thanks for the reply!
I'm sorry I didn't specify the version and OS of the racket, it works very
well, thank you.
在 2020年6月20日星期六 UTC+8下午7:43:46，Matthew Flatt写道：
> At Fri, 19 Jun 2020 20:25:47 -0700 (PDT), Yuki Lee wrote:
> > https://www2.ccs.neu.edu/racket/pubs/icfp99-ffkf.pdf
> > I have read this paper.
> > I encountered a problem when I tried to run the code at the end.
> Unfortunately, that code that pre-dates the current Racket module
> system, so it did not keep running for very long.
> Enclosed is a somewhat modernized version of the code that should run
> in recent (last 15-20 years?) Racket.
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