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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 021395d0c82..0493f92bc52 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -124,6 +124,7 @@
 #![feature(pointer_methods)]
 #![feature(inclusive_range_fields)]
 #![cfg_attr(stage0, feature(generic_param_attrs))]
+#![feature(rustc_const_unstable)]
 
 #![cfg_attr(not(test), feature(fn_traits, i128))]
 #![cfg_attr(test, feature(test))]