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

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

On Fri, 20 Mar 2026, Kevin Ushey wrote:

> 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.

I have removed the 'attribute_hidden' property from these entry points
for now in r89673. I also added tools:::checkObjAPI to make it easier
fo check for non-API useage in executables linked to R. For current
R-devel and current RStudio on my mac this gives

> rs <- "/Applications/RStudio.app/Contents/Resources/app/bin/rsession-arm64"
> subset(tools:::checkObjAPI(rs), type == "F" & is.na(apitype))$name
  [1] "ATTRIB"              "BODY"                "CLOENV"
  [4] "ENCLOS"              "FORMALS"             "FRAME"
  [7] "HASHTAB"             "locale2charset"      "NAMED" 
[10] "OBJECT"              "PRCODE"              "PRENV" 
[13] "PRVALUE"             "R_findVarLocInFrame" "R_lsInternal" 
[16] "RDEBUG"              "Rf_findVar"          "Rf_findVarInFrame" 
[19] "Rf_findVarInFrame3"  "Rf_sortVector"       "SET_ENCLOS" 
[22] "SET_NAMED"           "SET_PRVALUE"         "SET_RDEBUG" 
[25] "SYMVALUE" 
> subset(tools:::checkObjAPI(rs), type == "V" & is.na(apitype))$name
[1] "R_InputHandlers"  "R_SignalHandlers" "SaveAction"

If you think some of these should be in the API you can make a case
for that.

Best,

luke

>
> Thanks,
> Kevin
>
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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
241 Schaeffer Hall                  email:   luke-tierney using uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu/