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-rw-r--r--src/libserialize/lib.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libserialize/lib.rs b/src/libserialize/lib.rs
index d1e7f6967bf..d51f070632f 100644
--- a/src/libserialize/lib.rs
+++ b/src/libserialize/lib.rs
@@ -24,8 +24,9 @@ Core encoding and decoding interfaces.
        html_root_url = "http://doc.rust-lang.org/nightly/",
        html_playground_url = "http://play.rust-lang.org/")]
 #![allow(unknown_features)]
-#![feature(slicing_syntax)]
 #![cfg_attr(stage0, allow(unused_attributes))]
+#![feature(old_impl_check)]
+#![feature(slicing_syntax)]
 
 // test harness access
 #[cfg(test)] extern crate test;