That's not helping. What didn't you understand? Are you still expecting
that it is words() that must know all the details of what a list is,
because a list can't know what itself is?
On Wed, Sep 26, 2018 at 10:09 PM ToddAndMargo <toddandma...@zoho.com> wrote:
> On 9/26/18 7:04 PM, Brandon Allbery wrote:
> > It doesn't. It just improves error messages.
> >
> > words() produces a list-like thing; that's what really matters, because
> > list-like things do the Positional role. Declaring it up front lets Perl
> > 6 give you an error message early if you use the result in the wrong way
> > or if the actual implementation of words() doesn't produce something
> > that does the Positional role.
> >
> > pyanfar Z$ 6 'say (sub { [5] })()[0]'
> > 5
> >
> > I didn't declare the anonymous sub as producing a Positional; it just
> > returns a List. I then invoke it with (), and apply [] to the resulting
> > List. It's the fact that it produced a List that matters; any List or
> > Seq or Array or Buf, etc. can be []-ed,because they all do the
> > Positional role that defines [].
>
> Uhhh okay.
>
--
brandon s allbery kf8nh
allber...@gmail.com
