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-rw-r--r--src/libcore/lib.rs6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 5c681b3a5d8..8221df56a51 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -120,9 +120,9 @@
 #![feature(rtm_target_feature)]
 #![feature(f16c_target_feature)]
 #![feature(hexagon_target_feature)]
-#![feature(const_slice_len)]
-#![feature(const_str_as_bytes)]
-#![feature(const_str_len)]
+#![cfg_attr(bootstrap, feature(const_slice_len))]
+#![cfg_attr(bootstrap, feature(const_str_as_bytes))]
+#![cfg_attr(bootstrap, feature(const_str_len))]
 #![feature(const_int_conversion)]
 #![feature(const_transmute)]
 #![feature(non_exhaustive)]