Add a filter to data that cannot be printed

src/language/node_processor/OStreamProcessor.hpp

@@ -33,7 +33,13 @@ class OStreamProcessor final : public INodeProcessor
 
   OStreamProcessor(ASTNode& node, std::ostream& os) : m_node{node}, m_os(os)
   {
-    ;
+    for (auto& child : m_node.children) {
+      if ((child->m_data_type == ASTNodeDataType::type_id_t) or (child->m_data_type == ASTNodeDataType::function_t) or
+          (child->m_data_type == ASTNodeDataType::c_function_t)) {
+        throw parse_error("invalid argument, cannot print a '" + dataTypeName(child->m_data_type) + "'",
+                          std::vector{child->begin()});
+      }
+    }
   }
 };