This error I got with my crooked hands and invalid input

Although not sure if it needs to be addressed

This limit was put in there in order to detect infinite recursion. Since your code contains one, we can say that the safety measure worked correctly.

If you ever hit the limit while there is no infinite recursion, keep in mind that you can adjust the limit from the command line.

The above code prints lots of garbage to console prior to error message, when assembled. Maybe this could be tuned somehow to be avoided?

It's not exactly a garbage, it is a complete report of source context where the error happened, formatted consistently with the usual fasm's method of showing where and what line was assembled when the error was encountered. I could skip this and display only the error message like in the case of "out of memory" error, but here showing the line can be actually helpful, because it demonstrates where the infinite recursion happened and what macro/file got processed recursively.