Understanding the Mismatch: Expected Option<String> vs Option<()>

I'm learning Rust and recently ran into something unexpected with Option type. I expected r to be Option, but it came back as Option instead. Here's what I tried: let mut vds = VecDeque::from(["a".to_owned(), "b".to_owned()]); let r = vds .get_mut(0) .and_then(|v| Some(*v = String::from("Hello")));

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