new.env does not recognize parents from subclassesof "environment"

-----Original Message-----
From: r-devel-bounces at r-project.org 
[mailto:r-devel-bounces at r-project.org] On Behalf Of Vitally S.
Sent: Thursday, October 21, 2010 9:00 AM
To: John Chambers
Cc: r-devel at r-project.org
Subject: Re: [Rd] new.env does not recognize parents from 
subclassesof "environment"



Here is an infinite recursion error  which occurs only with S4
subclasses assignment.

 setClass("myenv", contains = "environment")
#[1] "myenv"
 env <- new("myenv")
 env[[".me"]] <- env at .xData
#Error: evaluation nested too deeply: infinite recursion / 
options(expressions=)?
 

With basic types it works as expected:

env1 <- new.env()
env1[[".me"]] <- env1

May be this is related to active bindings that you mentioned, 
 but I am still
reporting it here.

Vitally.

 Thanks for the report.  Should now be fixed in r-devel and 

2.12 patched (rev 53383).

Please do report any cases where a subclass of environment 

doesn't work.  There are some known cases in locking and

active binding, that will be fixed in due course.

The workaround for any such problem is usually as.environment().

On 10/20/10 3:17 AM, Vitaly S. wrote:

Dear Developers,

A lot has been changed in the R12.0 with respect to 

behavior of "environment"

subclasses.  Many thanks for that.

One small irregularity, though; new.env does not allow the 

parent to be from S4

subclass.

setClass("myenv", contains="environment")

[1] "myenv"

new.env(parent=new("myenv"))

Error in new.env(parent = new("myenv")) : 'enclos' must be 

an environment

I wonder if this is a "planed" behavior.

The use of .xData  slot obviously works:

new.env(parent=new("myenv")@.xData)

<environment: 063bb9e8>
Thanks,
Vitaly.