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-rw-r--r--src/libsyntax/ext/format.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index b04a800a32d..490246f8246 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -580,7 +580,7 @@ impl<'a, 'b> Context<'a, 'b> {
         let slicename = self.ecx.ident_of("__args_vec");
         {
             let args = names.into_iter().map(|a| a.unwrap());
-            let mut args = locals.into_iter().chain(args);
+            let args = locals.into_iter().chain(args);
             let args = self.ecx.expr_vec_slice(self.fmtsp, args.collect());
             lets.push(self.ecx.stmt_let(self.fmtsp, false, slicename, args));
         }