No unsafe slicing

[cgaebel]

There's currently no version of slice, slice_from, slice_to, slice_mut, slice_from_mut, slice_to_mut, split_at that doesn't bounds check.

[kmcallister]

Is this still the case? It seems like a pretty big oversight if we claim to have C-like performance.

Nominating P-high, not 1.0.

[cgaebel]

This appears to still be the case.

[pnkfelix]

P-low, not 1.0; tagging as wishlist.

[nikomatsakis]

This is easy to workaround, so it doesn't seem especially high priority, but it would be nice to have.

[steveklabnik]

I'm pulling a massive triage effort to get us ready for 1.0. As part of this, I'm moving stuff that's wishlist-like to the RFCs repo, as that's where major new things should get discussed/prioritized.

This issue has been moved to the RFCs repo: rust-lang/rfcs#708