Hi,

At Fri, 20 Feb 2009 19:17:10 +0900,
Akinori MUSHA wrote in [ruby-core:22286]:
> However, there needs some more work to retain the use of
> colon in place of then/do, in order to keep backward
> compatibility, although it has been deprecated and dropped in
> 1.9.

No such syntax has been defined officially.
No backward compatibility issue.

-- 
Nobu Nakada