October 29, 2025

What's New in Rust 1.81 through 1.84

2 hours 3 minutes

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: [email protected]

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[@1:41:31] - cargo update informs of outdated versions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] - ::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

...more

View all episodes

By Rustacean Station

4.9

6464 ratings

October 29, 2025

What's New in Rust 1.81 through 1.84

2 hours 3 minutes

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: [email protected]

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] - ::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

...more

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What's New in Rust 1.81 through 1.84

What's New in Rust 1.81 through 1.84

More shows like Rustacean Station

Odd Lots

The Changelog: Software Development, Open Source

Security Now (Audio)

Software Engineering Daily

Risky Business

Talk Python To Me

The Quanta Podcast

Syntax - Tasty Web Development Treats

Darknet Diaries

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

Hard Fork

Oxide and Friends

Past Present Future

Rust in Production

The Pragmatic Engineer