#[macro_export]
macro_rules! err_or_cont {
    ($expr:expr) => {
        match $expr {
            Ok(n) => n,
            Err(_) => continue,
        }
    };
}
#[macro_export]
macro_rules! some_or_cont {
    ($expr:expr) => {
        match $expr {
            Some(n) => n,
            None => continue,
        }
    };
}