- [x] Backtrackable and non-backtrackable global variables via `bb_get/2`
`bb_put/2` (non-backtrackable) and `bb_b_put/2`
(backtrackable).
-- [ ] clp(B) and clp($\mathbb{Z}$) as builtin libraries (_in progress_).
+- [ ] clp(B) and clp(ℤ) as builtin libraries (_in progress_).
- [ ] Streams and predicates for stream control (_in progress_).
- [ ] An incremental compacting garbage collector satisfying the five
properties of "Precise Garbage Collection in Prolog."
```
The user listing can also be terminated by placing `end_of_file.` at
-the end of the stream.
\ No newline at end of file
+the end of the stream.