Thank you, @philip.mcgrath. It’s probably due to my inexperience in this area, but I can’t see from that example or documentation how I would set thing up so that instead of typing #lang s-exp "my-lang.rkt" I could just do #lang my-lang. I do understand that I need to run raco pkg install in a directory to set things up.

I’m suspecting that I need to create a reader that’s a shell around the s-exp reader which then refers to the expander. But that’s just a guess. I’ll continue combing the docs.

Thank you, @mbutterick! I thought a wrapper might be necessary. I’ll take a look at those links. And thanks again, @philip.mcgrath.