Cargo-pup – ArchUnit-style linting for rust

Hacker News

Hey HN! I’ve been working on cargo-pup, a Rust tool for defining and enforcing architectural rules in your codebase - like ArchUnit for Java, or Clippy, but for project-specific architecture constraints rather than linting. It lets you write architectural assertions in Rust using a builder-style API. For example: Enforce layering: "REST modules shouldn’t use SQL clients" Enforce consistency: "Types implementing MyTrait must be named MyTrait and live in Impl* modules" Pup emits regular rustc lints (just like Clippy or cargo check) and runs either as a test or via a `cargo pup` CLI, the latter of which you can drop into your CI. This is very early days! I work at Datadog, but this isn’t an official project — just something I built to explore what architectural linting might look like in Rust, and to scratch my own itch :) Would love any feedback or questions! Scott

Visit product View on Hacker NewsJul 22, 2025

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Product HuntOn track for Day 1 leaderboard · Strong signals: using, code · Missing: mac, agents, macos

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Indie HackersFits the IH revenue-focused audience · Missing: supports, reddit linkedin, podcasting

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Hacker NewsMay not resonate with HN audience · Strong signals: io · Missing: https docs, excited, just released

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TrustMRRLess likely to generate early MRR · Missing: mobile apps, ios, personal

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AppSumoMay struggle as an AppSumo deal · Strong signals: builder · Missing: plus, platform, intuitive

46%46% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue

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