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-rw-r--r--src/libcore/task/spawn.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/task/spawn.rs b/src/libcore/task/spawn.rs
index 2033db0d58d..2db63d20f16 100644
--- a/src/libcore/task/spawn.rs
+++ b/src/libcore/task/spawn.rs
@@ -61,6 +61,7 @@
  ****************************************************************************/
 
 #[doc(hidden)]; // FIXME #3538
+#[warn(deprecated_mode)];
 
 use rt::rust_task;
 use rt::rust_closure;