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-rw-r--r--src/libstd/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 1dbb0c6ec83..8198ae73a31 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -293,7 +293,7 @@
 #![feature(raw)]
 #![feature(renamed_spin_loop)]
 #![feature(rustc_attrs)]
-#![feature(rustc_const_unstable)]
+#![cfg_attr(bootstrap, feature(rustc_const_unstable))]
 #![feature(rustc_private)]
 #![feature(shrink_to)]
 #![feature(slice_concat_ext)]