build-mdx-rs and tonic-server manifests no
longer name a tracked Cargo.lock that does not exist.
Status: reproduced on main (449877f). cargo metadata --no-deps --offline exits 101 with current package believes it's in a workspace when it's not in each of these directories:
The change adds standalone Cargo workspace declarations to selected manifests. The source-lint workflow now runs when Cargo manifests change, uses the stable toolchain, and tests workspace member paths and tracked manifests outside the workspace.
These manifests define standalone workspaces. The native plugin workspace includes bun-macro. The tonic-server fixture ignores /target and /Cargo.lock.
The workflow triggers on Cargo manifest changes and sets RUSTUP_TOOLCHAIN to stable. Tests check workspace member paths and run offline Cargo metadata checks on tracked manifests outside the workspace. The README documents the workflow’s toolchain and checkout constraints.
Suggested reviewers: jarred-sumner, dylan-conway
Priority: Normal
Merge Risk: Low · up to 2aa8a
The workspace lint could miss a future crate outside src/ becoming a root-workspace member. This is a bounded coverage gap that can be addressed with a follow-up.
Pre-merge checks: 4
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Title check
The title clearly and concisely describes the main change: adding workspace boundaries for standalone crates outside src/.
Linked Issues check
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The pull request description clearly explains the problem, the implementation, known downsides, limitations, and verification results. It does not use the template headings exactly, but it provides th…
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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Inline comments:
Review comments at @test/internal/source-lints/workspace-lints.test.ts:
- Around line 27-28: Update the src/ boundary test so it checks Cargo’s
effective workspace membership, not only the literal members list. Inside the
existing cargoRuns guard, run cargo metadata with --no-deps, --offline, and
--format-version 1 from repoRoot using cargoEnv, then require every package in
workspace_members to have a manifest_path under src/.
After applying the fix, consider running `coderabbit review --agent` for local
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…e proxy
rustup 1.26 and 1.27 do not know RUSTUP_AUTO_INSTALL. A proxy with
RUSTUP_TOOLCHAIN set to a toolchain that is not installed downloads it, so
the probe at the top of workspace-lints.test.ts could start a download when
the file is loaded. The lint now asks `rustup which --toolchain` for the
cargo of an installed toolchain and runs that binary. It is skipped where
there is none.
The lint also reports a crate outside src/ that cargo loads as a member of
the root workspace through a path dependency, and it leaves out a manifest
that is in the index but not on disk.
test-tonic.test.ts does not copy the target/ and Cargo.lock of a build in
place. The bun-native-plugin-rs manifest names the remedy for a workspace
that holds a copy of the crate.
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Problem
error: current package believes it's in a workspace when it's not. They arebench/ffi/src,packages/bun-build-mdx-rs,packages/bun-native-plugin-rs, itsbun-macro, and thetonic-serverfixture. The bun:ffi bench does not build (bun:ffi: CString is not a constructor to the engine,new CString(ptr)still returns a string #44226).Cargo.toml(Rewrite Bun in Rust #30412) as the workspace root of every crate below it. That file excludes onlyvendor(Cargo.toml:131).Fix
[workspace]table, asscripts/verify-baseline-static/Cargo.toml:8has. Cargo then stops at that manifest.bun-macrojoins its parent.packages/bun-native-plugin-rs/Cargo.lockmatches its manifest again.workspace-lints.test.tsrunscargo metadataon every tracked manifest outsidesrc/. It does not check lock files or compilation.test/internal/source-lints/workspace-lints.test.ts. Alsotest/internal/source-lints/,test-tonic.test.ts, and thebench/ffibuild. Self-reviewed: 14 concerns raised, 13 addressed (not taken: deleting the mdx crate, which Remove dead code from bun_runtime, bun_core, bun_ast, bun_io, and an orphaned package #40969 proposes).Background
[workspace]table and requires membership.cargo packagestrips the table.excludelist: it fails in a nested checkout, and stable cargo still parses the root manifest. Membership (chore: include all standalone crates in the workspace #30712) adds tonic and napi to the root lock.Downsides
multiple workspace roots found in the same workspace(7 of 15 layouts, see Notes). crates.io and git consumers are not affected.bun-build-mdx-rsloads but does not compile (serde::__private, see Notes).Notes
State on main (449877f).
cargo metadata --no-deps --offlineexits 101 for 5 of the 6 tracked manifests outsidesrc/.scripts/verify-baseline-staticis the sixth. #30412 gave it a[workspace]table because CI builds it (.buildkite/ci.ts:788). No CI job and no test builds the other five in place.test-tonic.test.tscopies its fixture to the OS temp directory first. The people who hit the error build the bun:ffi bench.The tables. Four manifests get a table.
bun-macrogets none:packages/bun-native-plugin-rs/Cargo.tomlnames it inmembers, and a second table there makes cargo fail withmultiple workspace roots. The member is explicit, so it does not depend on thepathkey of thebun-macrodependency.Measurements. Linux x64, cargo 1.100.0-nightly (the pinned one) and stable 1.99.1.
