Aaron Turon 92ccc073e1 Stabilize clone
This patch marks `clone` stable, as well as the `Clone` trait, but
leaves `clone_from` unstable. The latter will be decided by the beta.

The patch also marks most manual implementations of `Clone` as stable,
except where the APIs are otherwise deprecated or where there is
uncertainty about providing `Clone`.
2014-12-20 00:37:44 -08:00
..
2014-12-20 00:37:44 -08:00