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-rw-r--r--src/libstd/sync/task_pool.rs5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libstd/sync/task_pool.rs b/src/libstd/sync/task_pool.rs
index c34fa66d12a..088827dc084 100644
--- a/src/libstd/sync/task_pool.rs
+++ b/src/libstd/sync/task_pool.rs
@@ -10,6 +10,11 @@
 
 //! Abstraction of a thread pool for basic parallelism.
 
+#![unstable = "the semantics of a failing task and whether a thread is \
+               re-attached to a thread pool are somewhat unclear, and the \
+               utility of this type in `std::sync` is questionable with \
+               respect to the jobs of other primitives"]
+
 use core::prelude::*;
 
 use sync::{Arc, Mutex};