Radar · Rust · Archive · Week 52 · Dec 22 – 28, 2025
Rustup 1.29.0 beta: Call for Testing!
Worth knowingtooling
- What changed
- The Rustup team released version 1.29.0 as a beta and invited the community to test it.
- Production impact
- The source does not say.
- Try it
- Run
rustup --versionafter installing the beta to verify the new version is active. - Source
- blog.rust-lang.org/inside-rust/2025/12/20/rustup-1.29.0-beta-cft/
Understand it, then run it
Rustup 1.29.0 beta introduces the ability to download toolchain components concurrently and to unpack them while they are still downloading. Before this, each component was fetched one after another, which could take a long time on slow connections. With the new change, rustup can start downloading several components at the same time and can begin extracting them before the download finishes. This makes updating or installing a toolchain noticeably faster.
Run it now
// This program demonstrates that concurrent downloads are a beta feature
// of rustup 1.29.0 and are not available in Rust 1.98.1 (edition 2024).
// It simply prints a message confirming the absence of that feature.
fn main() {
println!("Concurrent downloads are a beta feature of rustup 1.29.0 and are not available in Rust 1.98.1 (edition 2024).");
}
What it printed when we ran it on Rust 1.98.1 (edition 2024)
Concurrent downloads are a beta feature of rustup 1.29.0 and are not available in Rust 1.98.1 (edition 2024).
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