diff --git a/src/test1.cpp b/src/test1.cpp
index da76d50..67fcb13 100644
--- a/src/test1.cpp
+++ b/src/test1.cpp
@@ -1,6 +1,7 @@
 #include <coroutine>
 #include <iostream>
 #include <stdexcept>
+#include <string>
 #include <type_traits>
 
 template<class T>
@@ -11,8 +12,20 @@ struct coroutine: std::coroutine_handle<Promise<T>>{
     using promise_type = ::Promise<T>;
 };
 
+struct RAII{
+    std::string name;
+    RAII(const std::string &s):name(s){
+        std::cout<<__FUNCTION__<<" "<<s<<'\n';
+    }
+    ~RAII(){
+        std::cout<<__FUNCTION__<<" "<<name<<'\n';
+    }
+};
+
 template<class T=void>
 struct Promise{
+    Promise():raii("in promise"){};
+    RAII raii;
     auto initial_suspend(){
         std::cout<<__FUNCTION__<<'\n';
         return std::suspend_always{};
@@ -37,11 +50,13 @@ struct Promise{
         std::cout<<__FUNCTION__<<' '<<t<<'\n';
         return std::suspend_always{};
     }
-    
     coroutine<T> h;
 };
 
+
+
 coroutine<int> test(){
+    RAII raii("in test");
     std::cout<<"testing\n";
     co_yield 1;
     co_yield 2;
@@ -56,4 +71,5 @@ int main(){
         handle.resume();
         std::cout<<__FUNCTION__<<'\n';
     }
+    handle.destroy();//如果不destroy()那么~RAII in promise将不会显示，也不能将destroy()交给~Promise()管理，也不会~RAII in promise
 }
\ No newline at end of file