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-rw-r--r--library/std/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 5224672adb2..30e7a7f3c3b 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -319,7 +319,7 @@
 #![feature(unsafe_block_in_unsafe_fn)]
 #![feature(unsafe_cell_get_mut)]
 #![feature(unsafe_cell_raw_get)]
-#![feature(untagged_unions)]
+#![cfg_attr(bootstrap, feature(untagged_unions))]
 #![feature(unwind_attributes)]
 #![feature(vec_into_raw_parts)]
 #![feature(wake_trait)]