It is no longer possible to specialize on the `Hasher` because it moved
to a method-level type parameter.
/// A hashable type.
///
/// The `H` type parameter is an abstract hash state that is used by the `Hash`
-/// to compute the hash. Specific implementations of this trait may specialize
-/// for particular instances of `H` in order to be able to optimize the hashing
-/// behavior.
+/// to compute the hash.
#[stable(feature = "rust1", since = "1.0.0")]
pub trait Hash {
/// Feeds this value into the state given, updating the hasher as necessary.