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-rw-r--r--src/libcore/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 8a514f1e78e..146d582eb7a 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -96,7 +96,7 @@
 #![feature(prelude_import)]
 #![feature(repr_simd, platform_intrinsics)]
 #![feature(rustc_attrs)]
-#![feature(rustc_const_unstable)]
+#![cfg_attr(bootstrap, feature(rustc_const_unstable))]
 #![feature(simd_ffi)]
 #![feature(specialization)]
 #![feature(staged_api)]