What is rust-clippy?

Clippy is an official tool for the Rust programming language that checks your code for common mistakes, bad habits, and performance issues. When you write Rust code, the compiler catches errors that would stop the program from running, but Clippy goes further and flags problems that the compiler would let through, such as code that is technically valid but written in a confusing or inefficient way. It currently ships with over 800 individual checks. The checks are organized into categories. Some are turned on by default, like catching outright incorrect code or code that looks suspicious. Others are optional and stricter, such as the pedantic category, which can flag things that are perfectly reasonable in many contexts. You can tell Clippy which categories to warn about, which to treat as errors that stop a build, and which to ignore entirely. This gives you control over how strict the tool is on your project. Installing Clippy is straightforward if you use Rustup, which is the standard way to manage Rust installations. After installing Rustup and updating to a recent version of Rust, you add Clippy with one command and then run it with another. It integrates directly with Cargo, the standard Rust build and package manager, so it fits naturally into an existing project workflow. Clippy can also automatically fix some of the issues it finds, which saves time compared to manually rewriting flagged code. It works across single files, individual packages within a larger project, or an entire project at once. The tool is actively developed by the Rust team and community. It is included in the official Rust toolchain and is widely used as part of continuous integration setups to keep code quality consistent over time.