Add initial support for unsized method resolution

In order to support slices, we end up with an operator overload call of:

```
impl<T, I> Index<I> for [T]
where
    I: SliceIndex<[T]>,
{
    type Output = I::Output;

    fn index(&self, index: I) -> &I::Output {
        index.index(self)
    }
}
```

So this means the self in this case is an array[T,capacity] and the index parameter is of type Range<usize>. In order to actually call this method
which has a self parameter of [T] we need to be able to 'unsize' the array
into a slice.

Addresses #849

0 files changed, 0 insertions, 0 deletions