Clean up printing of Receiver to tokens
diff --git a/syntax/mod.rs b/syntax/mod.rs
index 49bb299..b160e5a 100644
--- a/syntax/mod.rs
+++ b/syntax/mod.rs
@@ -75,6 +75,7 @@
 }
 
 pub struct Receiver {
+    pub ampersand: Token![&],
     pub mutability: Option<Token![mut]>,
     pub ident: Ident,
 }