diff --git a/server/gameserver/app.cc b/server/gameserver/app.cc
index 32365e79..4684203e 100644
--- a/server/gameserver/app.cc
+++ b/server/gameserver/app.cc
@@ -10,6 +10,7 @@
 #include <a8/uuid.h>
 #include <a8/collision.h>
 #include <a8/magicenum.h>
+#include <a8/lisp.h>
 
 #include <f8/udplog.h>
 #include <f8/netmsghandler.h>
@@ -119,6 +120,12 @@ static void SavePerfLog()
 
 bool App::Init(int argc, char* argv[])
 {
+    {
+        auto env = std::make_shared<a8::lisp::GlobalScope>();
+        auto p = a8::lisp::Expr::Compile("(+ 1 3)", env);
+        auto ret = a8::lisp::Expr::Eval(p, env);
+        a8::XPrintf("p:%s ret:%f\n", {p->ToXObject().ToJsonStr(), ret->ToXObject().ToJsonStr()});
+    }
     signal(SIGPIPE, SIG_IGN);
     this->argc = argc;
     this->argv = argv;
diff --git a/third_party/a8 b/third_party/a8
index 592661ba..8cf0d04a 160000
--- a/third_party/a8
+++ b/third_party/a8
@@ -1 +1 @@
-Subproject commit 592661bae5547a0c1675816595b803f902d83041
+Subproject commit 8cf0d04a936a352fff2a502bf39d9c5729a15e12