What's New in Rust 1.81 through 1.84

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.

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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Changelog deep-dive [@1:35:48] - Unicode 16 Emoji [@1:39:51] - Sysroot trim-paths [@1:41:31] - cargo update informs of outdated versions [@1:42:43] - cargo --timings dark mode [@1:43:15] - Checksum-based freshness in Cargo nightly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