[perl #131965] Shaped arrays can't have zero size

[Aleks-Daniel Jakimenko-Aleksejev via RT]

Indeed. The limit was introduced as a response to this ticket:
https://rt.perl.org/Ticket/Display.html?id=126800
The check is probably too aggressive, and indeed, maybe there's nothing wrong
with 0 sized arrays. I wonder what was the justification for making the check
inclusive.
On 2017-08-26 16:15:33, david.warring wrote:
> This is OK:
>
> % perl6 -e'my $size = 2; my @xref[$size,3] = ([1,2,3], [4,5,6]); say @xref'
>
> [[1 2 3] [4 5 6]]
>
> But this isn't:
>
> % perl6 -e'my $size = 0; my @xref[$size,3] = (); say @xref'
>
> Illegal dimension in shape: 0. All dimensions must be integers bigger than
> 0
> in block <unit> at -e line 1
>
> % perl6 -v
> This is Rakudo version 2017.08 built on MoarVM version 2017.08.1
> implementing Perl 6.c.
>
> Just seems an unreasonable restriction that the major shape size of an
> array can't be zero.