rustc

headstart is a set of rustc and cargo patches that emit crate metadata early (`.early-rmeta`) so dependent crates can start compiling against interface metadata while their dependencies are still type-checking function bodies, making clean `cargo check` builds up to 54% faster and `cargo build` up to 42% across 13 real-world Rust projects.

Sovereign Tech Fellow David Kolozsvari publishes his August–September 2026 open source maintenance report on the Rust toolchain, covering target directory size reductions, compile-time improvements, Polonius speedups, the parallel frontend, and various Rust infrastructure work.