2 #![allow(unused_must_use)]
4 use std::io::{Error, ErrorKind, Result};
7 fn foo(it: &mut Iter<u8>) -> Result<u8> {
8 Ok(*it.next().unwrap())
11 fn bar() -> Result<u8> {
12 let data: Vec<u8> = Vec::new();
15 return Err(Error::new(ErrorKind::NotFound, "msg"));
18 let mut it = data.iter();