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-rw-r--r--src/libstd/sync/once.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index d9edf5d1254..bb18fe95a9d 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -267,7 +267,7 @@ impl Once {
     #[cold]
     fn call_inner(&'static self,
                   ignore_poisoning: bool,
-                  mut init: &mut FnMut(bool)) {
+                  init: &mut FnMut(bool)) {
         let mut state = self.state.load(Ordering::SeqCst);
 
         'outer: loop {