Why does this produce an endless iterator over just the first char in the str?

fn main() {
    let name = "string".to_string();
    let n = name.as_str();
    while let Some(item) = n.chars().next() {
        println!("{}", item)
    }
}

(Playground)

I would have expected next() to actually move onto the next char, but it never does.

replacing with a simple 'for c in n.chars()" solves the issue

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