strace,valgrindandperfare not installed on the machine. Syscalls are from a ptrace counter, allocations from anLD_PRELOADmalloc counter, instructions fromperf_event_open.Cargo.toml,Cargo.lockand thesrc/manifests. 123 members. The member-id hash is equal on main and on the PR.cargo metadata --no-deps: 3,619 syscalls and 357,841 allocations on main, 3,619 and 357,841 on the PR (delta 0 / 0). Instructions, with the files toggled in one directory, 6 pairs: -3,752 to +762 of 258.96 M.Cargo.tomlopened by the five crates: 0 times on the PR, 5 on main.cargo metadatainbench/ffi/src: 3,631 syscalls and 351,886 allocations on main (exit 101), 308 and 54,665 on the PR (exit 0).Cargo.toml[workspace]lines: 0 (bun-macro), 0 (bun-native-plugin). Both packaged manifests are byte-identical to the ones from main..cratesize against a copy of main outside the tree: +452 B (bun-macro, all in the packagedCargo.lock) and +81 B (bun-native-plugin).cargo packageexit codes [bun-macro, bun-native-plugin]: [0, 0] on a clean clone, [0, 0] after a build. Tracked files modified: 0.cargo build --locked: exit 0 (exit 101 with the old lock).multiple workspace roots found in the same workspace.Consumer layouts. Each layout is a consumer of
packages/bun-native-plugin-rsby apathdependency. The 7 that stop loading have the crate directory below the root of the consumer's own[workspace].workspace.exclude[workspace][workspace]membersglobmembersexcludeentry[patch], consumerexclude)A git dependency on the repository passes
cargo checkon main and on the PR. GitHub code search finds 3 independent consumers ofbun-native-plugin, and all 3 use the crates.io release. One fork, aphrody-labs/bun, lists these crates as root members. The new lint also fails in a fork of that kind.The lint. It lists manifests with
git ls-files, so it sees a staged manifest. It leaves out a manifest that is not on disk (a sparse checkout). It also reports a crate outsidesrc/that a path dependency makes a member of the root workspace.The lint runs no rustup proxy, because a proxy downloads what the machine lacks. It asks
rustup which --toolchainfor the cargo of an installed toolchain, withRUSTUP_AUTO_INSTALL=0, and runs that binary. The toolchain isRUSTUP_TOOLCHAIN, or the channel ofrust-toolchain.toml. The lint is skipped where that toolchain is not installed. The workflow step runscargo --versionfirst, so a runner without cargo fails the step.I ran the lint with rustup 1.26.0, 1.27.1, 1.28.0, 1.28.1 and 1.29.1, with a local server in place of static.rust-lang.org. Each version made 0 requests. The lint passes where the toolchain is installed, and it is skipped where it is not.
Mutations that turn the lint red:
bun-macrobun-macroneither listed nor a path dependencysrc/added to the rootsrc/that a member reaches by a path dependencyThe toolchain of the lint job. Every other Rust toolchain in a workflow is the dated nightly.
RUSTUP_TOOLCHAIN: stableis the first that is not. The runner image ships it, and the result is the same with both toolchains.RUSTUP_TOOLCHAIN: nightly-2026-09-15is the alternative. It adds an install from static.rust-lang.org to a merge-queue job. The install took 9.9 s and 602 MB on my machine. A maintainer can ask for the pin.Proof with the debug build.
bun bd test test/internal/source-lints/workspace-lints.test.tswithsrc/andpackages/at the base: 2 pass, 1 fail (3 manifests refused). On the branch: 3 pass. With all five manifests at the base, the lint names all five.Other suites.
bun test test/internal/source-lints/: 185 pass.test-tonic.test.tswith the--timeoutof the CI runner: 1 pass, with the release build and with the debug build. It also passes with atarget/directory and an invalidCargo.lockin the fixture. The test does not copy them.bun run buildinbench/ffiexits 0 and the bench runs.tonic-serverbuilds in place withPROTOCset, and its new.gitignorekeepstarget/andCargo.lockout ofgit status.Not in this PR.
packages/bun-build-mdx-rsdoes not compile from a clean clone.mdxjs0.2.15 and 1.0.4 both fail witherror[E0432]: unresolved import serde::__private. Aserde = ">=1, <1.0.225"bound makescargo checkpass. Remove dead code from bun_runtime, bun_core, bun_ast, bun_io, and an orphaned package #40969 proposes to delete the crate. If it merges first, the mdx hunk goes away.cargo check --lockedjob.workspace-lints.test.tsand thepaths:lists ofsource-lints.yml. The PR that merges second needs a rebase.**/Cargo.tomlcovers the two entries that Turn on the Rust lints and build restrictions that are already clean #46703 adds.