diff --git a/a8/lisp.cc b/a8/lisp.cc
index 1c06f57..88d9661 100644
--- a/a8/lisp.cc
+++ b/a8/lisp.cc
@@ -36,6 +36,13 @@ namespace a8
             value = cproc;
         }
 
+        void Value::Assign(List list)
+        {
+            type = ValueType::kList;
+            name = "";
+            value = list;
+        }
+
         a8::XObject Value::ToXObject()
         {
             switch (type) {
diff --git a/a8/lisp.h b/a8/lisp.h
index 95ecef4..67805d8 100644
--- a/a8/lisp.h
+++ b/a8/lisp.h
@@ -26,6 +26,9 @@ namespace a8
         struct Atom
         {
             double val = 0;
+
+            Atom() {};
+            Atom(double val) { this->val = val; }
         };
 
         struct Symbol
@@ -45,6 +48,8 @@ namespace a8
             Value(const std::string& proc_name, CProc cproc);
             bool IsType(ValueType t) { return t == type; };
             a8::XObject ToXObject();
+
+            void Assign(List list);
         };
 
         class Scope : public std::enable_shared_from_this<Scope>