Fix storage of non initialized variables

src/language/utils/SymbolTable.hpp

@@ -314,7 +314,7 @@ class SymbolTable
   }
 
   std::vector<Symbol>
-  getBuiltinFunctionSymbolList(const std::string& symbol, const TAO_PEGTL_NAMESPACE::position& use_position)
+  getBuiltinFunctionSymbolList(const std::string& symbol, const TAO_PEGTL_NAMESPACE::position& use_position) const
   {
     std::vector<Symbol> builtin_function_symbol_list;
 
@@ -338,7 +338,7 @@ class SymbolTable
   }
 
   bool
-  has(const std::string& symbol, const TAO_PEGTL_NAMESPACE::position& use_position)
+  has(const std::string& symbol, const TAO_PEGTL_NAMESPACE::position& use_position) const
   {
     for (auto i_stored_symbol : m_symbol_list) {
       // Symbol must be defined before the call

src/utils/checkpointing/Checkpoint.cpp

@@ -54,7 +54,8 @@ checkpoint()
         break;
       }
       default: {
-        if ((symbol.attributes().dataType() != ASTNodeDataType::builtin_function_t) and
+        if ((symbol_table.has(symbol.name(), ASTExecutionStack::getInstance().currentNode().begin())) and
+            (symbol.attributes().dataType() != ASTNodeDataType::builtin_function_t) and
             (not symbol.attributes().isModuleVariable())) {
           std::visit(
             [&](auto&& data) {