Pfaff, Bernhard Dr. wrote:
> Dear R-Devel subscriber,
>
> first, let me express my thank to the R-Core team for the new release! I
> appreciate their efforts and time spent to enhance R.
> In accordance with the 'NEWS' file (see excerpt of it below),
>
> [...
> o Changed the environment tree to be rooted in an empty
> environment, available as emptyenv(). baseenv() has been
> modified to return an environment with emptyenv() as parent,
> rather than NULL.
>
> ...
>
> o Use of NULL as an environment is deprecated and gives a warning.
> ...]
>
> I detected the warning message as announced for a couple of contributed
> packages, e.g.
>
> library(ape)
> library(car)
> library(chron)
> library(urca)
>
> Now, I am wondering what would be a suitable/elegant way to fix the
> packages' code such that the warning does not appear any longer. I am
> adressing this question to R-devel, because this might also be of
> interest for other package mainatiners.
If you are a maintainer of a package getting this warning, then you
should replace all uses of NULL as an environment by baseenv() (to get
the previous behaviour), or emptyenv() (if you thought env=NULL gave you
an empty environment).
There's really not much a non-maintainer can do about this warning.
Duncan Murdoch
>
> Many thanks in advance for any hints and pointers.
>
> Regards,
> Bernhard
>
>
>
>
> Dr. Bernhard Pfaff
> Global Structured Products Group
> (Europe)
>
> Invesco Asset Management Deutschland GmbH
> Bleichstrasse 60-62
> D-60313 Frankfurt am Main
>
> Tel: +49(0)69 298 07230
> Fax: +49(0)69 298 07178
> Email: [EMAIL PROTECTED]
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>
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