[Rd] Bug with ..0

[Gabor Grothendieck]

Note that ?Reserved lists ..1, ..2, to ..9 but does not list ..0.

Also, why is it reserved?  What is the future intended use?

On Sun, May 30, 2010 at 3:40 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
> On 30/05/2010 3:13 PM, Gabor Grothendieck wrote:
>>
>> This function call returns 3 but should return 32.  ..0 has no special
>> significance in R as far I know yet it seems to be acting as if it
>> were ..1 .  Comments?
>>
>
> Actually, ..0 is a reserved symbol.  (This is just barely documented in the
> R Language Defn, with more detail in R Internals.)  It stands for the
> "zeroth element of ..."  That definition makes no sense (indexing of ...
> starts at 1), so we should probably generate an error when you use it, and
> perhaps when you try to redefine it by using it as an argument.  But this is
> really a case of you doing something you shouldn't, and the error handling
> not slapping you on the wrist.
>
> Duncan Murdoch
>>
>>
>>>
>>> ff <- function(..0, ...) ..0
>>> ff(32, 3)
>>>
>>
>> [1] 3
>>
>>
>>>
>>> R.version.string
>>>
>>
>> [1] "R version 2.11.0 Patched (2010-04-26 r51822)"
>>
>>>
>>> win.version()
>>>
>>
>> [1] "Windows Vista (build 6002) Service Pack 2"
>>
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>
>