clippy-custom

Custom Clippy lints are implemented as lint passes within the Clippy toolchain. You define a struct that implements Clippy's lint trait, specify detection logic for the pattern you want to flag, and register it with Clippy's lint registry. This lets you enforce project-specific code quality rules across your Rust codebase.

Clippy lints are tested by writing Rust code samples that should and shouldn't trigger the lint, then verifying the lint produces expected warnings and errors. The testing framework validates lint output format, correctness of suggestions, and edge cases before publishing or deploying to CI workflows.

Yes. Custom lint crates can be packaged and published to crates.io as standalone crates. Users then integrate your lint into their projects by adding your crate as a dependency and configuring Clippy to load it, enabling distributed reuse of domain-specific or organization-specific linting rules.

Integrate custom lints into CI by configuring Clippy to load your lint crate, then run `cargo clippy` as part of your build checks. Clippy will apply all registered lints—both built-in and custom—during compilation, catching violations before code merges.

You should understand Rust's syntax and AST structure, Clippy's lint framework and trait API, and pattern-matching techniques for detecting code patterns. Familiarity with the Clippy codebase and lint pass architecture accelerates development of robust, maintainable lints.

Custom lints apply to any Rust project that adds your lint crate as a dependency and enables it in Clippy configuration. Lints function across library and binary projects, though you tailor lint logic—like flagging unwrap() in libraries but not binaries—to match project context.