R devel - Oct 2011 - Pb building sets of S4 / RefClass objects with package "sets"

Hi,

does anyone know if it is possible to construct sets of S4 objects?
It seems the constructor set does not like it:

Error in as.vector(x, "character") :
  cannot coerce type 'environment' to vector of type 'character'

Regards

Johnny

PS: by the way, does anyone know where I can find some examples using the
cset class from the "sets" package, beside the one in the standard
doc?

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>>>>> "JP" == Johnny Paulo <johnny.jp.22 at
gmail.com>
>>>>>     on Fri, 7 Oct 2011 18:01:56 +0100 writes:
    > Hi, does anyone know if it is possible to construct sets
    > of S4 objects?  It seems the constructor set does not
    > like it:

    > Error in as.vector(x, "character") : cannot coerce type
    > 'environment' to vector of type 'character'

    > Regards

    > Johnny

    > PS: by the way, does anyone know where I can find some
    > examples using the cset class from the "sets" package,
    > beside the one in the standard doc?