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-rw-r--r--src/libcore/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 2e1f925c49a..59a296c2a76 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -91,6 +91,7 @@
 #![feature(untagged_unions)]
 #![feature(unwind_attributes)]
 #![feature(doc_spotlight)]
+#![feature(rustc_const_unstable)]
 
 #[prelude_import]
 #[allow(unused)]