diff --git a/src/rust.rs b/src/rust.rs
--- a/src/rust.rs
+++ b/src/rust.rs
@@ -1361,7 +1361,7 @@
         "        }}
     }}
     fn emit(&mut self) -> &mut {}Emitter {{
-        &self.emit
+        &mut self.emit
     }}",
         o.name
     )?;
@@ -1529,7 +1529,6 @@
         "#![allow(unused_imports)]
 #![allow(unused_variables)]
 #![allow(dead_code)]
-#![allow(unused_unit)]
 use {}{}::*;
 ",
         get_module_prefix(conf),