Oh, one more thing: make sure your language is set to "Determine
Language from source".
Almost all of the professional-level documentation in Racket assumes
that DrRacket has been set up use the #lang line. Make sure DrRacket
is in "Determine Language from source" mode.
If you neglect to set up DrRacket up to "Determine Language from
source", and try to use a #lang line anyway, then you will see strange
error messages. For example, if the language has been set to R5RS,
and we try to use a #lang line, we'll see something like the
following:
#%module-begin: illegal use (not a module body) in: (#%module-begin ...)
You reported a similar error message in your original message, so that
might be the real cause of the problems you ran into.
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