[racket] why do I get undefined , when using internal definition?

Thanks.

Also I missed was that when a unit is invoked/inferred , one
need not provide a another unit which implements import of
first unit, only names should be visible to first unit when it is
invoked.



On Sun, Jul 10, 2011 at 1:53 PM, Ryan Culpepper <ryan at cs.utah.edu> wrote:
> On 07/10/2011 01:04 AM, Veer wrote:
>>>
>>> Just between you and me, I never use internal "define".  I came from
>>> RnRS,
>>> where "define" was only used at top level, and top level is fraught with
>>> witchcraft.  "let", "let*", "let-values", and "let*-values" are more
>>> straightforward, overall, IMHO.
>>
>> I have no problem at all in using "let" and other.
>> I was just looking at the unit in guide , so I thought of defining a set
>> of
>> configuration as internal define for eg :
>>
>> (define configuration
>>   (lambda (conf1 conf2 ...)
>>     (unit
>>       (import)
>>       (export some-sig^)
>>       (define conf1 conf1)
>>       (define conf2 conf2)
>>       ....
>>       )))
>>
>> instead of
>>
>> (define configuration
>>   (lambda (s-conf1 s-conf2 ...)
>>     (unit
>>       (import)
>>       (export some-sig^)
>>       (define conf1 s-conf1)
>>       (define conf2 s-conf2)
>>       ....
>>       )))
>
> In that particular case, you can use 'unit-from-context' instead:
>
> (define configuration
>  (lambda (conf1 conf2 ...)
>    (unit-from-context some-sig^)))
>
> Ryan
>