Radar · Rust · Archive · Week 13 · Mar 23 – 29, 2026

RFC header fixes (3721‑headers, 3148‑headers)

Nice to knowtooling

What changed: The RFC templates were updated to use Markdown 2nd‑level headings instead of level‑1 headings.
Production impact: The source does not say.
Try it: Open the rendered RFCs to see the new heading style.
Source: github.com/rust-lang/rfcs/pull/3937

Understand it, then run it

Rust RFCs are documents that describe language changes. The RFC template used to start each section with a level‑1 heading (#). Now the template uses level‑2 headings (##) for sections. This change only affects how the document looks; it does not change Rust code.

Run it now

Todayrust

// This program demonstrates that the change only affects RFC formatting,
// not Rust code.  It simply prints a message.
fn main() {
    println!("RFC heading levels are now level‑2; no code impact.");
}

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

RFC heading levels are now level‑2; no code impact.

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