pub trait HelloMacro {
    fn hello_macro();
}

/// Simplified version of the vec! macro
/// This is an example of a declarative macro
#[macro_export] // This makes the macro usable
macro_rules! vec {
    ( $( $x:expr ),* ) => { // This matches the argument list
        {
            let mut temp_vec = Vec::new();
            $(
                temp_vec.push($x);
            )*
            temp_vec
        }
    };
}