Unbug – Rust macros for programmatically invoking breakpoints
This project is inspired by some of the asserts in Unreal engine. Due to reliance on core_intrinsics it is necessary to develop using nightly Rust, but there are stubs in place so a production build will not require nightly. I recently released version 0.2 which includes no_std support and adds optional log message arguments to the ensure macro.
Unbug – Rust macros for programmatically invoking breakpoints launched on November 20, 2024 with 96 votes, #436 of 4,990 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Unbug provides Rust macros that programmatically invoke breakpoints during development, inspired by Unreal Engine's assertion system. Developers can use nightly Rust for development while production builds work with stable Rust through provided stubs. Version 0.2 adds no_std support and optional log message arguments to the ensure macro, making it suitable for debugging in both standard and embedded Rust environments.
written from the facts on this page · September 2026
From the sources
Debug breakpoint assertions for Rust. Contribute to greymattergames/unbug development by creating an account on GitHub.
These macros are designed to help developers catch errors during debugging sessions that would otherwise be a panic (which may not be desirable in certain contexts) or simply a log message (which may go unnoticed). Shims are provided so breakpoints will not be compiled in release builds. This means that the macros in this crate can be used freely throughout your code without having to conditionally compile them out yourself. Unbug was developed for our upcoming multiplayer automation game,from github.com
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