How to Export Macros from a Crate in Rust

Add the #[macro_export] attribute above your macro_rules! definition to make the macro available to other crates that depend on yours.

#[macro_export]
macro_rules! vec {
    ( $( $x:expr ),* ) => {
        {
            let mut temp_vec = Vec::new();
            $(
                temp_vec.push($x);
            )*
            temp_vec
        }
    };
}

Exporting macros from a crate in Rust requires an attribute that treats your macro as a public tool for other projects. Without it, the macro stays hidden inside your library, like a private function. It is the standard way to share reusable code patterns across different Rust applications.