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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 5ba77edee6e..40caee85541 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -100,7 +100,7 @@
 #![feature(optin_builtin_traits)]
 #![feature(prelude_import)]
 #![feature(repr_simd, platform_intrinsics)]
-#![feature(repr_transparent)]
+#![cfg_attr(stage0, feature(repr_transparent))]
 #![feature(rustc_attrs)]
 #![feature(rustc_const_unstable)]
 #![feature(simd_ffi)]