big part of type_chack_visitor done

include/utils.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdlib>
 #include <vector>
 #include <unordered_map>
 
@@ -17,6 +18,18 @@ enum class AliasModifier { Alias = 0, Type = 1, Let = 2 };
 enum class AbstractTypeModifier { Basic = 0, Abstract = 1 };
 enum class FunctionTypeModifier { Function = 0, Operator = 1 };
 
+enum class ValueType { Const = 0, Var = 1, Tmp = 2 };
+
+inline ValueType IsConstModifierToValueType(IsConstModifier modifier) {
+  switch (modifier) {
+    case IsConstModifier::Const:
+      return ValueType::Const;
+    case IsConstModifier::Var:
+      return ValueType::Var;
+  }
+  // unreachable
+}
+
 template<typename T>
 class Storage {
 public: