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Radar · Rust · Archive · Week 11 · Mar 9 – 15, 2026

Call for Testing: Build Dir Layout v2

Nice to knowtooling

What changed
The Rust team is seeking testers for a new build directory layout proposal.
Production impact
The source does not say.
Try it
Read the proposal and consider how it might affect your build scripts.
Source
blog.rust-lang.org/2026/03/13/call-for-testing-build-dir-layout-v2/

Understand it, then run it

Run it now

Todayrust
// This program demonstrates that the nightly-only `-Zbuild-dir-new-layout`
// feature is not available in Rust 1.98.1 (edition 2024).  It simply prints
// a message confirming that the feature flag is ignored.
fn main() {
    println!("Cargo will write temporary files to: build-dir (default)");
}

What it printed when we ran it on Rust 1.98.1 (edition 2024)

Cargo will write temporary files to: build-dir (default)

Run sends this program (for Solidity, the contract and its tests) to our own sandbox, where it is compiled and run once, with no network, and what it printed or the test report comes back here. Nothing is kept. Runs are counted per visitor for the day so everyone gets a turn; the details are on the legal page.

Written by gpt-oss-20b from the linked source · claims checked against the sources · archive, not individually reviewed