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/prelude.rs b/src/libstd/prelude.rs
index dfe6988624e..61e8b63af35 100644
--- a/src/libstd/prelude.rs
+++ b/src/libstd/prelude.rs
@@ -37,6 +37,8 @@
 //! particularly useful standalone functions, like `from_str`, `range`, and
 //! `drop`, `spawn`, and `channel`.
 
+#![experimental]
+
 // Reexported core operators
 #[doc(no_inline)] pub use kinds::{Copy, Send, Sized, Share};
 #[doc(no_inline)] pub use ops::{Add, Sub, Mul, Div, Rem, Neg, Not};