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-rw-r--r--src/liballoc/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 0293d5402c4..c2dad9a1ae4 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -90,6 +90,7 @@
 #![feature(unique)]
 #![feature(unsafe_no_drop_flag, filling_drop)]
 #![feature(unsize)]
+#![feature(extended_compare_and_swap)]
 
 #![cfg_attr(not(test), feature(raw, fn_traits, placement_new_protocol))]
 #![cfg_attr(test, feature(test, box_heap))]