How do I tell Cargo to build files other than main.rs?

Question

Here is my directory structure:

lowks@lowkster ~/src/rustlang/gettingrusty $ tree . . ├── Cargo.lock ├── Cargo.toml ├── foo.txt ├── src │   ├── boolean_example.rs │   ├── function_goodbye_world.rs │   ├── listdir.rs │   ├── looping.rs │   ├── main.rs │   ├── pattern_match.rs │   └── write_to_file.rs └── target     ├── build     ├── deps     ├── examples     ├── gettingrusty     └── native  6 directories, 11 files 

When I run 'cargo build', it seems to only build main.rs. How should I change Cargo.toml to build the rest of the files too?

Answer 1

Put other.rs file into bin subfolder of src folder (./src/bin/other.rs). And run cargo build --bin other or cargo run --bin other

Answer 2

The Rust compiler compiles all the files at the same time to build a crate, which is either an executable or a library. To add files to your crate, add mod items to your crate root (here, main.rs) or to other modules:

mod boolean_example; mod function_goodbye_world; mod listdir; mod looping; mod pattern_match; mod write_to_file; 

To access items defined in another module from your crate root, you must qualify that item with the module name. For example, if you have a function named foo in module looping, you must refer to it as looping::foo.

You can also add use statements to import names in the module's scope. For example, if you add use looping::foo;, then you can just use foo to refer to looping::foo.

For more information, see Separating Modules into Different Files in The Rust Programming Language.