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-rw-r--r--src/libcore/mutable.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/mutable.rs b/src/libcore/mutable.rs
index 5948c630cd8..b314ad61ee2 100644
--- a/src/libcore/mutable.rs
+++ b/src/libcore/mutable.rs
@@ -8,7 +8,7 @@ dynamic checks: your program will fail if you attempt to perform
 mutation when the data structure should be immutable.
 
 */
-// tjc: re-forbid deprecated modes after snapshot
+#[forbid(deprecated_mode)];
 #[forbid(deprecated_pattern)];
 
 use util::with;