Unexpected keyword use #38

fn parse_data(data: &str) -> impl Iterator<Item = Vec<isize>> +  use<'_> {
    data.lines().map(|x| {
        x.split_ascii_whitespace()
            .map(|y| { y.parse::<isize>().expect("I thought this was a number") })
            .collect::<Vec<isize>>()
    })
}

fn parse_data(data: &str) -> impl Iterator<Item = Vec<isize>> +  use<'_> {
    data.lines().map(|x| {
        x.split_ascii_whitespace()
            .map(|y| { y.parse::<isize>().expect("I thought this was a number") })
            .collect::<Vec<isize>>()
    })
}