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-rw-r--r--src/libserialize/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libserialize/lib.rs b/src/libserialize/lib.rs
index 910600d91e4..ee5e40adc9c 100644
--- a/src/libserialize/lib.rs
+++ b/src/libserialize/lib.rs
@@ -25,6 +25,7 @@ Core encoding and decoding interfaces.
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(allow(unused_variables), deny(warnings))))]
+#![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(box_syntax)]
 #![feature(collections)]