Rollup merge of #41141 - michaelwoerister:direct-metadata-ich-final, r=nikomatsakis

[rust.git] / src / librustc / ty / mod.rs

diff --git a/src/librustc/ty/mod.rs b/src/librustc/ty/mod.rs
index a2c356c20db09d563afa0e532dc964c39f139138..23f35d3bdd7929e262e1a56313ed7edf88dfe48d 100644 (file)
--- a/src/librustc/ty/mod.rs
+++ b/src/librustc/ty/mod.rs
@@ -452,6 +452,23 @@ fn hash<H: Hasher>(&self, s: &mut H) {
     }
 }
 
+impl<'a, 'tcx> HashStable<StableHashingContext<'a, 'tcx>> for ty::TyS<'tcx> {
+    fn hash_stable<W: StableHasherResult>(&self,
+                                          hcx: &mut StableHashingContext<'a, 'tcx>,
+                                          hasher: &mut StableHasher<W>) {
+        let ty::TyS {
+            ref sty,
+
+            // The other fields just provide fast access to information that is
+            // also contained in `sty`, so no need to hash them.
+            flags: _,
+            region_depth: _,
+        } = *self;
+
+        sty.hash_stable(hcx, hasher);
+    }
+}
+
 pub type Ty<'tcx> = &'tcx TyS<'tcx>;
 
 impl<'tcx> serialize::UseSpecializedEncodable for Ty<'tcx> {}