Create a new Rust project with cargo new and build, check, and run it
domain: doc.rust-lang.org · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Run `cargo new myproject` to create a binary crate (src/main.rs); use `--lib` for a library crate (src/lib.rs). Inside an existing directory use `cargo init`.
Defaults: edition = "2024" is written to Cargo.toml (override with `--edition <2015|2018|2021|2024>`); a git repo is initialized unless you pass `--vcs none` (also accepts hg, pijul, fossil).
Use `cargo check` for fast feedback: it type-checks without generating a binary, so it is much faster than a full build.
Run `cargo build` for a debug binary (lands in target/debug/), `cargo build --release` for an optimized binary (target/release/).
`cargo run` builds and runs in one step; `cargo run --release` for the optimized build. Pass program args after `--`: `cargo run -- <args>`.
Docs: https://doc.rust-lang.org/cargo/commands/cargo-new.html and https://doc.rust-lang.org/cargo/reference/manifest.html
Known gotchas
cargo check does not produce an executable — a passing `cargo check` still needs `cargo build` before you can run anything from target/.
Debug builds are unoptimized; never benchmark them. Always compare performance with --release builds.
`cargo new` inside an existing git repo still works but won't nest a new repo; pass `--vcs none` explicitly if you want to be sure no VCS files are created.
The default edition is 2024 on current stable toolchains — generated code may not compile on old rustc versions; pass `--edition 2021` if the project must build on older toolchains.
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