Merge pull request #4606 from Manishearth/rustup

Fix some tests

Author: Manishearth

tests/ui/out_of_bounds_indexing/empty_array.rs

@@ -1,5 +1,5 @@
 #![warn(clippy::out_of_bounds_indexing)]
-#![allow(clippy::no_effect)]
+#![allow(clippy::no_effect, const_err)]
 
 fn main() {
     let x = [1, 2, 3, 4];

tests/ui/out_of_bounds_indexing/empty_array.stderr

@@ -1,5 +1,5 @@
 #![warn(clippy::out_of_bounds_indexing)]
-#![allow(clippy::no_effect, clippy::unnecessary_operation)]
+#![allow(clippy::no_effect, clippy::unnecessary_operation, const_err)]
 
 fn main() {
     let x = [1, 2, 3, 4];