[plt-scheme] Re: DrScheme: Reference to undefined identifier: require

Hey Daniel!

Looking good. My only other comment would be that you're probably
going to want to use the 'scheme' module rather than the 'mzscheme'
module. 'mzscheme' is a legacy module language for previous versions
of PLT Scheme. If you want the latest and greatest, then 'scheme' is
the way to go, e.x.:

    (module xxx mzscheme
      ...)

becomes

    (module xxx scheme
      ...)

Aside from that, any detailed advice would be contingent upon knowing
more about your background and your goals in learning Scheme, but
here's the PLT Scheme Guide which may be useful:
http://docs.plt-scheme.org/guide/index.html

Good luck, and have fun!
Zane

On Tue, Aug 4, 2009 at 4:48 PM, Daniel<phelps.da at gmail.com> wrote:
> Zane:
>  Your answer was right on, and I was able to figure out the details.
> Life seems a bit easier when using module, require and provide.  I
> picked R5RS when I began, because DrScheme says it's "no frills", and
> I'm a no frills kind of guy.  Following your recommendation broke a
> couple things, but nothing that could not be fixed in 5 minutes.
>
> This is how things ended up:
>
> In ch-2.scm:
> (module ch-2 mzscheme
>  ; - A collection of super-clever solutions to problems in my
> textbook
> (provide $FUNCTION_NAMES))
>
> In ch-2-tests.scm:
> (module ch-2-tests mzscheme
>  (require "ch-2.scm")
>  (require "dp-test-framework.scm")
>  ;  - The test suite for my impressive solutions.
> )
>
> In dp-test-framework.scm:
> (module dp-test-framework mzscheme
>  ;a pretty cute way to run tests and aggregate the results
> (provide $A_COUPLE_FUNCTIONS))
>
>
> Based on what you see above, do I understand module, require and
> provide?  Is this a good way to work with Scheme?  Do you have any
> pointers for a newbie?  I look forward to hearing your response.
> Thanks for your help so far.
>
> Sincerely,
> Daniel
>
> On Aug 3, 7:58 pm, Zane Shelby <zaneshe... at gmail.com> wrote:
>> Hey Daniel!
>>
>> The problem is 'require' isn't part of the R5RS language, so when you
>> try to use it in that language you're going to get an error. You could
>> use load, but that has slightly different behavior.
>>
>> Is there particular reason why you'd like to use r5rs? If not, I'd
>> recommend you use PLT Scheme by selecting 'module' from the pulldown
>> and putting '#lang scheme' at the top of your file.
>>
>> Hope that helps,
>> Zane
>>
>>
>>
>> On Mon, Aug 3, 2009 at 12:09 PM, Daniel<phelps... at gmail.com> wrote:
>> > Hello Everybody:
>> >    I am new to Scheme, so please be patient with me.  I have 2 files:
>> > ch2.scm and schemeTests.scm.  I would like to include schemeTests.scm
>> > in the ch2.scm file.
>>
>> > According to the documentation, the include procedure "inlines the
>> > syntax in the file designated by path-spec in place of the include
>> > expression."  http://docs.plt-scheme.org/reference/include.html This
>> > behavior is what I need.  However, I am having some trouble.
>> > Hopefully, this short interactive session can tell you something.
>>
>> > Welcome to DrScheme, version 4.2.1 [3m].
>> > Language: R5RS; memory limit: 128 megabytes.
>> >> (require scheme/include)
>> > . . reference to undefined identifier: require
>> >> (include "schemeTests.scm")
>> > . . reference to undefined identifier: include
>> >> #lang scheme
>> > . . reference to undefined identifier: module
>>
>> > If I place a call to (require scheme/include) in my source file, I
>> > receive the same error.  However, if I change the language from R5RS
>> > to advanced student custom, I get no complaints about 'require', but
>> > it breaks some of my previously existing code.  What am I doing
>> > wrong?  Your help and consideration is appreciated.
>>
>> > Sincerely,
>> > Daniel
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