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-rw-r--r--src/libcore/f64.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libcore/f64.rs b/src/libcore/f64.rs
index 4f4fe391625..5b2d7daaa15 100644
--- a/src/libcore/f64.rs
+++ b/src/libcore/f64.rs
@@ -1,3 +1,7 @@
+// NB: transitionary, de-mode-ing.
+#[forbid(deprecated_mode)];
+#[forbid(deprecated_pattern)];
+
 //! Operations and constants for `f64`
 
 // PORT