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-rw-r--r--src/libstd/sync/semaphore.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstd/sync/semaphore.rs b/src/libstd/sync/semaphore.rs
index 891f8775ff2..8f08c840c21 100644
--- a/src/libstd/sync/semaphore.rs
+++ b/src/libstd/sync/semaphore.rs
@@ -12,6 +12,10 @@
             reason = "the interaction between semaphores and the acquisition/release \
                       of resources is currently unclear",
             issue = "27798")]
+#![rustc_deprecated(since = "1.7.0",
+                    reason = "easily confused with system sempahores and not \
+                              used enough to pull its weight")]
+#![allow(deprecated)]
 
 use ops::Drop;
 use sync::{Mutex, Condvar};