1 files changed, 11 insertions, 2 deletions

diff --git a/ast.h b/ast.h
index 3b59d2b..7b2a35e 100644
--- a/ast.h
+++ b/ast.h
@@ -3,11 +3,20 @@
 
 #include <stdlib.h>
 
-#define PROGRAM_NODE 0
+enum NODE_TYPE {
+  PROGRAM_NODE,
+  TYPE_NODE,
+  ARGUMENT_NODE
+};
+
+typedef struct ast_node_data {
+  void* value;
+  void* type;
+} ast_node_data;
 
 typedef struct ast_node {
   int type;
-  void* value;
+  ast_node_data* data;
   struct ast_node* left;
   struct ast_node* right;
 } ast_node;