Problems with S4 methods dispatching on `...` (aka dotsMethods)

Hi Michael,

it seems that your patch to S4 generics dispatching on `...` is still
available only in R-devel, and was not included in the minor R-3.4.1
release. I was wondering what is the policy of incorporating bug fixes from
the devel branch into release, and whether there is any chance that the
broken `...` dispatch is fixed before R-3.5.0?

Cheers,
Andrzej


On Tue, Apr 25, 2017 at 4:15 PM, Andrzej Ole? <andrzej.oles at gmail.com>
wrote:

You're right, I must have mixed up my R versions when running the example,
as the problem seems to be resolved in R-devel.

Sorry for the noise and thanks again for fixing this.

Andrzej

On Tue, Apr 25, 2017 at 3:55 PM, Michael Lawrence
<lawrence.michael at gene.com> wrote:

I attempted to fix it, and that example seems to work for me. It's
also a (passing) regression test in R. Are you sure you're using a new
enough R-devel?


On Tue, Apr 25, 2017 at 2:34 AM, Andrzej Ole? <andrzej.oles at gmail.com>
wrote:

Hi Michael,

thanks again for your patch! I've tested it and I'm happy to confirm
that
`callNextMethod()` works with methods dispatching on `...`.

However, the second issue I reported still seems to be unresolved.
Consider
the following toy example, where the `f()` calls differ in result
depending
on whether the dispatch happens on a formal argument or the `...`
argument.


    f = function(x, ..., a = b) {
      b = "missing 'a'"
      print(a)
    }

    f()
    ## [1] missing 'a'

    f(a = 1)
    ## [1] 1

    setGeneric("f", signature = "x")

    # works as the non-generic version
    f()
    ## [1] missing 'a'

    setGeneric("f", signature = "...")

    # unexpectedly fails to find 'b'
    f()
    ## Error in print(a) : object 'b' not found


Any chances of fixing this?

Cheers,
Andrzej



On Fri, Apr 21, 2017 at 11:40 AM, Andrzej Ole? <andrzej.oles at gmail.com>
wrote:

Great, thanks Michael for you quick response!

I started off with a question on SO because I was not sure whether
this
was an actual bug or I was just missing something obvious. I'm looking
forward to the patch.

Cheers,
Andrzej


On Thu, Apr 20, 2017 at 10:28 PM, Michael Lawrence
<lawrence.michael at gene.com> wrote:

Thanks for pointing out these issues. I have a fix that I will commit
soon.

Btw, I would never have seen the post on Stack Overflow. It's best to
report bugs on the bugzilla.

Michael

On Thu, Apr 20, 2017 at 8:30 AM, Andrzej Ole?
<andrzej.oles at gmail.com>
wrote:

Hi all,

I recently encountered some unexpected behavior with S4 generics
dispatching on `...`, which I described in


http://stackoverflow.com/questions/43499203/use-callnextmethod-with-dotsmethods

TL;DR: `callNextMethod()` doesn't work in methods dispatching on
`...`,
and
arguments of such methods are resolved differently than the
arguments
of
methods dispatching on formal arguments.

Could this indicate a potential problem with the implementation of
the
`...` dispatch?

Cheers,
Andrzej

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