Suggest changing closure on E0593

[estebank]

Given a call that expects a closure that accepts arguments being passed a closure that takes no arguments:

fn main() {
    Some(()).into_iter().filter(|| false).collect();
}

we might want to suggest modifying the closure to take the argument and ignore it:

fn main() {
    Some(()).into_iter().filter(|_| false).collect();
}

---

How often would this suggestion be inappropriate?