Added support for trait aliases as object types.

src/libsyntax/parse/parser.rs

@@ -1532,7 +1532,7 @@ impl<'a> Parser<'a> {
                             if maybe_bounds && bounds.len() == 1 && !trailing_plus => {
                         let path = match bounds[0] {
                             GenericBound::Trait(ref pt, ..) => pt.trait_ref.path.clone(),
-                            _ => self.bug("unexpected lifetime bound"),
+                            GenericBound::Outlives(..) => self.bug("unexpected lifetime bound"),
                         };
                         self.parse_remaining_bounds(Vec::new(), path, lo, true)?
                     }