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-rw-r--r--src/libcore/str/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 8fdd66f83ce..f93a5114dcf 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -230,7 +230,7 @@ impl<F> CharEq for F where F: FnMut(char) -> bool {
 impl<'a> CharEq for &'a [char] {
     #[inline]
     fn matches(&mut self, c: char) -> bool {
-        self.iter().any(|&mut m| m.matches(c))
+        self.iter().any(|&m| { let mut m = m; m.matches(c) })
     }
 
     #[inline]