Const/Immutable Slicing Syntax

[Nordlöw via Digitalmars-d-learn]

What's the cleanest way of doing const or immutable slicing in D?

My first thought is

    cast((const typeof(x))x)[]
    cast((immutable typeof(x))x)[]

but that's too verbose for my/taste.

Is there a Phobos function for this?