Filesystem Hierarchy

The module content can be omitted:

mod garden;

The garden module content is found at:

• src/garden.rs (modern Rust 2018 style)
• src/garden/mod.rs (older Rust 2015 style)

Similarly, a garden::vegetables module can be found at:

• src/garden/vegetables.rs (modern Rust 2018 style)
• src/garden/vegetables/mod.rs (older Rust 2015 style)

The crate root is in:

• src/lib.rs (for a library crate)
• src/main.rs (for a binary crate)