I think you're right to be a little wary of this situation. Few things are as tiresome from an answerer's point of view as a person asking a question, getting and accepting an answer that they say has solved the problem, then re-posting the same question. If you're making a new question with the exact same code, it's likely that some of the same people will see both, and recognize the code. It's possible that they will not realize, unless you make it quite clear, that you have a new problem with the same code.
How do you make it clear? Somewhere near the beginning of your new question (though preferably after the first three or so lines so that the preview on the Questions list page still contains information specific to your new difficulty) make reference, and link to, the previous question. You don't need to go into the details; just mention that you had an earlier question about the same code that seems completely unrelated to the new problem.
For the best results and bonus points, you should address the older question in a way that does not assume that every reader of your new question saw that one. I.e., don't make your title "New prblem with my flang code, guys"; neither say things like "Thanks for the help with the old problem, need your eyes again."
Just explain, clearly but succintly, why this new question represents a distinct problem ("Solved an earlier syntax problem here, but I can't find any connection to this exception I'm seeing now.") and you should have no trouble. If your question is incorrectly closed as a duplicate, raise a custom mod flag or an appeal here on Meta.
(You should also be aware that if you ask many questions featuring the same code, you're likely to get remarks at some point about "writing your application for you" or "SO is not a debugging service". Perhaps more than at other times, when repeatedly seeking help for the same task, you will need to demonstrate that you're truly stuck.)