mod.rs and nested modules in Rust
rust
Solution
When you write curly braces in a `mod` item, that tells the compiler that the module's contents are within these braces, not in an external file. Thus, the compiler doesn't even look at `engine/mod.rs`. When you write a semicolon instead, the compiler will look for an external file.
What you need to do instead is put these lines in `engine/mod.rs`:
pub mod random;
pub mod dummy;
And in `lib.rs`, write:
pub mod engine;
Problem
I want to specify a generic trait `Engine` and provide two different implementations: `Random` and `Dummy`. I want to use following file structure: ``` src- |-engine |-mod.rs //contains Engine trait code |-random.rs // contains first engine implementation |-dummy.rs // contains second engine implementation ``` I have something like this in lib.rs: ``` pub mod engine { // random moves engine pub mod random; pub mod dummy; } ``` When I try to add `use engine::Engine` anywhere in my other modules, it can't be found: ``` error[E0432]: unresolved import `engine::Engine` ```