Macros in Rust allow for syntactic abstraction by expanding code during early compilation. There are many common macros like assert!, concat!, format!, and println!. Macro definition uses macro_rules! to match and replace syntax. Repetition macros like $(...)* walk through repetitions in lockstep. Attributes like macro_export and macro_use control macro use and exporting. Debugging macros can be difficult.

1. Macros in Rust

2. @tobyhede
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3. @tobyhede
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4. Disclaimer

6. Macros

7. Syntactic Abstraction
expansion in early compilation

8. Many macros
assert!
concat!
format!
panic!
println!
try!

9. Hygeine
guaranteed
not to cause
accidental capture
of identifiers
syntax context

10. macro_rules!

12. Repetition

13. Repetition
$(...)* walks through one "layer" of repetitions, for all
of the $names it contains, in lockstep
each $name must be under at least as many $(…)* s as
it was matched against.

14. wat

17. Attributes
macro_export
macro_use

18. Debugging
hard

19. @tobyhede
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