[bryan-minimal]

Since #667 (d0b0026, 2026-09-24) the rust package ships no rustdoc. The current world's rust artifact (1b13bbd7…, spec 8cefa3f0…) has cargo cargo-clippy cargo-fmt clippy-driver rust-analyzer rust-gdb rust-lldb rustc rustfmt in usr/bin, and nothing else.

Why: #667 set tools = ["cargo", "clippy", "rustfmt", "rust-analyzer"] in bootstrap.toml (to keep the offline-hostile src step out). In Rust 1.98.1's bootstrap, dist::Rustc::prepare_image copies rustdoc only when build.tools is unset or lists "rustdoc":

// If enabled, copy rustdoc binary
if builder.config.tools.as_ref()
    .is_none_or(|tools| tools.iter().any(|tool| tool == "rustdoc"))

and x.py install compiler/rustc installs exactly that dist image. Before #667 tools was unset, so rustdoc shipped.

Effect: any cargo test that reaches doctests fails with could not execute process `rustdoc` … No such file or directory. Found moving build-servers to minimal main (gominimal/build-servers#373, which holds its pkgs pin at d5e98b3, #667's parent, until this lands).

Fix: add "rustdoc" to the list. Nothing else changes.

Cost: this changes rust's spec hash, so rust and everything built with it rebuild. Worth timing deliberately.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated Rust build tooling configuration to include the documentation tool required for documentation tests. This allows those tests to run as part of the configured build and verification workflows.

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• packages/rust/bootstrap.toml

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📝 Walkthrough

The Rust bootstrap configuration adds rustdoc to the configured tools list. Comments explain why src is omitted and why rustdoc is listed for doctests.

Changes: Rust bootstrap tools

Layer / File(s)	Summary
Configured Rust tools packages/rust/bootstrap.toml	The tools list adds rustdoc. Adjacent comments explain the omission of src and the need for rustdoc to run doctests.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Bug fix

Suggested reviewers: twitchyliquid64

Merge Risk: ⚪ Minimal · up to 72b91

This change restores rustdoc to the packaged toolset, allowing doctest workflows to find the executable. No remaining merge-blocking risk is established.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly describes the main change: adding rustdoc to bootstrap.toml so Rust ships the rustdoc binary again.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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