exec.rs.diff

diff --git a/src/exec.rs b/src/exec.rs
index 215d849..7ef8f67 100644
--- a/src/exec.rs
+++ b/src/exec.rs
@@ -4,6 +4,7 @@ use std::thread::sleep;
 
 use rand::Rng;
 use wasm_timer::Delay;
+use futures::poll;
 
 use super::console;
 use super::visualization;
@@ -214,7 +215,7 @@ pub fn run (
     if mode {
       console::log("wait");
       // sleep(Duration::new(1, 0)); // Runtime Error が起こる
-      Delay::new(Duration::from_millis(1000)); // 遅延してくれない
+      poll(Delay::new(Duration::from_millis(1000))); // 遅延してくれない
     }
   }