ast updated

include/ast/Node.h

@@ -1,10 +1,14 @@
 #pragma once
 
+#include <iostream>
 #include <memory>
 #include <vector>
 #include "NodeKind.h"
+#include "utils/getIndent.hpp"
 
 struct Node {
     virtual ~Node() = default;
+
     virtual NodeKind getKind() const = 0;
+    virtual void repr(std::ostream& os, int indent = 0) const = 0;
 };