1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index 1cbc2b98c93..8d0d399fa31 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -210,7 +210,7 @@ pub struct MacItems {
 }
 
 impl MacItems {
-    pub fn new<I: Iterator<P<ast::Item>>>(mut it: I) -> Box<MacResult+'static> {
+    pub fn new<I: Iterator<P<ast::Item>>>(it: I) -> Box<MacResult+'static> {
         box MacItems { items: it.collect() } as Box<MacResult+'static>
     }
 }