From b075c000c2c52a674bb7c27a398dc3a795b40d8f Mon Sep 17 00:00:00 2001
From: aozhiwei <aozhiwei@kingsome.cn>
Date: Sat, 4 Mar 2023 10:07:01 +0800
Subject: [PATCH] 1

---
 a8/lisp.cc | 7 ++++++-
 a8/lisp.h  | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/a8/lisp.cc b/a8/lisp.cc
index ccdea56..1c06f57 100644
--- a/a8/lisp.cc
+++ b/a8/lisp.cc
@@ -158,6 +158,9 @@ namespace a8
                 if (token == "(") {
                     List new_list = std::make_shared<std::vector<std::shared_ptr<Value>>>();
                     stack.push_back(new_list);
+                    if (depth >= 0) {
+                        stack.at(depth)->push_back(std::make_shared<Value>(new_list));
+                    }
                     ++depth;
                 } else if (token == ")") {
                     --depth;
@@ -178,7 +181,9 @@ namespace a8
                             }
                             stack.at(depth)->push_back(symbol);
                         } else {
-                            abort();
+                            Symbol symbol;
+                            symbol.name = token;
+                            stack.at(depth)->push_back(std::make_shared<Value>(symbol));
                         }
                     }
                 }
diff --git a/a8/lisp.h b/a8/lisp.h
index 37c74c2..95ecef4 100644
--- a/a8/lisp.h
+++ b/a8/lisp.h
@@ -47,7 +47,7 @@ namespace a8
             a8::XObject ToXObject();
         };
 
-        class Scope
+        class Scope : public std::enable_shared_from_this<Scope>
         {
         public:
             std::shared_ptr<Value> Find(const std::string& name);