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-rw-r--r--src/libcore/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index a7e3b61b0d4..95b3e59c2c3 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -49,6 +49,7 @@
 
 #![crate_name = "core"]
 #![experimental]
+#![staged_api]
 #![crate_type = "rlib"]
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",