From p.dalgaard@kubism.ku.dk  Fri Sep 12 11:46:35 1997
From: p.dalgaard@kubism.ku.dk (Peter Dalgaard BSA)
Date: 12 Sep 1997 12:46:35 +0200
Subject: R-alpha: bug in passing of empty  (...)
In-Reply-To: Martin Maechler's message of Fri, 12 Sep 1997 12:09:08 +0200
References: <199709121009.MAA01186@sophie.ethz.ch>
Message-ID: <x2wwkmstbo.fsf@bush.kubism.ku.dk>

Martin Maechler <maechler@stat.math.ethz.ch> writes:

> 
> This is too bad (and an old bug at least since 0.49); 
> it also breaks some code I have been using in S-plus:
> 
> > tst <- function(...) ls(...)
> 
> > tst()#--- should really give the same as ls() !!
> character(0)
> 
> > ls()
>   [1] "%in%"                   "As.integer"             "Dir"                   
>   [4] "Dir0"                   "Fn12"                   "Slynx"                 
>   ......

I don't know whether it's a bug or a feature, but it has nothing to do
with (...)

> tst<-function()ls()
> tst()
character(0)
> ls()
 [1] "NextMethod" "airquality" "dig"        "grid"       "l"         
 [6] "tst"        "umach"      "x"          "xmin"       "y"         
[11] "z"          ""       
> tst<-function(...){x<-5;ls(...)}  
> tst()
[1] "x"
> tst<-function(){x<-5;ls()}
> tst()
[1] "x"

I'm rather suspecting that pos=-1 in the argument list to ls should
have been pos=1. Anyone have the big picture on pos and envir?

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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R-alpha: bug in passing of empty (...)
Peter Dalgaard BSA