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-rw-r--r--src/libstd/treemap.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/treemap.rs b/src/libstd/treemap.rs
index c8ab48e65c0..06ac1a71bac 100644
--- a/src/libstd/treemap.rs
+++ b/src/libstd/treemap.rs
@@ -848,7 +848,7 @@ mod test_treemap {
         check_equal(ctrl, &map);
         assert!(map.find(&5).is_none());
 
-        let rng = rand::IsaacRng::new_seeded(&[42]);
+        let mut rng = rand::IsaacRng::new_seeded(&[42]);
 
         for 3.times {
             for 90.times {