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-rw-r--r--src/libcore/fmt/num.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/fmt/num.rs b/src/libcore/fmt/num.rs
index 2992e7cf8db..c3843cae27a 100644
--- a/src/libcore/fmt/num.rs
+++ b/src/libcore/fmt/num.rs
@@ -65,7 +65,7 @@ trait GenericRadix {
         // characters for a base 2 number.
         let zero = T::zero();
         let is_nonnegative = x >= zero;
-        let mut buf = [0; 128];
+        let mut buf: [u8; 128] = unsafe { mem::uninitialized() };
         let mut curr = buf.len();
         let base = T::from_u8(self.base());
         if is_nonnegative {