Rust's macro system is very powerful, but also kind of difficult to wrap your head around. We're not going to teach you how to write your own fully-featured macros. Instead, we'll show you how to use and create them.

If you'd like to learn more about writing your own macros, the macrokata project has a similar style of exercises to Rustlings, but is all about learning to write Macros.

Further information

Macros
The Little Book of Rust Macros