---

yaml
---
r: 176959
b: refs/heads/snap-stage3
c: 25a2797
h: refs/heads/master
i:
  176957: f8dfb4f
  176955: cd8e6fb
  176951: 5601047
  176943: 7059fc4
  176927: 26d6c4c
  176895: 07e07c0
v: v3

Author: nikomatsakis

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: a530cc9706324ad44dba464d541a807eb5afdb08
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 7d68250eb49e455ce84e762f2324510da288be45
+refs/heads/snap-stage3: 25a27977fa1cbaddd4c2275881bee358eeaeb8a1
 refs/heads/try: fde4472848b662a4d1236388c4cf15e2450237e6
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d

branches/snap-stage3/src/librustc/middle/ty_fold.rs

@@ -71,7 +71,7 @@ pub trait TypeFolder<'tcx> : Sized {
     fn exit_region_binder(&mut self) { }
 
     fn fold_binder<T>(&mut self, t: &ty::Binder<T>) -> ty::Binder<T>
-        where T : TypeFoldable<'tcx> + Repr<'tcx>
+        where T : TypeFoldable<'tcx> + Repr<'tcx> + Clone
     {
         // FIXME(#20526) this should replace `enter_region_binder`/`exit_region_binder`.
         super_fold_binder(self, t)
@@ -186,7 +186,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
     }
 }
 
-impl<'tcx, T:TypeFoldable<'tcx>+Repr<'tcx>> TypeFoldable<'tcx> for ty::Binder<T> {
+impl<'tcx, T:TypeFoldable<'tcx>+Repr<'tcx>+Clone> TypeFoldable<'tcx> for ty::Binder<T> {
     fn fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> ty::Binder<T> {
         folder.fold_binder(self)
     }