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-rw-r--r--src/libcollections/lib.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libcollections/lib.rs b/src/libcollections/lib.rs
index a64fffab45c..10650dab583 100644
--- a/src/libcollections/lib.rs
+++ b/src/libcollections/lib.rs
@@ -133,10 +133,13 @@ mod std {
 #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
 pub enum Bound<T> {
     /// An inclusive bound.
+    #[stable(feature = "collections_bound", since = "1.17.0")]
     Included(T),
     /// An exclusive bound.
+    #[stable(feature = "collections_bound", since = "1.17.0")]
     Excluded(T),
     /// An infinite endpoint. Indicates that there is no bound in this direction.
+    #[stable(feature = "collections_bound", since = "1.17.0")]
     Unbounded,
 }