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-rw-r--r--src/libcore/iter-trait.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libcore/iter-trait.rs b/src/libcore/iter-trait.rs
index 09bfe2eff36..6de6633f5f8 100644
--- a/src/libcore/iter-trait.rs
+++ b/src/libcore/iter-trait.rs
@@ -2,7 +2,8 @@
 // workaround our lack of traits and lack of macros.  See core.{rc,rs} for
 // how this file is used.
 
-#[warn(deprecated_mode)];
+#[forbid(deprecated_mode)];
+#[forbid(deprecated_pattern)];
 
 use cmp::{Eq, Ord};
 use inst::{IMPL_T, EACH, SIZE_HINT};