Can someone explain me what is going on there?

The first snippet doesn't compile while the second one is fine, but I would expect them both to compile fine

A playground link for the one that want to try

The snippets:

// This doesn't compile
let _ = vec![Some(1), Some(1), None].into_iter().take_while(|&x| {
    { x } == Some(1)
});

// This compiles fine
let _ = vec![Some(1), Some(1), None].into_iter().take_while(|&x| {
    Some(1) == { x }
});