I have no idea what you are talking about. The fact that you can ignore the error, including doing so by accident, is the problem. Sum types solved this probl

I have no idea what you are talking about. The fact that you can ignore the error, including doing so by accident, is the problem. Sum types solved this problem a very long time ago, and there is simply no reason for a language created in the last decade not to have them. It is very simple conceptually, the function should not return a value and an error, because only one of those actually is valid. So it should return a value or an error.