Problem: RustFBP is on nightly

[dmichiels]

Solution: seems that the global allocator is now a stable feature : https://blog.rust-lang.org/2018/08/02/Rust-1.28.html

We can theoretically move to stable.

[sjmackenzie]

Yes I noticed! That'll be a good step forward. I hope we can move onto the rust side of things as soon as we get something minimally working with the rkt hyperflow.

[sjmackenzie]

We'll need to sort out #277 before we can start in anger on the rust stuff.

[clacke]

At least nightly is pinned now, since #229 , so nothing will move under our feet.