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TIL: RangeFrom/`0..` in Rust wraps instead of ending at the ::MAX value? fn main() { for idx in (0u8..).take(257) { println!("{:02X}", idx); } } play.rust-lang.org?version=stab...

play.rust-lang.orgRust PlaygroundA browser interface to the Rust compiler to experiment with the language

Victorien Elvinger

@conaclos.bsky.social

17 Dec 2025

This could make an excellent case for a Clippy lint rule :)

James Munns

@jamesmunns.com

17 Dec 2025

I did suggest that! github.com/rust-lang/ru...

github.comNo warning for open range loop · Issue #150084 · rust-lang/rustCode fn main() { for idx in 0u8.. { println!("{:02X}", idx); } // not unreachable! func(); } // no `clippy::infinite_loop` lint! fn func() { for idx in 0u8.. { println!("{:02X}", idx); } } Current ...

Erk

@erk.dev

I made a simple implementation specifically for for loops github.com/rust-lang/ru...

github.comadd new lint: `for_unbounded_range` by Erk- · Pull Request #16257 · rust-lang/rust-clippyThis adds a Clippy lint for the possible confusing behaviour pointed out in rust-lang/rust#150084 and rust-lang/rust#111514, and discussed in rust-lang/libs-team#304. While no consensus have been r...

18/12/25, 10:19 am0 reposts7 likes

James Munns

@jamesmunns.com

18 Dec 2025

Hell yeah, that's awesome!