1 files changed, 3 insertions, 0 deletions
diff --git a/ast.h b/ast.h
index 3647a7b..b3e9d75 100644
--- a/ast.h
+++ b/ast.h
@@ -9,6 +9,7 @@ typedef enum {
 	AST_NUM,
 	AST_SYMBOL,
 } AstTy;
+#define AST_TY_LAST AST_SYMBOL+1
 
 struct _astnode;
 typedef struct _astnode AstNode;
@@ -39,6 +40,8 @@ AstNode astnode_new_symbol(char *s);
 
 void astnode_disp(AstNode *a);
 
+const char *ast_ty_to_str(AstTy ty);
+
 
 
 #endif