docs(setup): correct README-DEV.md's Rust toolchain instructions - #4752
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README-DEV.md describes Rust as a mise-managed tool pinned to 1.88.0.
Neither half is true: `mise.toml` declares no `rust` tool at all, and the
toolchain is pinned to 1.93.0 by `rust-toolchain.toml`. A contributor
following the file literally installs the wrong version, sets a default
that is overridden anyway, and then reads `mise install` producing no
Rust as a broken setup rather than the intended design.
Four inaccuracies, all the same root cause:
- "It replaces the need for nvm, rbenv, pyenv, rustup, and other
version managers" — rustup is precisely what is still required.
- The `mise.toml` excerpt lists `rust = "1.88.0"`; there is no such
entry.
- Manual Setup runs `rustup install 1.88.0` / `rustup default 1.88.0`.
Wrong version, and `rust-toolchain.toml` overrides both regardless.
- The IDE section points at `~/.local/share/mise/installs/rust/1.88.0/`,
a path that never exists.
Rust is deliberately not in `mise.toml`, and the repo already depends on
that: `mise.toml:31` works around the 1.93.0 pin for cargo-shear via
RUSTUP_TOOLCHAIN, `sdk_tests/crates/java/setup.sh:51-54` documents the
rustup shim resolving `rust-toolchain.toml` "on the mise arm" and warns
that an explicit `rustup run` breaks the nix arm, and
`sdks/swift/scripts/build-xcframework.sh:81` notes that setting a default
toolchain "does nothing — rust-toolchain.toml wins". `setup-dev.sh` never
installs Rust; it only reports `rustc --version`. There are also three
`rust-toolchain.toml` files with per-directory pins that a single mise
entry could not express.
So this documents the real mechanism rather than adding the missing mise
entry: a `rust` tool in `mise.toml` would be a second source of truth
that loses to the override anyway and would need syncing across four
files.
Adds a short "Rust toolchain" section covering where the pin lives, that
rustup applies it automatically on first use inside the repo, how to
confirm it, and that the absence of `~/.local/share/mise/installs/rust/`
is expected.
Verified against the current toolchain: with no rustup default set,
`rustc` fails outside the repo and resolves to 1.93.0 inside it, with
`rustup show active-toolchain` reporting the `rust-toolchain.toml`
override.
Scope is Rust only. The same `mise.toml` excerpt is separately stale for
go, python and node; left alone here.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TmU8doXq5VDwN9WrVrDjGv
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughREADME-DEV.md now documents Rust management through rustup and workspace-specific ChangesRust toolchain documentation
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🔵 Low · up to The Rust setup documentation could cause developers to expect automatic toolchain updates or install a default toolchain different from the workspace requirement. Clarify these instructions before merge to avoid inconsistent local development environments. Poem
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Inline comments:
In `@README-DEV.md`:
- Around line 94-98: Update the rustup installer command in the development
setup instructions to pass --default-toolchain none and -y, ensuring rustup
installs without selecting an unintended default toolchain while preserving
rust-toolchain.toml as the repository toolchain source.
- Around line 55-57: Update the rustup behavior description near the
confirmation instructions to remove the claim that invoking cargo or rustc
updates the toolchain; retain only the automatic installation and selection
behavior, and state that updates require rustup update if the documentation
mentions updates.
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README-DEV.md
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Thanks for the PR! Two notes:
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Review feedback asked for less documentation, not more: README-DEV
predates the current infra, and the fix is to state plainly that we use
mise, direnv and rustup rather than to explain at length what was wrong.
Corrects four stale references, all one-liners:
- "replaces the need for nvm, rbenv, pyenv, rustup" — rustup is still
required.
- The `mise.toml` excerpt listed `rust = "1.88.0"`; no such entry
exists.
- Manual Setup ran `rustup install 1.88.0` / `rustup default 1.88.0`,
which `rust-toolchain.toml` overrides anyway.
- The IDE section pointed at
`~/.local/share/mise/installs/rust/1.88.0/`, a path that never
exists.
Adds a short "Toolchain" section naming mise, direnv and rustup, placed
before the mise deep-dive so the reader gets the map first. direnv was
not mentioned anywhere, despite `.envrc` being what activates mise and
sets the build environment.
Two changes are aimed at the maintenance burden rather than the current
text. No version number is hardcoded in anything this commit writes, so
it cannot go stale the way `1.88.0` did — the IDE line now says Rust is
rustup-managed rather than naming a path, and the `[tools]` excerpt
under Configuration is replaced by a link to `mise.toml`, since a
hand-synced copy had already drifted for go, python and node.
The new section defers to "Rust workspace toolchains" (BoundaryML#4703) rather
than restating the per-workspace pins.
Documentation only.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TmU8doXq5VDwN9WrVrDjGv
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README-DEV.mddescribes Rust as a mise-managed tool pinned to 1.88.0.Neither is true:
mise.tomldeclares norustentry, and each workspace pinsits own toolchain in
rust-toolchain.tomlfor rustup to pick up.Four stale references, all one-liners:
still required.
mise.tomlexcerpt listedrust = "1.88.0"; there is no such entry.rustup install 1.88.0/rustup default 1.88.0, whichrust-toolchain.tomloverrides anyway.~/.local/share/mise/installs/rust/1.88.0/, apath that never exists.
Adds a short Toolchain section naming the three tools that actually manage
the dev environment — mise, direnv and rustup — placed before the mise
deep-dive so the reader gets the map first. direnv was not mentioned anywhere,
despite
.envrcbeing what activates mise and sets the build environment.Two changes target the maintenance burden rather than the current text. No
version number is hardcoded in anything this PR writes, so it cannot go stale
the way
1.88.0did: the IDE line now says Rust is rustup-managed instead ofnaming a versioned path, and the
[tools]excerpt under Configuration isreplaced by a link to
mise.toml, since the hand-synced copy had alreadydrifted for
go,pythonandnode.The new section defers to "Rust workspace toolchains" (#4703) rather than
restating the per-workspace pins.
Net +1 line. Documentation only; no code, build or CI changes.
Investigated with AI-assisted tooling, reviewed and verified by me before
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