Rust weirdness

partial.rs

// This does not work without the move marker. The reason for that is that the lifetime for `a`
// only covers the scope of the outer function, which does not extend to the scope of the inner
// function, which is returned from the outer function.
fn main() {
    let x = |a| move |b| a + b;
    let y = x(5);
    let z = y(5);

    println!("{}", z); // prints 10
}