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pub mod cursor;

pub mod prelude {
    pub use super::{
        Down, DownMut,
    };
}

#[cfg(test)]
mod tests;

pub trait Down {
    fn down(&self, idx: usize) -> Option<&Self>;
}

pub trait DownMut {
    fn down_mut(&mut self, idx: usize) -> Option<&mut Self>;
}