[pornel]

If you want to, you can easily make a project comprised of many modules and using only one file (or zero files)

Creating a single module from many files is also possible. It can be done with clumsy C-style includes, or more idiomatically composed from `pub use` of items from private modules. `impl` blocks can be anywhere.

The point is, files and modules are decoupled. Files just happen to be a convenient default for modules, but they aren't semantically special in Rust. There's no syntax or privacy boundary specific to files.

) Cargo.toml with `[lib] path = "/dev/stdin"` + `echo 'fn main() {}' | cargo build` happens to work :)