From c47cdc0d93726429ee18b418b1f85fae67b82d41 Mon Sep 17 00:00:00 2001
From: Michael Woerister <michaelwoerister@posteo.net>
Date: Thu, 30 Mar 2017 15:27:27 +0200
Subject: Introduce HashStable trait and base ICH implementations on it.

This initial commit provides implementations for HIR, MIR, and
everything that also needs to be supported for those two.
---
 src/libsyntax/util/rc_slice.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/libsyntax/util')

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);
+    }
+}
-- 
cgit 1.4.1-3-g733a5