Hash is not implemented for array ([T; size])

[ExpHP]

Perhaps this is more of a wishlist item than anything, but here goes:
While some simple container types implement Hash, fixed-size arrays do not.

#[derive(Hash)]
struct Foo {
    a: Vec<bool>,
    b: (bool, bool),
    c: [bool; 2],
}

error: the trait `core::hash::Hash<__S>` is not implemented for the type `[bool; 2]`