libs: add Deref, DerefMut impls for references, fixing a bug in compiler in the process that was blocking this.

Fixes #18621.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs
index ac735492be4..2631d0d4423 100644
--- a/src/libcore/ops.rs
+++ b/src/libcore/ops.rs
@@ -805,6 +805,16 @@ pub trait Deref<Sized? Result> {
     fn deref<'a>(&'a self) -> &'a Result;
 }
 
+#[cfg(not(stage0))]
+impl<'a, Sized? T> Deref<T> for &'a T {
+    fn deref(&self) -> &T { *self }
+}
+
+#[cfg(not(stage0))]
+impl<'a, Sized? T> Deref<T> for &'a mut T {
+    fn deref(&self) -> &T { *self }
+}
+
 /**
  *
  * The `DerefMut` trait is used to specify the functionality of dereferencing
@@ -845,6 +855,11 @@ pub trait DerefMut<Sized? Result>: Deref<Result> {
     fn deref_mut<'a>(&'a mut self) -> &'a mut Result;
 }
 
+#[cfg(not(stage0))]
+impl<'a, Sized? T> DerefMut<T> for &'a mut T {
+    fn deref_mut(&mut self) -> &mut T { *self }
+}
+
 /// A version of the call operator that takes an immutable receiver.
 #[lang="fn"]
 pub trait Fn<Args,Result> {