diff --git a/demo-rs/src/main.rs b/demo-rs/src/main.rs
index 759bbe1..713a1d1 100644
--- a/demo-rs/src/main.rs
+++ b/demo-rs/src/main.rs
@@ -19,6 +19,7 @@
     extern "Rust" {
         type ThingR;
         fn print_r(r: &ThingR);
+        fn print(self: &ThingR);
     }
 }
 
@@ -28,6 +29,12 @@
     println!("called back with r={}", r.0);
 }
 
+impl ThingR {
+    fn print(&self) {
+        println!("method called back with r={}", self.0);
+    }
+}
+
 fn main() {
     let x = ffi::make_demo("demo of cxx::bridge");
     println!("this is a {}", x.as_ref().unwrap().get_name());