- Packages: A Cargo feature that lets you build, test, and share crates
- Crates: A tree of modules that produces a library or executable
- Modules and use: Let you control the organization, scope, and privacy of paths
- Paths: A way of naming an item, such as a struct, function, or module
member inside mod is private by default, need a explicit pub to make it public accessible.
src
utils
bar.rs
foo.rs
utils.rs
main.rs