[plt-scheme] Side effect requiring rnrs/base-6?

Hi Jens,

Thanks for the explanation. But the same code is behaving differently  
in linux and mac. Refer the screenshots below. I suspect something  
fishy here.
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And why does it work when I comment the letrec block?

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Cheers,
GG

On 16-Sep-2009, at 11:29 PM, Jens Axel S?gaard wrote:

> 2009/9/16 Jens Axel S?gaard <jensaxel at soegaard.net>:
>> [sent privately too by accident]
>>
>> 2009/9/16 Ganesh Gunasegaran <ganesh.gunas at gmail.com>:
>>> Hi All,
>>>
>>> I am very new to Scheme
>>>
>>> What is wrong with the following code?
>>>
>>> --------------------------------------------------------------------------------------------------------------------------------
>>> #lang scheme
>>> (require rnrs/base-6)
>
> One more thing:
>
> Since the entire rnrs/base-6 is required some functions from "scheme"
> such as car, cdr, cons are shadowed by their bindings in rnrs/base-6.
> In particular in rnrs the identifier car is bound to the same value
> as the identifier mcar is bound to in "scheme'. That is, after the
> require line, when you write "car" you are actually calling "mcar".
>
> This might we somewhat confusing, for new Scheme users, so
> here is a practical advise:
>
> Stick either to the "scheme" language, and if you need a particular
> function from rnrs use the documentation to figure out, what
> is called in PLT Scheme (in 99% of the cases the names
> are the same).
>
> -- 
> Jens Axel S?gaard