fix: corrected an error that could lead to interpreter crash under certain conditions

Author: jacopodl

argon/vm/datatype/function.cpp

@@ -154,6 +154,9 @@ Function *FunctionClone(const Function *func) {
     if (fn != nullptr) {
         fn->native = func->native;
 
+        if (!func->IsNative())
+            IncRef(fn->code);
+
         fn->name = IncRef(func->name);
         fn->qname = IncRef(func->qname);
         fn->doc = IncRef(func->doc);