I may not finish the rest of Simply Scheme.
Chapter 22 deals with files and I/O, and some of the exercises and examples are not working. Simply Scheme came out just after R5RS, but I cannot find anything about a specific version. It might even be running R4RS.
I guess the I/O functions work differently in different implementations. Or perhaps Racket is handling things differently. My goal of completing 100% of Simply Scheme will not happen.
I do not know what I will do next. The options are: The Little Schemer books, How To Design Programs, climb Mount SICP, or get back to Clojure.