R devel - Sep 2006 - Warning: a final empty element has been omitted

How can I suppress this warning?
> options(warn = -10)
> list(1,2,3,)
Warning: a final empty element has been omitted
the part of the args list of 'list' being evaluated was:
   (1, 2, 3, )
[[1]]
[1] 1

[[2]]
[1] 2

[[3]]
[1] 3
> suppressWarnings(list(1,))
Warning: a final empty element has been omitted
the part of the args list of 'list' being evaluated was:
   (1, )
[[1]]
[1] 1


And can anyone add some insight as to why this warning was added?  It
was nice to be able to use a construction like:

a <- list(
 b = 3,
 c = 4,
)

so when you added a new line, you could just copy and paste an existing line.

Hadley

Sorry I should have mentioned:

platform       i386-apple-darwin8.7.1
arch           i386
os             darwin8.7.1
system         i386, darwin8.7.1
status         beta
major          2
minor          4.0
year           2006
month          09
day            20
svn rev        39433
language       R
version.string R version 2.4.0 beta (2006-09-20 r39433)

On 9/29/06, hadley wickham <h.wickham at gmail.com>
wrote:
> How can I suppress this warning?
>
> > options(warn = -10)
> > list(1,2,3,)
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>    (1, 2, 3, )
> [[1]]
> [1] 1
>
> [[2]]
> [1] 2
>
> [[3]]
> [1] 3
>
> > suppressWarnings(list(1,))
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>    (1, )
> [[1]]
> [1] 1
>
>
> And can anyone add some insight as to why this warning was added?  It
> was nice to be able to use a construction like:
>
> a <- list(
>  b = 3,
>  c = 4,
> )
>
> so when you added a new line, you could just copy and paste an existing
line.
>
> Hadley
>

Here is a kludge:

List <- function(...) {
	mc <- match.call()
	mc <- mc[as.list(mc) != ""]
	mc[[1]] <- as.name("list")
	eval(mc, parent.frame())
}

List(1,2,3,)


On 9/29/06, hadley wickham <h.wickham at gmail.com>
wrote:
> How can I suppress this warning?
>
> > options(warn = -10)
> > list(1,2,3,)
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>   (1, 2, 3, )
> [[1]]
> [1] 1
>
> [[2]]
> [1] 2
>
> [[3]]
> [1] 3
>
> > suppressWarnings(list(1,))
> Warning: a final empty element has been omitted
> the part of the args list of 'list' being evaluated was:
>   (1, )
> [[1]]
> [1] 1
>
>
> And can anyone add some insight as to why this warning was added?  It
> was nice to be able to use a construction like:
>
> a <- list(
>  b = 3,
>  c = 4,
> )
>
> so when you added a new line, you could just copy and paste an existing
line.
>
> Hadley
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>