From ggrothendieck at gmail.com  Fri Oct  3 17:08:52 2008
From: ggrothendieck at gmail.com (Gabor Grothendieck)
Date: Fri, 3 Oct 2008 11:08:52 -0400
Subject: [Rd] Attributes of top level environments clobbered (was Re: [R]
	possible bug in function 'var' in R 2.7.2?)
Message-ID: <971536df0810030808p5be50430sd07d0825ee422f62@mail.gmail.com>

On Fri, Oct 3, 2008 at 3:23 AM, Martin Maechler
<maechler at stat.math.ethz.ch> wrote:
> a much better (and much less error-prone) idea would be to install
> R 2.8.0 alpha  even now.
> It will become 'beta' early next week.
>
> We are asking the R community to please install and use
> pre-release versions of R  (if you can / are allowed to)
> at least from beta onwards, and report problems you see early on
> *before* the final release.

The bug discussed in the following year-old post suggested that
the problem of clobbering attributes of top level environment objects
would be fixed for 2.7 but its still in R version 2.7.2 (2008-08-25)"
and also still in  "R version 2.8.0 alpha (2008-10-01 r46589)"

   https://stat.ethz.ch/pipermail/r-devel/2007-October/047184.html

The Avoiding R Bugs section of this page:

   http://r-proto.googlecode.com

has more discussion as well as a list of some other R bugs.

This can be tested by creating a package with these two files only:

---DESCRIPTION---
Package: testlazy
Version: 1.0-0
Date: 2008-10-03
Title: Test lazy loading
Author: G Grothendieck
Maintainer: G Grothendieck <ggrothendieck at gmail.com>
Description: Test lazy loading with top level objects.
Depends: proto
LazyLoad: yes
License: GPL-2
---R/testlazy.R---
TopLevel <- proto()
---

And then testing it:

library(testlazy)
class(TopLevel)

If its class is "environment" only then the class attribute was stripped.



[Rd] Attributes of top level environments clobbered (was Re: [R] possible bug in function 'var' in R 2.7.2?)
Gabor Grothendieck