diff --git a/src/librustc_data_structures/array_vec.rs b/src/librustc_data_structures/array_vec.rs
index 9baaa44a370..c0b5b7f5173 100644
--- a/src/librustc_data_structures/array_vec.rs
+++ b/src/librustc_data_structures/array_vec.rs
@@ -19,6 +19,7 @@
 use std::fmt;
 use std::mem;
 use std::collections::range::RangeArgument;
+use std::collections::Bound::{Excluded, Included, Unbounded};
 
 pub unsafe trait Array {
     type Element;
diff --git a/src/librustc_data_structures/lib.rs b/src/librustc_data_structures/lib.rs
index 4623e52ffc2..b003cba292c 100644
--- a/src/librustc_data_structures/lib.rs
+++ b/src/librustc_data_structures/lib.rs
@@ -27,6 +27,7 @@
 
 #![feature(shared)]
 #![feature(collections_range)]
+#![feature(collections_bound)]
 #![feature(nonzero)]
 #![feature(rustc_private)]
 #![feature(staged_api)]