Dev Stack
Tools This Week: October 10, 2026 - Python 3.15, Mold 3.0
Seven developer tools this week, led by Python 3.15.0 and the Rust rewrite of the Mold linker, with what each one changes and what it costs.
Rust news and analysis
Rust language news for working developers: stabilizations like the never type and the next-generation trait solver, compiler releases, crates.io supply-chain incidents and the migration decisions behind them. Each story explains the change in code terms and what to check before upgrading a toolchain.
Dev Stack
Chrome 155 turns on JPEG XL by default
Chrome 155 decodes JPEG XL images by default, using jxl-rs, a memory-safe Rust decoder. Firefox 158 is due to follow on October 13, 2026.
Dev Stack
YSERVER 1.7 adds Vulkan 1.2 and cuts 4K VRAM use
YSERVER 1.7 cuts 4K VRAM use from 2-4GB to about 1.2GB, near X.Org's 0.9GB, and adds Vulkan 1.2 support for older Intel graphics.
Dev Stack
Mold 3.0 ships its Rust rewrite as a drop-in linker
Mold 3.0 is the first release written in Rust. It needs Rust 1.95, drops Intel's oneTBB and links as fast as 2.42.1, the last C++ version.
Coding
Rust 1.100 drops host tools for 32-bit Windows targets
Rust 1.100 stops shipping the compiler for 32-bit Windows. The i686 targets keep the standard library, so cross-compiling from 64-bit Windows still works.
Coding
Rust 1.99 stabilizes C-variadic function definitions
Rust 1.99.0, out October 1, 2026, lets stable Rust define C-variadic functions like printf, moves to LLVM 23 and makes no_mangle on generics an error.
Coding
Python Language Summit 2026 debates Rust and a new GC
The Python Language Summit 2026 reports are out: 47 core developers weighed Rust in CPython, a new garbage collector, a std namespace and faster startup.
Coding
Rails World 2026: DHH says hand-written code is obsolete
DHH says he wrote 150,000 lines of code in August 2026 alone, versus 30,000 a year by hand, as 37signals rewrites Hey's mail server in Rust.
Dev Stack
COSMIC Epoch 1.9 adds image viewer, on-screen keyboard
COSMIC Epoch 1.9 shipped September 23, 2026, 13 days after 1.8, with a Rust image viewer, an on-screen keyboard and a redesigned app store.
Coding
Fearless SIMD 1.0 brings stable, safe SIMD to Rust
Fearless SIMD 1.0, released September 21, gives Rust safe SIMD from SSE2 to AVX-512, NEON and WebAssembly, with a stable API and 3 years of security fixes.
Dev Stack
Git 3.0 will default to SHA-256 and require Rust
Git 2.56-rc0 arrived on September 11, 2026, and the 3.0 release behind it switches new repositories to SHA-256, reftable and the main branch.
Coding
Rust warns maintainers about fake job video calls
Rust's security team says attackers are booking video calls with crate owners under fake job offers, then asking them to install a missing codec.
Dev Stack
Ubuntu 26.10 moves cp, mv and rm to Rust coreutils
Ubuntu 26.10 hands cp, mv and rm to Rust. A 113-issue audit held those three back from 26.04 LTS, and stable arrives October 15.
Coding
Rustls 0.23.45 fixes a TLS 1.3 flaw open since 2024
Versions 0.23.13 through 0.23.44 accepted TLS 1.3 handshake messages at the wrong encryption level, a bug introduced in September 2024.
Coding
Rust's never type, explained
Rust's never type, written !, is the type of code that never produces a value. It is stable in Rust 1.100 after ten years, and it changes type fallback.
Coding
Rust is now a tier-1 language at Microsoft
Microsoft made Rust a tier-1 language beside C++, C# and TypeScript. More than 100 of its repositories now build Rust code.
Dev Stack
Mold's Rust rewrite aims to be Linux's default linker
Mold links 4.9x faster than LLVM lld. Its author is rewriting it in Rust and wants distributions to install it as the default linker, /usr/bin/ld.
Dev Stack
COSMIC Epoch 1.8 ships tablet grab, Bluetooth renaming
COSMIC Epoch 1.8 shipped two weeks after 1.7 with tablet grab support and Bluetooth device renaming, but System76's own changelog is still pending.
Dev Stack
YSERVER 1.5 adds Reverse PRIME to its Rust X11 server
YSERVER 1.5, an X11 server written from scratch in Rust, adds Reverse PRIME multi-GPU support and 40 other fixes. Claude Code helped write its early code.
Coding
Rust funds six maintainers as Clippy's review backlog hits 300
The Rust Foundation Maintainers Fund is now paying six people to maintain Rust, backed by Google, AWS and OpenAI. Clippy's backlog sits near 300 pull requests.
Coding
Rust stabilizes the never type after ten years and five attempts
The never type is stable and Infallible is now an alias for it. The catch is a breaking change to type fallback that crater flagged on 3,277 crates.
Dev Stack
Firefox 157 will ship JPEG XL with a Rust decoder
Mozilla will enable JPEG XL by default in Firefox 157 at the end of September, but only after commissioning Google Research to rewrite the decoder in Rust.
Dev Stack
Cloudflare's Kitesurf is a browser built for AI agents, not people
Cloudflare built Kitesurf, an agent-first browser that runs in V8 isolates on Workers - 3-7x lighter than Chromium on CPU and memory, free in beta, Playwright-compatible.
Coding
Rust turns on its next-generation trait solver in nightly builds
Rust's new trait solver is now on by default in nightly - the largest compiler change since 1.0, four years in the making, with stabilization planned within months.
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