[x] Hello World [x] Primitives [x] Custom Types [ ] Variable Bindings [ ] Types [ ] Conversion [ ] Expressions [ ] Flow of Control [ ] Functions [ ] Modules [ ] Crates [ ] Cargo [ ] Attributes [ ] Generics [ ] Scoping rules [ ] Traits [ ] macro_rules! [ ] Error handling [ ] Std library types [ ] Std misc [ ] Testing [ ] Unsafe Operations [ ] Compatibility [ ] Meta