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-rw-r--r--src/libstd/collections/mod.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstd/collections/mod.rs b/src/libstd/collections/mod.rs
index 9e5288f9541..ccef1c0fd2a 100644
--- a/src/libstd/collections/mod.rs
+++ b/src/libstd/collections/mod.rs
@@ -12,6 +12,8 @@
  * Collection types.
  */
 
+#![experimental]
+
 pub use core_collections::{Collection, Mutable, Map, MutableMap};
 pub use core_collections::{Set, MutableSet, Deque};
 pub use core_collections::{Bitv, BitvSet, BTree, DList, EnumSet};