Rustacean Station

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What's New in Rust 1.81 through 1.84
Wednesday, 29 October, 2025

Jon and Ben discuss the highlights of the 1.81 through 1.84 releases of Rust. This episode was recorded as part of a YouTube live stream on 2025-10-26, which you can still watch. Contributing to Rustacean Station Rustacean Station is a community project; get in touch with us if you’d like to suggest an idea for an episode or offer your services as a host or audio editor! Twitter: @rustaceanfm Discord: Rustacean Station Github: @rustacean-station Email: hello@rustacean-station.org Timestamps & referenced resources [@01:58] - Rust 1.81 [@02:05] - core::error::Error Tracking issue for generic member access build-std Rust project goal [@08:27] - New sort implementations PR implementing the change Repo with the research [@10:49] - #[expect(lint)] [@14:37] - Lint reasons [@16:18] - Stabilized APIs [@16:34] - Duration::abs_diff [@17:25] - hint::assert_unchecked [@22:36] - fs::exists [@25:37] - Compatibility notes [@20:40] - Split panic hook and panic handler arguments [@23:00] - Abort on uncaught panics in extern "C" functions [@27:01] - WASI 0.1 target naming changed [@30:10] - Fix for CVE-2024-43402 CVE announcement [@33:39] - Rust 1.82 [@33:39] - cargo info [@35:06] - Apple target promotions Platform support tiers [@40:10] - Precise capturing use<..> syntax The Captures “trick” Talk on impl Trait [@47:24] - Native syntax for creating a raw pointer Pointers Are Complicated Pointers Are Complicated II Pointers Are Complicated III [@53:43] - Safe items with unsafe extern [@59:32] - Unsafe attributes [@1:03:44] - Omitting empty types in pattern matching The never type [@1:11:33] - Floating-point NaN semantics and const [@1:17:41] - Constants as assembly immediates [@1:19:06] - Safely addressing unsafe statics [@1:22:56] - Stabilized APIs [@1:23:03] - thread::Builder::spawn_unchecked [@1:25:10] - Working with MaybeUninit [@1:25:48] - Exposed SIMD intrinsics [@1:26:14] - Changelog deep-dive [@1:26:26] - Rewrite binary search implementation [@1:27:30] - Rust 1.83 [@1:27:55] - New const capabilities [@1:31:50] - Stabilized APIs [@1:32:06] - New io::ErrorKind variants [@1:33:10] - Option::get_or_insert_default [@1:34:56] - char::MIN [@1:35:48] - Changelog deep-dive [@1:35:48] - Unicode 16 Emoji [@1:39:51] - Sysroot trim-paths [@1:41:31] - cargo update informs of outdated versions [@1:42:43] - cargo --timings dark mode [@1:43:15] - Checksum-based freshness in Cargo nightly [@1:44:26] - Rust 1.84 [@1:44:40] - Cargo considers Rust version for dependency version selection [@1:49:03] - Migration to the new trait solver begins [@1:51:47] - Strict provenance APIs Pointers Are Complicated Pointers Are Complicated II Pointers Are Complicated III Rust has provenance Gankra’s write-up on raw pointer design Strict provenance APIs tracking issue [@1:57:53] - Stabilized APIs [@1:57:58] - <int>::isqrt [@1:58:15] - core::ptr::dangling [@1:59:15] - Changelog deep-dive [@1:59:15] - Include Cargo.lock in published crates [@2:00:12] - wasm32-wasi target removed [@2:01:06] - &raw *invalid_ptr is fine Credits Intro Theme: Aerocity Audio Editing: synchis Hosting Infrastructure: Jon Gjengset Show Notes: Jon Gjengset Hosts: Jon Gjengset and Ben Striegel