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-rw-r--r--src/libstd/os.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstd/os.rs b/src/libstd/os.rs
index 5201a811791..6674dd532ae 100644
--- a/src/libstd/os.rs
+++ b/src/libstd/os.rs
@@ -26,6 +26,8 @@
  * to write OS-ignorant code by default.
  */
 
+#![experimental]
+
 #![allow(missing_doc)]
 #![allow(non_snake_case_functions)]