Remove two uses of old [] notation

src/librustc_typeck/coherence/overlap.rs

@@ -147,7 +147,7 @@ fn visit_item(&mut self, item: &'v ast::Item) {
                             None => {
                                 self.tcx.sess.bug(
                                           &format!("no default implementation recorded for `{:?}`",
-                                          item)[]);
+                                          item));
                             }
                         }
                     }

src/librustc_typeck/collect.rs

@@ -1720,7 +1720,7 @@ fn ty_generic_predicates<'a,'tcx>(ccx: &CrateCtxt<'a,'tcx>,
         let param_ty = ty::ParamTy::new(space, index, param.ident.name).to_ty(ccx.tcx);
         let bounds = compute_bounds(&ccx.icx(&(base_predicates, ast_generics)),
                                     param_ty,
-                                    &param.bounds[],
+                                    &param.bounds,
                                     SizedByDefault::Yes,
                                     param.span);
         let predicates = ty::predicates(ccx.tcx, param_ty, &bounds);