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-rw-r--r--src/libstd/std.rc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/std.rc b/src/libstd/std.rc
index 7622f1b8de6..cc076772e6e 100644
--- a/src/libstd/std.rc
+++ b/src/libstd/std.rc
@@ -20,6 +20,7 @@ not required in or otherwise suitable for the core library.
 
 #[allow(vecs_implicitly_copyable)];
 #[deny(non_camel_case_types)];
+#[warn(deprecated_mode)];
 #[forbid(deprecated_pattern)];
 
 extern mod core(vers = "0.4");