Prepared `std::sys` for removal, and made `begin_unwind` simpler

- `begin_unwind` is now generic over any `T: Any + Send`.
- Every value you fail with gets boxed as an `~Any`.
- Because of implementation details, `&'static str` and `~str` are still
  handled specially behind the scenes.
- Changed the big macro source string in libsyntax to a raw string
  literal, and enabled doc comments there.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/libextra/extra.rs b/src/libextra/extra.rs
index 90434cf0d49..c6fc41e6831 100644
--- a/src/libextra/extra.rs
+++ b/src/libextra/extra.rs
@@ -118,6 +118,8 @@ pub mod extra {
     pub use std::clone;
     pub use std::condition;
     pub use std::cmp;
+    // NOTE: Remove import after next snapshot
+    #[cfg(stage0)]
     pub use std::sys;
     pub use std::unstable;
     pub use std::str;