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-rw-r--r--src/libcore/fmt/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 69df413a88c..1d3767c9e33 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -11,6 +11,7 @@
 //! Utilities for formatting and printing strings
 
 #![allow(unused_variables)]
+#![stable]
 
 use any;
 use cell::{Cell, RefCell, Ref, RefMut};