Function closest 

pub fn closest<'a>(
    name: &str,
    candidates: impl IntoIterator<Item = &'a str>,
    max: usize,
) -> Vec<&'a str>

Up to max of candidates closest to name, best first: a different case, then a small spelling distance (at most a third of the name’s length, at least 2), then names that share the last dotted segment (layer.delete → edit.delete) or contain the name, then names that hold its letters in order. Empty when nothing is close.