libstd: set baseline stability levels.

Earlier commits have established a baseline of `experimental` stability
for all crates under the facade (so their contents are considered
experimental within libstd). Since `experimental` is `allow` by
default, we should use the same baseline stability for libstd itself.

This commit adds `experimental` tags to all of the modules defined in
`std`, and `unstable` to `std` itself.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libstd/sync/mod.rs b/src/libstd/sync/mod.rs
index 5f45ce25502..cc32818baa4 100644
--- a/src/libstd/sync/mod.rs
+++ b/src/libstd/sync/mod.rs
@@ -15,6 +15,8 @@
 //! and/or blocking at all, but rather provide the necessary tools to build
 //! other types of concurrent primitives.
 
+#![experimental]
+
 pub use core_sync::{atomics, deque, mpmc_bounded_queue, mpsc_queue, spsc_queue};
 pub use core_sync::{Arc, Weak, Mutex, MutexGuard, Condvar, Barrier};
 pub use core_sync::{RWLock, RWLockReadGuard, RWLockWriteGuard};