RE: test for shy-group "feature"?

["Drew Adams" <drew.adams@oracle.com>]

    >Emacs 22 has shy groups for regexps; previous versions did not.
    >
    >When writing conditional code that tries to work with multiple Emacs
    >versions, it is usually better to test fboundp, boundp, or
    >featurep, than it
    >is to test the major version. I couldn't find any function,
    >variable, or
    >feature associated with this new "feature", shy groups. Is
    >there one that I
    >might have missed? Thanks.

    My guess is that you will find no updates on the elisp level that are
    tied to shy regexp groups. But I am not sure.

There are elisp updates (e.g. in regexpt-opt), but I couldn't find any new
function, variable, or feature definitions.