Use slicing syntax for str/String

[nrc]

Need to implement ops::Slice

Happy to mentor.

[gamazeps]

On it :)

[steveklabnik]

We removed this for a reason, what's the justification for bringing this back?

[japaric]

We removed this for a reason

Did we? IIRC, we removed string indexing. But, we still have unsugared string slicing.

what's the justification for bringing this back?

I'd say that the main reason is that string[] is shorter than string.as_slice().

But I'm not sure about the usefulness of the sugared versions of the other three methods: slice, slice_from and slice_to.

[steveklabnik]

Oh oh, I was thinking of indexing. Carry on 😄

[gamazeps]

Arf, I've been too slow ^^