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-rw-r--r--src/libtest/stats.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libtest/stats.rs b/src/libtest/stats.rs
index 7e7f36f6e83..9f9a24d2426 100644
--- a/src/libtest/stats.rs
+++ b/src/libtest/stats.rs
@@ -169,7 +169,8 @@ impl<T: FloatMath + FromPrimitive> Stats<T> for [T] {
     fn sum(&self) -> T {
         let mut partials = vec![];
 
-        for &mut x in self.iter() {
+        for &x in self.iter() {
+            let mut x = x;
             let mut j = 0;
             // This inner loop applies `hi`/`lo` summation to each
             // partial so that the list of partial sums remains exact.