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Why 'externalized' proofs of cyclic trait impls does not work
Niko Matsakis compares modular proofs, where an impl must establish its supertraits, with external proofs, where users of the impl carry that obligation, and argues that external proofs are incompatible with Rust as designed, so cyclic trait impls require a modular strategy.
7 min · 1,585 words
August in Servo: CSS Grid, text selection, and more!Plus accessibility and navigation improvements.
The Servo project's monthly update covering Servo 0.6.0 and 417 commits landed in August: CSS Grid enabled by default, new web platform features and DOM APIs, text selection, accessibility, navigation and session-history fixes, a SpiderMonkey upgrade, embedding API changes and performance work.
9 min · 2,143 words
Voxlocal: a minimal voice agent written in Rust
Sam Khawase walks through building Voxlocal, a minimal local voice agent in Rust, explaining each stage of the pipeline from audio capture and Whisper speech recognition through text normalization, embeddings and retrieval, LLM tool routing and Piper speech synthesis, and measuring where the time goes.
13 min · 3,024 words
Purplesyringa shows how to compute count-leading-zeros and count-trailing-zeros with floating-point bit tricks instead of native instructions, yielding a vectorizable polyfill in Rust, and explains why the exponent manipulation works.
4 min · 891 words
Prime Intellect describes how Prime Agent orchestrated a swarm of over 2,000 agents across 10,000+ Prime Sandboxes and 200 billion tokens to rewrite itself from TypeScript to Rust in two weeks, covering why Rust, finite-state-machine orchestration, architecture redesign, and cold start, memory and install-size gains.
9 min · 2,133 words
Thanks to 227 contributors, 817 pull requests, community reviewers, and our generous donors, we're happy to announce the Bevy 0.20 release on crates.io!
23 min · 5,381 words
A guide to the C programming language written from the perspective of someone who learned Rust first. BD103 walks through the surprising and unexpected parts of C for Rust programmers, including booleans and headers, strings and pointer lengths, integer types like size_t, the arrow operator, and the memory safety pitfalls Rust usually prevents.
9 min · 2,046 words
The Missing Piece in Rust Error Handling
Rust already offers explicit control flow, errors as values and concise propagation with ?, but choosing what goes in the error half of Result forces a trade-off between precise types with boilerplate and convenient types that hide which errors can occur. The post argues error types should compose as easily as the functions that return them.
7 min · 1,660 words
Burn 0.22.0: Faster Builds, Easier Extensions, and Smarter Autotuning
Tracel's Burn 0.22 deep learning framework for Rust removes backend type parameters from user code, selecting execution through the device, which made rebuilds up to 15x faster in their tests. It also adds adaptive memory management, smarter autotuning, GPU graph replay, a reusable CubeCL Environment cache, LoRA and QLoRA fine-tuning, ONNX export and expanded remote compute.
12 min · 2,837 words
tapo speaks TPAP: Third-Party Compatibility can stay off
Mihai Dinculescu explains how v0.11.1 of tapo, his unofficial Rust and Python client for TP-Link Tapo devices, now logs in over TP-Link's TPAP protocol so users no longer need the Third-Party Compatibility switch, and covers new H200/H500 camera hub recording downloads plus plug schedules and timers.
10 min · 2,290 words
mold 3.0.0 is the first release of the high-speed linker after its rewrite from C++ to Rust: a drop-in replacement for 2.42.1 with the same options, targets, and linking performance, bounds-checked reads on corrupted input, a Cargo-based build, and a long list of bug fixes and compatibility improvements across architectures.
5 min · 1,254 words
The Performance Cost of RwLock in Our Read-Heavy Workload
A write-up of how per-item RwLock reads became expensive in a read-heavy service, how moving to lock-free structures avoided the overhead of acquiring thousands of read locks, and where a simple RwLock around a larger block still worked well. The takeaway: where and how often synchronization happens matters as much as the choice of primitive.
6 min · 1,303 words
Property Testing with Agent Swarms
Inanna Malick shows how to have coding agents build property-testing machinery (reference models, generators and assertions) for a repo, then turn the failures into small, reviewable fixes. Pointed at OpenAI's Codex, the public playbook found thirteen distinct correctness bugs, and runs on jj, uv, Prometheus and Babel produced merged upstream fixes.
6 min · 1,325 words
Async Rust: Where does the scheduler live?
Mond opens with an async Rust complaints bingo card and reading list, then argues that the real discomfort is that async Rust needs a runtime, while concurrency always requires a scheduler somewhere, and weighs Zig's approach of passing the I/O implementation as a parameter as a direction worth trying.
17 min · 3,872 words
TIL: Rust's derive often implies inline
A short TIL noting that Rust’s derived trait impls commonly emit #[inline], with practical implications for Debug/Clone cost and when custom non-inlined derives can help.
3 min · 634 words
Demoting i686 Windows targets to std-only
The Rust compiler team announces that with Rust 1.100.0 the i686-pc-windows-msvc and i686-pc-windows-gnu targets lose host tools: the standard library is still shipped, but 32-bit Windows binaries must be cross-compiled from a supported host such as 64-bit Windows.
1 min · 304 words
Back in June of 2024 at RustFest Zürich, the Const Generics project group first discussed a new design for supporting more complex uses of generic parameters in Const Generics. Since then, we've continued to refine the initial design and have implemented the new design as a family of features dubbed "Generic Const Arguments" (GCA for short).
11 min · 2,501 words
Driving the GDEH0154D67 e-paper display with Rust
Hands-on Rust notes for driving a GDEH0154D67 e-paper panel—starting from a Watchy/ESP32 hack project, covering the display protocol, refresh quirks, and a working driver approach.
9 min · 2,066 words
The Rust team announces Rust 1.99.0 with the usual rustup upgrade path and release notes covering language, library, and tooling changes.
2 min · 440 words
How to speed up the Rust compiler in September 2026
How to speed up the Rust compiler in September 2026 My last post](https://nnethercote.github.io/2026/07/31/how-to-speed-up-the-rust-compiler-in-july-2026.html) on the Rust compiler’s performance was two months ago and a lot has happened since then. Overall progress The measurements for the period 2026-07-29 to 2026-09-28 can be seen here](https://perf.rust-lang.org/compare.html?start=1a833e16546c2eb012758ddd499964fd8afee29e&stat=wall-time&tab=compile&end=c1070d69382b8d2f2eb65119c738a77d9e324c9e&
5 min · 1,212 words