[racket] enter! not working?

Ok --- I'll work on the Guide to try to make it clearer.

Thanks,
Matthew

At Mon, 28 Jun 2010 13:26:33 +1000, Brad Long wrote:
> Thankyou. My bad. Me newbie - guess you can tell!
> 
> Quoting Matthew Flatt <mflatt at cs.utah.edu>:
> 
> > Are you working with the `racket' command-line program or within
> > DrRacket?
> >
> > Within DrRacket, you don't need `enter!'.
> >
> > At Sun, 27 Jun 2010 22:06:52 +1000, "Brad Long" wrote:
> >> I am using DrRacket Version 5 on Windows. When I follow the example (see
> >> below) and get to the part where I am suppposed to use "enter!", I get this
> >> error:
> >>
> >> reference to an identifier before its definition: enter!
> >>
> >> Thanks for any help.
> >>
> >> Brad.
> >>
> >> ===> START
> >>
> >> #lang racket
> >>
> >>   (define (extract str)
> >>     (substring str 4 7))
> >>
> >> If calling (extract "the boy") is part of the main action of your program,
> >> that would go in the definitions area, too. But if it was just an example
> >> expression that you were using to explore extract, then you'd more likely
> >> leave the definitions area as above, click Run, and then evaluate (extract
> >> "the boy") in the REPL.
> >>
> >> With racket, you'd save the above text in a file using your favorite editor.
> >> If you save it as "extract.rkt", then after starting racket in the same
> >> directory, you'd evaluate the following sequence:
> >>
> >>   > (enter! "extract.rkt")
> >>   > (extract "the gal out of the city")
> >>
> >>   "gal"
> >>
> >> The enter! form both loads the code and switches the evaluation context to
> >> the inside of the module, just like DrRacket's Run button.
> >>
> >> =====> END
> >>
> >>
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