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Rust Feature Discussions

This cluster features comments discussing specific Rust programming language features, with users frequently sharing links to GitHub RFCs, issues, and pull requests to reference ongoing proposals, implementations, or debates on topics like traits, testing, compile-time checks, and more.

➡️ Stable 0.5x Programming Languages
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#1088
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Top Contributors

steveklabnik (274) tialaramex (119) kibwen (85) estebank (77) masklinn (57)

Keywords

e.g is.gd doc.rust play.rust trait.html Iterator.html lang.org docs.rs TreeMaps rustbyexample.com rust trait types type fn traits function validate error implement

Sample Comments

dbaupp • Dec 10, 2015 • View on HN

Yes, on the RFC: https://github.com/rust-lang/rfcs/pull/243#issuecomment-1633...

lowcoderev • Apr 1, 2023 • View on HN

Is that a feature specific to Rust? Can you please share any references to their official docs citing this?

steveklabnik • May 9, 2025 • View on HN

You may appreciate this RFC that was just opened https://github.com/rust-lang/rfcs/pull/3810

tus88 • Mar 10, 2020 • View on HN

You mean there is no compile time way to accomplish that? Doesn't sound very Rust-like.

dragonwriter • Apr 27, 2024 • View on HN

[text deleted because it was based on a incorrecf recollection of the details of Rust features.]

ameliaquining • Oct 16, 2025 • View on HN

Do you mean something like this? https://github.com/rust-lang/rfcs/issues/2407

jeffparsons • Oct 5, 2023 • View on HN

The recently-formed testing subteam is looking to solve your exact complaint: https://github.com/rust-lang/rfcs/pull/3455

steveklabnik • Dec 11, 2025 • View on HN

It's being worked on! https://github.com/rust-lang/rfcs/pull/3470

mkesper • Nov 21, 2016 • View on HN

Rust discussion of a similar feature: https://github.com/rust-lang/rust/issues/6676

kibwen • Mar 15, 2021 • View on HN

Here's Niko Matsakis' take: https://github.com/rust-lang/rust/issues/63818#issuecomment-...