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-rw-r--r--src/libstd/rt/mod.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libstd/rt/mod.rs b/src/libstd/rt/mod.rs
index 19853138afd..4490977bde6 100644
--- a/src/libstd/rt/mod.rs
+++ b/src/libstd/rt/mod.rs
@@ -51,6 +51,8 @@ Several modules in `core` are clients of `rt`:
 
 */
 
+#![experimental]
+
 // FIXME: this should not be here.
 #![allow(missing_doc)]