On Sun, Dec 25, 2016 at 12:21 AM, Alexander Ilin <ajs...@yandex.ru> wrote:
>
> That's a very useful feature, and it seems to be there for five years! But
> why is it not described or even mentioned?
I don't know why it's not documented but it looks like an anonymous
form of UNION:. The following is equivalent:
UNION: string-or-false string POSTPONE: f ;
TUPLE: foo { name string-or-false } ;
and:
TUPLE: foo { name maybe{ string } } ;
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