.
├── Cargo.lock
├── Cargo.toml
├── src/
│ ├── lib.rs # The default library file is src/lib.rs.
│ ├── main.rs # The default executable file is src/main.rs.
│ └── bin/ # Other executables can be placed in src/bin/,
│ ├── named-executable.rs # even in library projects.
│ ├── another-executable.rs
│ └── multi-file-executable/
│ ├── main.rs
│ └── some_module.rs
├── benches/
│ ├── large-input.rs
│ └── multi-file-bench/
│ ├── main.rs
│ └── bench_module.rs
├── examples/
│ ├── simple.rs # cargo run --example simple
│ └── multi-file-example/
│ ├── main.rs
│ └── ex_module.rs
└── tests/ # Integration tests go in the tests directory.
├── some-integration-tests.rs # Tests in your src files should be unit tests
└── multi-file-test/ # and documentation tests.
├── main.rs
└── test_module.rs
- A package is a bundle of one or more crates - as defined by a
Cargo.toml file
- A crate is the smallest amount of code that the Rust compiler considers at a time.
- A crate can come in one of two forms: a binary crate (must have a function called
main) or a library crate.
- A package can contain as many binary crates as you like, but at most only one library crate.
- If a package contains src/main.rs and src/lib.rs, it has two crates: a binary and a library, both with the same name as the package.