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Screenshot of makepad.github.io: Relax: JIT compiler for Rust to reduce build times

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Relax: JIT compiler for Rust to reduce build times

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Project page for Relax, an experimental live compiler and JIT runtime for Rust that runs Cargo packages from source without rustc or LLVM, with hot patching.

What HN thinks

Rust finally gets a REPL-ish loop, and Common Lisp quietly sips tea in the corner.

AI makes ambitious reimplementations feasible
Several note this is a largely Claude/Codex-built Rust reimplementation, an example of AI tackling huge but conceptually well-trodden projects, with some calling the code and website slop.
Fast edit-run loops are old ideas
Commenters point to Lisp, Bret Victor, and REPL-driven development, arguing fast iteration keeps getting rediscovered; others counter Rust's static typing and traits make this harder.
Why Rust builds are slow
Debate over causes: not mainly the borrow checker, but trait solving, LLVM optimization passes, and deep dependency trees from a small stdlib.

Consensus: Most agree faster iteration for Rust is valuable and that the borrow checker isn't the main cause of slow builds; opinions split on AI-generated code quality.

Recommended in the comments

rustd ↗ (tool): Offered as a similar iteration-focused Rust compiler.
blaze ↗ (tool): Listed as another viable fast-iteration Rust compiler.
kache (tool): Reported to speed up CI and local builds, caching more than sccache.
mr boxington ↗ (tool): A commenter said it has been a big help over several weeks.

Summarised by Claude from the comment thread 1 day ago.

Points: 170
Comments: 92
Best rank: #9
Posted: 2026-11-11 by adamnemecek
Category: Programming

rust jit-compiler makepad compilers hot-reloading developer-tools

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