21.macros

macros1.rs

// macros1.rs
//
// Execute `rustlings hint macros1` or use the `hint` watch subcommand for a
// hint.


macro_rules! my_macro {
    () => {
        println!("Check out my macro!");
    };
}

fn main() {
    my_macro!();
}

macros2.rs

Github solution link

// macros2.rs
//
// Execute `rustlings hint macros2` or use the `hint` watch subcommand for a
// hint.


macro_rules! my_macro {
    () => {
        println!("Check out my macro!");
    };
}

fn main() {
    my_macro!();
}

macros3.rs

Github solution link

// macros3.rs
//
// Make me compile, without taking the macro out of the module!
//
// Execute `rustlings hint macros3` or use the `hint` watch subcommand for a
// hint.


#[macro_use]
mod macros {
    macro_rules! my_macro {
        () => {
            println!("Check out my macro!");
        };
    }
}

fn main() {
    my_macro!();
}

macros4.rs

Github solution link

// macros4.rs
//
// Execute `rustlings hint macros4` or use the `hint` watch subcommand for a
// hint.


#[rustfmt::skip]
macro_rules! my_macro {
    () => {
        println!("Check out my macro!");
    };
    ($val:expr) => {
        println!("Look at this other macro: {}", $val);
    };
}

fn main() {
    my_macro!();
    my_macro!(7777);
}