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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 1fc205b5f75..99423349020 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -70,6 +70,7 @@
 #![feature(box_syntax)]
 #![feature(optin_builtin_traits)]
 #![feature(int_uint)]
+#![feature(unboxed_closures)]
 #![feature(core)]
 #![feature(hash)]
 #![feature(libc)]