pub trait Hasher<S> {
fn hash<T: Hash<S>>(&self, value: &T) -> u64;
}A trait that computes a hash for a value. The main users of this trait are
containers like HashMap, which need a generic way hash multiple types.
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).