rustlings/macros/macros3.rs

75 lines
574 B
Rust
Raw Normal View History

2017-03-17 14:30:29 +00:00
// Make me compile, without taking the macro out of the module! Scroll down for hints :)
mod macros {
macro_rules! my_macro {
() => {
println!("Check out my macro!");
};
}
}
fn main() {
my_macro!();
}
// In order to use a macro outside of its module, you need to do something special to the module to
// lift the macro out into its parent.
// The same trick also works on "extern crate" statements for crates that have exported macros, if
// you've seen any of those around.