trait SpecFold: Iterator {
// Required method
fn fold<B, F>(self, init: B, f: F) -> B
where Self: Sized,
F: FnMut(B, Self::Item) -> B;
}
trait SpecFold: Iterator {
// Required method
fn fold<B, F>(self, init: B, f: F) -> B
where Self: Sized,
F: FnMut(B, Self::Item) -> B;
}