use std::error::Error as StdError;
use std::result::Result as StdResult;
type Result<T> = StdResult<T, Box<StdError>>;

fn main() -> Result<()> {
    let foo = &[];
    let bar: &[u8] = &[];
    let () = foo;   // foo is [{integer}; 0]-- an array(!), not a slice
    let () = bar;   // bar is a slice; what's up with foo?
    Ok(())
}