2 files changed, 25 insertions, 0 deletions
diff --git a/src/libsyntax/ptr.rs b/src/libsyntax/ptr.rs
index 58750158931..15111bbba0a 100644
--- a/src/libsyntax/ptr.rs
+++ b/src/libsyntax/ptr.rs
@@ -43,6 +43,8 @@ use std::{mem, ptr, slice, vec};
 
 use serialize::{Encodable, Decodable, Encoder, Decoder};
 
+use rustc_data_structures::stable_hasher::{StableHasher, StableHasherResult,
+                                           HashStable};
 /// An owned smart pointer.
 #[derive(Hash, PartialEq, Eq, PartialOrd, Ord)]
 pub struct P<T: ?Sized> {
@@ -215,3 +217,13 @@ impl<T: Decodable> Decodable for P<[T]> {
         }))
     }
 }
+
+impl<CTX, T> HashStable<CTX> for P<T>
+    where T: ?Sized + HashStable<CTX>
+{
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          hcx: &mut CTX,
+                                          hasher: &mut StableHasher<W>) {
+        (**self).hash_stable(hcx, hasher);
+    }
+}
diff --git a/src/libsyntax/util/rc_slice.rs b/src/libsyntax/util/rc_slice.rs
index 195fb23f9d8..2d9fd7aa875 100644
--- a/src/libsyntax/util/rc_slice.rs
+++ b/src/libsyntax/util/rc_slice.rs
@@ -12,6 +12,9 @@ use std::fmt;
 use std::ops::Deref;
 use std::rc::Rc;
 
+use rustc_data_structures::stable_hasher::{StableHasher, StableHasherResult,
+                                           HashStable};
+
 #[derive(Clone)]
 pub struct RcSlice<T> {
     data: Rc<Box<[T]>>,
@@ -41,3 +44,13 @@ impl<T: fmt::Debug> fmt::Debug for RcSlice<T> {
         fmt::Debug::fmt(self.deref(), f)
     }
 }
+
+impl<CTX, T> HashStable<CTX> for RcSlice<T>
+    where T: HashStable<CTX>
+{
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          hcx: &mut CTX,
+                                          hasher: &mut StableHasher<W>) {
+        (**self).hash_stable(hcx, hasher);
+    }
+}