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-rw-r--r--src/libstd/sync/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/sync/mod.rs b/src/libstd/sync/mod.rs
index fd6e46fd61d..e29faf18d83 100644
--- a/src/libstd/sync/mod.rs
+++ b/src/libstd/sync/mod.rs
@@ -163,6 +163,7 @@ pub use self::condvar::{Condvar, WaitTimeoutResult};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::mutex::{Mutex, MutexGuard};
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(bootstrap, allow(deprecated_in_future))]
 #[allow(deprecated)]
 pub use self::once::{Once, OnceState, ONCE_INIT};
 #[stable(feature = "rust1", since = "1.0.0")]