Add the DerefImm and DerefMut traits.

2 files changed, 23 insertions, 1 deletions

diff --git a/src/libstd/ops.rs b/src/libstd/ops.rs
index ac329e6fe83..2d5d37e1abc 100644
--- a/src/libstd/ops.rs
+++ b/src/libstd/ops.rs
@@ -464,6 +464,28 @@ pub trait Index<Index,Result> {
     fn index(&self, index: &Index) -> Result;
 }
 
+#[cfg(stage0)]
+pub trait Deref<Result> {
+    fn deref<'a>(&'a self) -> &'a Result;
+}
+
+#[cfg(not(stage0))]
+#[lang="deref"]
+pub trait Deref<Result> {
+    fn deref<'a>(&'a self) -> &'a Result;
+}
+
+#[cfg(stage0)]
+pub trait DerefMut<Result>: Deref<Result> {
+    fn deref_mut<'a>(&'a mut self) -> &'a mut Result;
+}
+
+#[cfg(not(stage0))]
+#[lang="deref_mut"]
+pub trait DerefMut<Result>: Deref<Result> {
+    fn deref_mut<'a>(&'a mut self) -> &'a mut Result;
+}
+
 #[cfg(test)]
 mod bench {
     extern crate test;
diff --git a/src/libstd/prelude.rs b/src/libstd/prelude.rs
index 5ea00c2f67d..531833acfb1 100644
--- a/src/libstd/prelude.rs
+++ b/src/libstd/prelude.rs
@@ -23,7 +23,7 @@ generally useful to many Rust programs.
 pub use kinds::{Freeze, Pod, Send, Sized};
 pub use ops::{Add, Sub, Mul, Div, Rem, Neg, Not};
 pub use ops::{BitAnd, BitOr, BitXor};
-pub use ops::{Drop};
+pub use ops::{Drop, Deref, DerefMut};
 pub use ops::{Shl, Shr, Index};
 pub use option::{Option, Some, None};
 pub use result::{Result, Ok, Err};