Test for `save-abbrevs' improvement

[Juanma Barranquero <lekktu@gmail.com>]

Often it is said here that it is best to check for features, and not
for specific Emacs versions.

What about changes to allowed values for a variable?

`save-abbrevs' now accepts the value `silently', but that feature has
neither new variables nor functions to test for. And I don't want to
simply set `save-abbrevs' to `silently' because then, 21.1 asks me
every time about saving the abbreviations.

What would be the wisest way to check for it?

  (string-match "`silently'"
                (documentation-property 'save-abbrevs
                                        'variable-documentation))

seems hardly elegant...

--
                    /L/e/k/t/u