rust-upstream

name	rust-upstream
description	Authoritative reference to the upstream Rust language and standard library (github.com/rust-lang/rust). Use when you need ground-truth on std APIs, language semantics, edition behavior, Tokio-adjacent patterns, or when a Maestro Rust question cannot be answered from local code alone.

Rust Upstream Skill

Ground-truth reference for the Rust language and standard library used by Maestro's core.

Authoritative source

• Repo: [e-mail]:rust-lang/rust.git — https://github.com/rust-lang/rust
• Use it (via github_repo / fetch_webpage) to confirm std API signatures, stabilization status, edition semantics, and idiomatic patterns before relying on memory.

When to apply

• Verifying a std / core / alloc API shape, trait bound, or MSRV/edition behavior.
• Resolving borrow-checker, lifetime, async-trait, or ?-propagation questions.
• Choosing idiomatic error types (thiserror in domain/application, anyhow at the CLI boundary).

How to use it in Maestro

• Prefer local conventions first: docs/Maestro_Manifesto/CONVENTIONS.md and the rust skill.
• Only reach upstream when local sources are insufficient; cite the exact upstream path/permalink.
• Never copy nightly-only or unstable APIs into Maestro — stable toolchain only.

Guardrails

• No unwrap/expect/panic! in normal paths; Arc<tokio::sync::RwLock<T>> for shared async state.
• Keep domain/ free of I/O and provider SDKs regardless of upstream examples.