[Rd] [External] Re: defer removal of ENCLOS, FRAME, HASHTAB, SET_ENCLOS

[iuke-tier@ey m@iii@g oii uiow@@edu]

On Mon, 23 Mar 2026, Laurent Gautier wrote:

> Thanks Simon. This is really helpful.
>
> I did not find what is the replacement for SET_ENCLOS. The documentation
> shows how to create a new environment with a given parent environment but
> not how to reparent an existing environment (which SET_ENCLOS did).

There is no replacement; allowing this is too dangerous. See the
comments on parent.env <- in parent.env.

Best,

luke

>
> On Sun, Mar 22, 2026 at 5:00 PM Simon Urbanek <simon.urbanek using r-project.org>
> wrote:
>
>> Laurent,
>>
>> see R-exts 6.22 [1] in particular subsections 1 and 2. As for FRAME you
>> use the accessor functions instead of accessing it directly.
>>
>> Cheers,
>> Simon
>>
>> [1] -
>> https://cran.r-project.org/doc/manuals/r-devel/R-exts.html#Moving-into-C-API-compliance
>>
>>
>>> On 22 Mar 2026, at 12:00, Laurent Gautier <lgautier using gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> I'd like to second that request. rpy2, a Python-R bridge, also
>>> uses ENCLOS / SET_ENCLOS and to a lesser extent FRAME.
>>>
>>> Also, what is the alternative suggested to replace the functionality
>>> they offered?
>>>
>>>
>>> Best,
>>>
>>> Laurent
>>>
>>>
>>>
>>> Hi,
>>>>
>>>> The development version of R removes the symbols
>>>>
>>>>    ENCLOS, FRAME, HASHTAB, SET_ENCLOS
>>>>
>>>> as per r89522. Unfortunately, these symbols are used by current
>>>> versions of RStudio, and so these versions of RStudio are unable to
>>>> launch with the development versions of R. (By extension, they would
>>>> also fail to launch using R 4.6.0 when released.)
>>>>
>>>> On the RStudio side, we can work to adapt to these changes as quickly
>>>> as possible, but our experience is that users will often upgrade R
>>>> without necessarily upgrading RStudio in tandem.
>>>>
>>>> I'd like to propose keeping these symbols defined in R for now (even
>>>> if not publicly accessible via headers) just to ensure existing
>>>> versions of RStudio can continue to function as expected with the
>>>> upcoming release of R.
>>>>
>>>> Thanks,
>>>> Kevin
>>>>
>>>>
>>>
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>>>
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>>
>>
>
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-- 
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
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