Rust Builds Wait on Function Bodies Nobody Downstream Reads. A Patch Series Stops Waiting

Mon, 05 Oct 2026 09:00:00 +0530

Cargo makes a crate wait until each of its dependencies has been fully checked, function bodies included, before it starts. But a dependent compiles against a dependency’s interface, the signatures, types and trait impls in its .rmeta file. It does not need to know that the bodies type-check. A patch series published this week, headstart, removes that wait for rustc and cargo, and the way it does so says a lot about what a Rust dependency edge actually carries.

Build-Systems on Kuldeep Pisda

Rust Builds Wait on Function Bodies Nobody Downstream Reads. A Patch Series Stops Waiting