On 06/02/2013 11:54 PM, John Cowan wrote:
> Arthur A. Gleckler scripsit:
>> John, have you already done one of your comprehensive surveys of existing
>> implementations?  I'd love to compare the proposal to what's already
>> available.
>
> There isn't much.  R6RS enumerations, Racket sets, and three Chicken
> eggs: `sets`, `cis`, and `iset`.  Links are in the proposal,

Kawa has enumerations:

http://www.gnu.org/software/kawa/Enumerations.html

These are basically Java enumerations, using distinct
enumeration objects, rather than symbols.

More here, including pros and cons:

http://lists.scheme-reports.org/pipermail/scheme-reports/2013-May/003511.html
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