Simple proc-macro for enabling rust main function to return an exit status code.
#[exit_status::main]
fn main() -> anyhow::Result<i32> {
Ok(0)
}
// expands to
// fn main() -> anyhow::Result<()> {
// fn inner_main() -> anyhow::Result<i32> {
// {
// Ok(0)
// }
// }
// std::process::exit(inner_main()?);
// }