diff --git a/src/main.rs b/src/main.rs
index e369139a370fcd25ef65c360f4d928734fb098e5..b1df999b6734c274cb7a615ff595ac0218a88dcc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -54,6 +54,8 @@ fn main() {
         u2.enter(&s, "abc"); //
         u2.user2(&s, &mut u1); // try with key set
         u2.user2(&s, &mut u1); // try with key set
+        u2.expire(&s);
+        u2.user2(&s, &mut u1); // try with key set
     };
 }