[racket] `'unquote -- error or not?

you have one too many ' if that's what you want 


On Jul 7, 2011, at 10:33 AM, Bas Steunebrink wrote:

> Thanks for the fast answers!
> Actually I wanted to get 'unquote inside of a quasiquote; I'm now using:
> `(... ,''unquote ...)
> It ain't pretty but it appears to do the job! :-)
> 
> Bas
> 
> 
> On 7/7/11 16:20 PM, Robby Findler wrote:
>> FWIW, I'm right in line with this rationale.
>> 
>> Robby
>> 
>> On Thu, Jul 7, 2011 at 9:13 AM, Matthias Felleisen<matthias at ccs.neu.edu>  wrote:
>>> 
>>> On Jul 7, 2011, at 10:01 AM, Bas Steunebrink wrote:
>>> 
>>>> Ciao a tutti,
>>>> 
>>>> When I type `'unquote in DrRacket, an error is thrown:
>>>> 
>>>>> `'unquote
>>>> (X) unquote: expects exactly one expression in: (unquote)
>>>> 
>>>> I understand why this error occurs from the way quasiquote is expanded; see e.g. http://community.schemewiki.org/?scheme-faq-language#qqmacro (I guess DrRacket works similarly). Still, I feel the result should be just 'unquote. What do you think?
>>> 
>>> No, your use of backquote explicitly calls for a search for unquote.
>>> 
>>> If you want the symbol unquote inside of an unquote, you first need to unquote:
>>> 
>>>> `,'unquote
>>> unquote
>>> 
>>> (as in comma = unquote).
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