---

yaml
---
r: 273140
b: refs/heads/beta
c: 957ee5c
h: refs/heads/master

Author: aturon

[refs]

@@ -23,7 +23,7 @@ refs/tags/0.9: 36870b185fc5f5486636d4515f0e22677493f225
 refs/tags/0.10: ac33f2b15782272ae348dbd7b14b8257b2148b5a
 refs/tags/0.11.0: e1247cb1d0d681be034adb4b558b5a0c0d5720f9
 refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
-refs/heads/beta: 1f34086e947139d498847dce49ba437748f17c2d
+refs/heads/beta: 957ee5ce347999ef2c1acfdb63a76643c61f6516
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: e06d2ad9fcd5027bcaac5b08fc9aa39a49d0ecd3
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f

branches/beta/src/librustc/middle/subst.rs

@@ -160,6 +160,15 @@ impl<'tcx> Substs<'tcx> {
         Substs { types: types, regions: regions }
     }
 
+    pub fn with_method_from_subst(self, other: &Substs<'tcx>) -> Substs<'tcx> {
+        let Substs { types, regions } = self;
+        let types = types.with_vec(FnSpace, other.types.get_slice(FnSpace).to_vec());
+        let regions = regions.map(|r| {
+            r.with_vec(FnSpace, other.regions().get_slice(FnSpace).to_vec())
+        });
+        Substs { types: types, regions: regions }
+    }
+
     /// Creates a trait-ref out of this substs, ignoring the FnSpace substs
     pub fn to_trait_ref(&self, tcx: &TyCtxt<'tcx>, trait_id: DefId)
                         -> ty::TraitRef<'tcx> {